- 09 5月, 2018 4 次提交
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由 Christoph Hellwig 提交于
Define this symbol if the architecture either uses 64-bit pointers or the PHYS_ADDR_T_64BIT is set. This covers 95% of the old arch magic. We only need an additional select for Xen on ARM (why anyway?), and we now always set ARCH_DMA_ADDR_T_64BIT on mips boards with 64-bit physical addressing instead of only doing it when highmem is set. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NJames Hogan <jhogan@kernel.org>
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由 Christoph Hellwig 提交于
This way we have one central definition of it, and user can select it as needed. Note that we now also always select it when CONFIG_DMA_API_DEBUG is select, which fixes some incorrect checks in a few network drivers. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NAnshuman Khandual <khandual@linux.vnet.ibm.com>
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由 Christoph Hellwig 提交于
This way we have one central definition of it, and user can select it as needed. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NAnshuman Khandual <khandual@linux.vnet.ibm.com>
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由 Christoph Hellwig 提交于
This way we have one central definition of it, and user can select it as needed. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NAnshuman Khandual <khandual@linux.vnet.ibm.com>
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- 22 3月, 2018 1 次提交
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由 Zhichang Yuan 提交于
41f8bba7 ("of/pci: Add pci_register_io_range() and pci_pio_to_address()") added support for PCI I/O space mapped into CPU physical memory space. With that support, the I/O ranges configured for PCI/PCIe hosts on some architectures can be mapped to logical PIO and converted easily between CPU address and the corresponding logical PIO. Based on this, PCI I/O port space can be accessed via in/out accessors that use memory read/write. But on some platforms, there are bus hosts that access I/O port space with host-local I/O port addresses rather than memory addresses. Add a more generic I/O mapping method to support those devices. With this patch, both the CPU addresses and the host-local port can be mapped into the logical PIO space with different logical/fake PIOs. After this, all the I/O accesses to either PCI MMIO devices or host-local I/O peripherals can be unified into the existing I/O accessors defined in asm-generic/io.h and be redirected to the right device-specific hooks based on the input logical PIO. Tested-by: Ndann frazier <dann.frazier@canonical.com> Signed-off-by: NZhichang Yuan <yuanzhichang@hisilicon.com> Signed-off-by: NGabriele Paoloni <gabriele.paoloni@huawei.com> Signed-off-by: NJohn Garry <john.garry@huawei.com> [bhelgaas: remove -EFAULT return from logic_pio_register_range() per https://lkml.kernel.org/r/20180403143909.GA21171@ulmo, fix NULL pointer checking per https://lkml.kernel.org/r/20180403211505.GA29612@embeddedor.com] Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
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- 15 1月, 2018 1 次提交
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由 Christoph Hellwig 提交于
The trivial direct mapping implementation already does a virtual to physical translation which isn't strictly a noop, and will soon learn to do non-direct but linear physical to dma translations through the device offset and a few small tricks. Rename it to a better fitting name. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NVladimir Murzin <vladimir.murzin@arm.com>
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- 07 1月, 2018 1 次提交
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由 Bart Van Assche 提交于
Many kernel drivers contain code that allocates and frees both a scatterlist and the pages that populate that scatterlist. Introduce functions in lib/scatterlist.c that perform these tasks instead of duplicating this functionality in multiple drivers. Only include these functions in the build if CONFIG_SGL_ALLOC=y to avoid that the kernel size increases if this functionality is not used. Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com> Reviewed-by: NHannes Reinecke <hare@suse.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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- 18 11月, 2017 1 次提交
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由 Geert Uytterhoeven 提交于
Extract the string test code into its own source file, to allow compiling it either to a loadable module, or built into the kernel. Fixes: 03270c13 ("lib/string.c: add testcases for memset16/32/64") Link: http://lkml.kernel.org/r/1505397744-3387-1-git-send-email-geert@linux-m68k.orgSigned-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 11月, 2017 1 次提交
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由 Rob Herring 提交于
The GENERIC_IO option is set for every architecture except tile and score as those define NO_IOMEM. The option only controls visibility of CONFIG_MTD which doesn't appear to be necessary for any reason, so let's just remove GENERIC_IO. Signed-off-by: NRob Herring <robh@kernel.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Boris Brezillon <boris.brezillon@free-electrons.com> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr> Cc: user-mode-linux-devel@lists.sourceforge.net Cc: user-mode-linux-user@lists.sourceforge.net Cc: linux-mtd@lists.infradead.org Acked-by: NRichard Weinberger <richard@nod.at> Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: NRichard Weinberger <richard@nod.at>
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- 26 9月, 2017 1 次提交
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由 Palmer Dabbelt 提交于
Many ports (m32r, microblaze, mips, parisc, score, and sparc) use functionally identical copies of various GCC library routine files, which came up as we were submitting the RISC-V port (which also uses some of these). This patch adds a new copy of these library routine files, which are functionally identical to the various other copies. These are availiable via Kconfig as CONFIG_GENERIC_$ROUTINE, which currently isn't used anywhere. Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NPalmer Dabbelt <palmer@dabbelt.com>
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- 09 9月, 2017 1 次提交
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由 Matthew Wilcox 提交于
[akpm@linux-foundation.org: minor tweaks] Link: http://lkml.kernel.org/r/20170720184539.31609-3-willy@infradead.orgSigned-off-by: NMatthew Wilcox <mawilcox@microsoft.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: David Miller <davem@davemloft.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Minchan Kim <minchan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 01 9月, 2017 1 次提交
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由 Robin Murphy 提交于
mmio_flush_range() suffers from a lack of clearly-defined semantics, and is somewhat ambiguous to port to other architectures where the scope of the writeback implied by "flush" and ordering might matter, but MMIO would tend to imply non-cacheable anyway. Per the rationale in 67a3e8fe ("nd_blk: change aperture mapping from WC to WB"), the only existing use is actually to invalidate clean cache lines for ARCH_MEMREMAP_PMEM type mappings *without* writeback. Since the recent cleanup of the pmem API, that also now happens to be the exact purpose of arch_invalidate_pmem(), which would be a far more well-defined tool for the job. Rather than risk potentially inconsistent implementations of mmio_flush_range() for the sake of one callsite, streamline things by removing it entirely and instead move the ARCH_MEMREMAP_PMEM related definitions up to the libnvdimm level, so they can be shared by NFIT as well. This allows NFIT to be enabled for arm64. Signed-off-by: NRobin Murphy <robin.murphy@arm.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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- 16 8月, 2017 2 次提交
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由 Nick Terrell 提交于
Add zstd compression and decompression kernel modules. zstd offers a wide varity of compression speed and quality trade-offs. It can compress at speeds approaching lz4, and quality approaching lzma. zstd decompressions at speeds more than twice as fast as zlib, and decompression speed remains roughly the same across all compression levels. The code was ported from the upstream zstd source repository. The `linux/zstd.h` header was modified to match linux kernel style. The cross-platform and allocation code was stripped out. Instead zstd requires the caller to pass a preallocated workspace. The source files were clang-formatted [1] to match the Linux Kernel style as much as possible. Otherwise, the code was unmodified. We would like to avoid as much further manual modification to the source code as possible, so it will be easier to keep the kernel zstd up to date. I benchmarked zstd compression as a special character device. I ran zstd and zlib compression at several levels, as well as performing no compression, which measure the time spent copying the data to kernel space. Data is passed to the compresser 4096 B at a time. The benchmark file is located in the upstream zstd source repository under `contrib/linux-kernel/zstd_compress_test.c` [2]. I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM. The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor, 16 GB of RAM, and a SSD. I benchmarked using `silesia.tar` [3], which is 211,988,480 B large. Run the following commands for the benchmark: sudo modprobe zstd_compress_test sudo mknod zstd_compress_test c 245 0 sudo cp silesia.tar zstd_compress_test The time is reported by the time of the userland `cp`. The MB/s is computed with 1,536,217,008 B / time(buffer size, hash) which includes the time to copy from userland. The Adjusted MB/s is computed with 1,536,217,088 B / (time(buffer size, hash) - time(buffer size, none)). The memory reported is the amount of memory the compressor requests. | Method | Size (B) | Time (s) | Ratio | MB/s | Adj MB/s | Mem (MB) | |----------|----------|----------|-------|---------|----------|----------| | none | 11988480 | 0.100 | 1 | 2119.88 | - | - | | zstd -1 | 73645762 | 1.044 | 2.878 | 203.05 | 224.56 | 1.23 | | zstd -3 | 66988878 | 1.761 | 3.165 | 120.38 | 127.63 | 2.47 | | zstd -5 | 65001259 | 2.563 | 3.261 | 82.71 | 86.07 | 2.86 | | zstd -10 | 60165346 | 13.242 | 3.523 | 16.01 | 16.13 | 13.22 | | zstd -15 | 58009756 | 47.601 | 3.654 | 4.45 | 4.46 | 21.61 | | zstd -19 | 54014593 | 102.835 | 3.925 | 2.06 | 2.06 | 60.15 | | zlib -1 | 77260026 | 2.895 | 2.744 | 73.23 | 75.85 | 0.27 | | zlib -3 | 72972206 | 4.116 | 2.905 | 51.50 | 52.79 | 0.27 | | zlib -6 | 68190360 | 9.633 | 3.109 | 22.01 | 22.24 | 0.27 | | zlib -9 | 67613382 | 22.554 | 3.135 | 9.40 | 9.44 | 0.27 | I benchmarked zstd decompression using the same method on the same machine. The benchmark file is located in the upstream zstd repo under `contrib/linux-kernel/zstd_decompress_test.c` [4]. The memory reported is the amount of memory required to decompress data compressed with the given compression level. If you know the maximum size of your input, you can reduce the memory usage of decompression irrespective of the compression level. | Method | Time (s) | MB/s | Adjusted MB/s | Memory (MB) | |----------|----------|---------|---------------|-------------| | none | 0.025 | 8479.54 | - | - | | zstd -1 | 0.358 | 592.15 | 636.60 | 0.84 | | zstd -3 | 0.396 | 535.32 | 571.40 | 1.46 | | zstd -5 | 0.396 | 535.32 | 571.40 | 1.46 | | zstd -10 | 0.374 | 566.81 | 607.42 | 2.51 | | zstd -15 | 0.379 | 559.34 | 598.84 | 4.61 | | zstd -19 | 0.412 | 514.54 | 547.77 | 8.80 | | zlib -1 | 0.940 | 225.52 | 231.68 | 0.04 | | zlib -3 | 0.883 | 240.08 | 247.07 | 0.04 | | zlib -6 | 0.844 | 251.17 | 258.84 | 0.04 | | zlib -9 | 0.837 | 253.27 | 287.64 | 0.04 | Tested in userland using the test-suite in the zstd repo under `contrib/linux-kernel/test/UserlandTest.cpp` [5] by mocking the kernel functions. Fuzz tested using libfuzzer [6] with the fuzz harnesses under `contrib/linux-kernel/test/{RoundTripCrash.c,DecompressCrash.c}` [7] [8] with ASAN, UBSAN, and MSAN. Additionaly, it was tested while testing the BtrFS and SquashFS patches coming next. [1] https://clang.llvm.org/docs/ClangFormat.html [2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/zstd_compress_test.c [3] http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia [4] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/zstd_decompress_test.c [5] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/UserlandTest.cpp [6] http://llvm.org/docs/LibFuzzer.html [7] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/RoundTripCrash.c [8] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/DecompressCrash.c zstd source repository: https://github.com/facebook/zstdSigned-off-by: NNick Terrell <terrelln@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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由 Nick Terrell 提交于
Adds xxhash kernel module with xxh32 and xxh64 hashes. xxhash is an extremely fast non-cryptographic hash algorithm for checksumming. The zstd compression and decompression modules added in the next patch require xxhash. I extracted it out from zstd since it is useful on its own. I copied the code from the upstream XXHash source repository and translated it into kernel style. I ran benchmarks and tests in the kernel and tests in userland. I benchmarked xxhash as a special character device. I ran in four modes, no-op, xxh32, xxh64, and crc32. The no-op mode simply copies the data to kernel space and ignores it. The xxh32, xxh64, and crc32 modes compute hashes on the copied data. I also ran it with four different buffer sizes. The benchmark file is located in the upstream zstd source repository under `contrib/linux-kernel/xxhash_test.c` [1]. I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM. The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor, 16 GB of RAM, and a SSD. I benchmarked using the file `filesystem.squashfs` from `ubuntu-16.10-desktop-amd64.iso`, which is 1,536,217,088 B large. Run the following commands for the benchmark: modprobe xxhash_test mknod xxhash_test c 245 0 time cp filesystem.squashfs xxhash_test The time is reported by the time of the userland `cp`. The GB/s is computed with 1,536,217,008 B / time(buffer size, hash) which includes the time to copy from userland. The Normalized GB/s is computed with 1,536,217,088 B / (time(buffer size, hash) - time(buffer size, none)). | Buffer Size (B) | Hash | Time (s) | GB/s | Adjusted GB/s | |-----------------|-------|----------|------|---------------| | 1024 | none | 0.408 | 3.77 | - | | 1024 | xxh32 | 0.649 | 2.37 | 6.37 | | 1024 | xxh64 | 0.542 | 2.83 | 11.46 | | 1024 | crc32 | 1.290 | 1.19 | 1.74 | | 4096 | none | 0.380 | 4.04 | - | | 4096 | xxh32 | 0.645 | 2.38 | 5.79 | | 4096 | xxh64 | 0.500 | 3.07 | 12.80 | | 4096 | crc32 | 1.168 | 1.32 | 1.95 | | 8192 | none | 0.351 | 4.38 | - | | 8192 | xxh32 | 0.614 | 2.50 | 5.84 | | 8192 | xxh64 | 0.464 | 3.31 | 13.60 | | 8192 | crc32 | 1.163 | 1.32 | 1.89 | | 16384 | none | 0.346 | 4.43 | - | | 16384 | xxh32 | 0.590 | 2.60 | 6.30 | | 16384 | xxh64 | 0.466 | 3.30 | 12.80 | | 16384 | crc32 | 1.183 | 1.30 | 1.84 | Tested in userland using the test-suite in the zstd repo under `contrib/linux-kernel/test/XXHashUserlandTest.cpp` [2] by mocking the kernel functions. A line in each branch of every function in `xxhash.c` was commented out to ensure that the test-suite fails. Additionally tested while testing zstd and with SMHasher [3]. [1] https://phabricator.intern.facebook.com/P57526246 [2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/XXHashUserlandTest.cpp [3] https://github.com/aappleby/smhasher zstd source repository: https://github.com/facebook/zstd XXHash source repository: https://github.com/cyan4973/xxhashSigned-off-by: NNick Terrell <terrelln@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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- 10 6月, 2017 1 次提交
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由 Dan Williams 提交于
The pmem driver has a need to transfer data with a persistent memory destination and be able to rely on the fact that the destination writes are not cached. It is sufficient for the writes to be flushed to a cpu-store-buffer (non-temporal / "movnt" in x86 terms), as we expect userspace to call fsync() to ensure data-writes have reached a power-fail-safe zone in the platform. The fsync() triggers a REQ_FUA or REQ_FLUSH to the pmem driver which will turn around and fence previous writes with an "sfence". Implement a __copy_from_user_inatomic_flushcache, memcpy_page_flushcache, and memcpy_flushcache, that guarantee that the destination buffer is not dirty in the cpu cache on completion. The new copy_from_iter_flushcache and sub-routines will be used to replace the "pmem api" (include/linux/pmem.h + arch/x86/include/asm/pmem.h). The availability of copy_from_iter_flushcache() and memcpy_flushcache() are gated by the CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE config symbol, and fallback to copy_from_iter_nocache() and plain memcpy() otherwise. This is meant to satisfy the concern from Linus that if a driver wants to do something beyond the normal nocache semantics it should be something private to that driver [1], and Al's concern that anything uaccess related belongs with the rest of the uaccess code [2]. The first consumer of this interface is a new 'copy_from_iter' dax operation so that pmem can inject cache maintenance operations without imposing this overhead on other dax-capable drivers. [1]: https://lists.01.org/pipermail/linux-nvdimm/2017-January/008364.html [2]: https://lists.01.org/pipermail/linux-nvdimm/2017-April/009942.html Cc: <x86@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Matthew Wilcox <mawilcox@microsoft.com> Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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- 09 6月, 2017 1 次提交
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由 Jeremy Kerr 提交于
Add a little helper for crc4 calculations. This works 4-bits-at-a-time, using a simple table approach. We will need this in the FSI core code, as well as any master implementations that need to calculate CRCs in software. Signed-off-by: NJeremy Kerr <jk@ozlabs.org> Signed-off-by: NChris Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: NJoel Stanley <joel@jms.id.au> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 27 2月, 2017 1 次提交
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由 Geert Uytterhoeven 提交于
This allows to enable and run the accompanying test (test_parman) without dependencies on other users of parman. Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 25 2月, 2017 2 次提交
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由 Geert Uytterhoeven 提交于
Extract the glob test code into its own source file, to allow to compile it either to a loadable module, or builtin into the kernel. Link: http://lkml.kernel.org/r/1483470276-10517-2-git-send-email-geert@linux-m68k.orgSigned-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Geert Uytterhoeven 提交于
Extract the crc32 test code into its own source file, to allow to compile it either to a loadable module, or builtin into the kernel. Link: http://lkml.kernel.org/r/1483470276-10517-1-git-send-email-geert@linux-m68k.orgSigned-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 24 2月, 2017 1 次提交
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由 Dave Airlie 提交于
Linus doesn't like it user selectable, so kill it until someone needs it for something else. Signed-off-by: NDave Airlie <airlied@redhat.com>
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- 23 2月, 2017 1 次提交
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由 Jiri Pirko 提交于
As reported by Geert, remove the string so the user does not see this config option. The option is explicitly selected only as a dependency of in-kernel users. Reported-by: NGeert Uytterhoeven <geert@linux-m68k.org> Fixes: 44091d29 ("lib: Introduce priority array area manager") Signed-off-by: NJiri Pirko <jiri@mellanox.com> Tested-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 04 2月, 2017 1 次提交
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由 Jiri Pirko 提交于
This introduces a infrastructure for management of linear priority areas. Priority order in an array matters, however order of items inside a priority group does not matter. As an initial implementation, L-sort algorithm is used. It is quite trivial. More advanced algorithm called P-sort will be introduced as a follow-up. The infrastructure is prepared for other algos. Alongside this, a testing module is introduced as well. Signed-off-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 25 1月, 2017 2 次提交
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由 Bart Van Assche 提交于
Several RDMA drivers (hfi1, qib and rxe) expect that ib_sge.addr is a virtual address. Provide DMA mapping operations that are suitable for these drivers. Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Joerg Roedel <jroedel@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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由 Bart Van Assche 提交于
Reduce the kernel size by only building dma_noop_ops for those architectures that actually use it. This was suggested by Christoph Hellwig. Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Joerg Roedel <jroedel@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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- 27 12月, 2016 1 次提交
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由 Chris Wilson 提交于
Prime numbers are interesting for testing components that use multiplies and divides, such as testing DRM's struct drm_mm alignment computations. v2: Move to lib/, add selftest v3: Fix initial constants (exclude 0/1 from being primes) v4: More RCU markup to keep 0day/sparse happy v5: Fix RCU unwind on module exit, add to kselftests v6: Tidy computation of bitmap size v7: for_each_prime_number_from() v8: Compose small-primes using BIT() for easier verification v9: Move rcu dance entirely into callers. v10: Improve quote for Betrand's Postulate (aka Chebyshev's theorem) Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Lukas Wunner <lukas@wunner.de> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222144514.3911-1-chris@chris-wilson.co.uk
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- 08 10月, 2016 1 次提交
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由 Vineet Gupta 提交于
This came to light when implementing native 64-bit atomics for ARCv2. The atomic64 self-test code uses CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE to check whether atomic64_dec_if_positive() is available. It seems it was needed when not every arch defined it. However as of current code the Kconfig option seems needless - for CONFIG_GENERIC_ATOMIC64 it is auto-enabled in lib/Kconfig and a generic definition of API is present lib/atomic64.c - arches with native 64-bit atomics select it in arch/*/Kconfig and define the API in their headers So I see no point in keeping the Kconfig option Compile tested for: - blackfin (CONFIG_GENERIC_ATOMIC64) - x86 (!CONFIG_GENERIC_ATOMIC64) - ia64 Link: http://lkml.kernel.org/r/1473703083-8625-3-git-send-email-vgupta@synopsys.comSigned-off-by: NVineet Gupta <vgupta@synopsys.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ming Lin <ming.l@ssi.samsung.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@suse.de> Cc: Andi Kleen <ak@linux.intel.com> Cc: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 17 9月, 2016 1 次提交
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由 Omar Sandoval 提交于
This is a generally useful data structure, so make it available to anyone else who might want to use it. It's also a nice cleanup separating the allocation logic from the rest of the tag handling logic. The code is behind a new Kconfig option, CONFIG_SBITMAP, which is only selected by CONFIG_BLOCK for now. This should be a complete noop functionality-wise. Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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- 21 5月, 2016 1 次提交
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由 Matthew Wilcox 提交于
I've been receiving increasingly concerned notes from 0day about how much my recent changes have been bloating the radix tree. Make it happier by only including multiorder support if CONFIG_TRANSPARENT_HUGEPAGES is set. This is an independent Kconfig option, so other radix tree users can also set it if they have a need. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com> Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 16 4月, 2016 1 次提交
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由 Ming Lin 提交于
Now it's ready to move the mempool based SG chained allocator code from SCSI driver to lib/sg_pool.c, which will be compiled only based on a Kconfig symbol CONFIG_SG_POOL. SCSI selects CONFIG_SG_POOL. Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMing Lin <ming.l@ssi.samsung.com> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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- 26 3月, 2016 1 次提交
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由 Alexander Potapenko 提交于
Implement the stack depot and provide CONFIG_STACKDEPOT. Stack depot will allow KASAN store allocation/deallocation stack traces for memory chunks. The stack traces are stored in a hash table and referenced by handles which reside in the kasan_alloc_meta and kasan_free_meta structures in the allocated memory chunks. IRQ stack traces are cut below the IRQ entry point to avoid unnecessary duplication. Right now stackdepot support is only enabled in SLAB allocator. Once KASAN features in SLAB are on par with those in SLUB we can switch SLUB to stackdepot as well, thus removing the dependency on SLUB stack bookkeeping, which wastes a lot of memory. This patch is based on the "mm: kasan: stack depots" patch originally prepared by Dmitry Chernenkov. Joonsoo has said that he plans to reuse the stackdepot code for the mm/page_owner.c debugging facility. [akpm@linux-foundation.org: s/depot_stack_handle/depot_stack_handle_t] [aryabinin@virtuozzo.com: comment style fixes] Signed-off-by: NAlexander Potapenko <glider@google.com> Signed-off-by: NAndrey Ryabinin <aryabinin@virtuozzo.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Andrey Konovalov <adech.fo@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Konstantin Serebryany <kcc@google.com> Cc: Dmitry Chernenkov <dmitryc@google.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 18 1月, 2016 1 次提交
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由 Arnd Bergmann 提交于
The sw842 library code was merged in linux-4.1 and causes a very rare randconfig failure when CONFIG_CRC32 is not set: lib/built-in.o: In function `sw842_compress': oid_registry.c:(.text+0x12ddc): undefined reference to `crc32_be' lib/built-in.o: In function `sw842_decompress': oid_registry.c:(.text+0x137e4): undefined reference to `crc32_be' This adds an explict 'select CRC32' statement, similar to what the other users of the crc32 code have. In practice, CRC32 is always enabled anyway because over 100 other symbols select it. Cc: stable@vger.kernel.org Signed-off-by: NArnd Bergmann <arnd@arndb.de> Fixes: 2da572c9 ("lib: add software 842 compression/decompression") Acked-by: NDan Streetman <ddstreet@ieee.org> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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- 12 12月, 2015 1 次提交
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由 Christoph Hellwig 提交于
The new name is irq_poll as iopoll is already taken. Better suggestions welcome. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NBart Van Assche <bart.vanassche@sandisk.com>
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- 08 12月, 2015 1 次提交
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由 Geert Uytterhoeven 提交于
Spelling s/heler/helper/, grammar s/channel/channels/ Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 17 10月, 2015 1 次提交
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由 Andrew Morton 提交于
lib/built-in.o: In function `__bitrev32': deftree.c:(.text+0x1e799): undefined reference to `byte_rev_table' deftree.c:(.text+0x1e7a0): undefined reference to `byte_rev_table' deftree.c:(.text+0x1e7b4): undefined reference to `byte_rev_table' deftree.c:(.text+0x1e7c1): undefined reference to `byte_rev_table' Anything which uses bitrevX() has to select BITREVERSE, to grab lib/bitrev.o. Reported-by: NJim Davis <jim.epost@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 28 8月, 2015 1 次提交
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由 Ross Zwisler 提交于
This should result in a pretty sizeable performance gain for reads. For rough comparison I did some simple read testing using PMEM to compare reads of write combining (WC) mappings vs write-back (WB). This was done on a random lab machine. PMEM reads from a write combining mapping: # dd of=/dev/null if=/dev/pmem0 bs=4096 count=100000 100000+0 records in 100000+0 records out 409600000 bytes (410 MB) copied, 9.2855 s, 44.1 MB/s PMEM reads from a write-back mapping: # dd of=/dev/null if=/dev/pmem0 bs=4096 count=1000000 1000000+0 records in 1000000+0 records out 4096000000 bytes (4.1 GB) copied, 3.44034 s, 1.2 GB/s To be able to safely support a write-back aperture I needed to add support for the "read flush" _DSM flag, as outlined in the DSM spec: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf This flag tells the ND BLK driver that it needs to flush the cache lines associated with the aperture after the aperture is moved but before any new data is read. This ensures that any stale cache lines from the previous contents of the aperture will be discarded from the processor cache, and the new data will be read properly from the DIMM. We know that the cache lines are clean and will be discarded without any writeback because either a) the previous aperture operation was a read, and we never modified the contents of the aperture, or b) the previous aperture operation was a write and we must have written back the dirtied contents of the aperture to the DIMM before the I/O was completed. In order to add support for the "read flush" flag I needed to add a generic routine to invalidate cache lines, mmio_flush_range(). This is protected by the ARCH_HAS_MMIO_FLUSH Kconfig variable, and is currently only supported on x86. Signed-off-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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- 25 8月, 2015 1 次提交
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由 Robert Jarzmik 提交于
Sometimes a scatter-gather has to be split into several chunks, or sub scatter lists. This happens for example if a scatter list will be handled by multiple DMA channels, each one filling a part of it. A concrete example comes with the media V4L2 API, where the scatter list is allocated from userspace to hold an image, regardless of the knowledge of how many DMAs will fill it : - in a simple RGB565 case, one DMA will pump data from the camera ISP to memory - in the trickier YUV422 case, 3 DMAs will pump data from the camera ISP pipes, one for pipe Y, one for pipe U and one for pipe V For these cases, it is necessary to split the original scatter list into multiple scatter lists, which is the purpose of this patch. The guarantees that are required for this patch are : - the intersection of spans of any couple of resulting scatter lists is empty. - the union of spans of all resulting scatter lists is a subrange of the span of the original scatter list. - streaming DMA API operations (mapping, unmapping) should not happen both on both the resulting and the original scatter list. It's either the first or the later ones. - the caller is reponsible to call kfree() on the resulting scatterlists. Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: NJens Axboe <axboe@fb.com>
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- 21 8月, 2015 1 次提交
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由 Johannes Berg 提交于
Since all users are now converted to the inline implementation, remove the out-of-line implementation entirely. Signed-off-by: NJohannes Berg <johannes.berg@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 15 8月, 2015 1 次提交
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由 Oleg Nesterov 提交于
Remove CONFIG_PERCPU_RWSEM, the next patch adds the unconditional user of percpu_rw_semaphore. Signed-off-by: NOleg Nesterov <oleg@redhat.com>
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- 26 6月, 2015 1 次提交
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由 Ross Zwisler 提交于
Based on an original patch by Ross Zwisler [1]. Writes to persistent memory have the potential to be posted to cpu cache, cpu write buffers, and platform write buffers (memory controller) before being committed to persistent media. Provide apis, memcpy_to_pmem(), wmb_pmem(), and memremap_pmem(), to write data to pmem and assert that it is durable in PMEM (a persistent linear address range). A '__pmem' attribute is added so sparse can track proper usage of pointers to pmem. This continues the status quo of pmem being x86 only for 4.2, but reworks to ioremap, and wider implementation of memremap() will enable other archs in 4.3. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000932.html Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: NRoss Zwisler <ross.zwisler@linux.intel.com> [djbw: various reworks] Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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- 11 5月, 2015 1 次提交
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由 Dan Streetman 提交于
Add 842-format software compression and decompression functions. Update the MAINTAINERS 842 section to include the new files. The 842 compression function can compress any input data into the 842 compression format. The 842 decompression function can decompress any standard-format 842 compressed data - specifically, either a compressed data buffer created by the 842 software compression function, or a compressed data buffer created by the 842 hardware compressor (located in PowerPC coprocessors). The 842 compressed data format is explained in the header comments. This is used in a later patch to provide a full software 842 compression and decompression crypto interface. Signed-off-by: NDan Streetman <ddstreet@ieee.org> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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