- 07 9月, 2017 6 次提交
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由 Andy Lutomirski 提交于
While debugging a problem, I thought that using cr4_set_bits_and_update_boot() to restore CR4.PCIDE would be helpful. It turns out to be counterproductive. Add a comment documenting how this works. Signed-off-by: NAndy Lutomirski <luto@kernel.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Andy Lutomirski 提交于
When Linux brings a CPU down and back up, it switches to init_mm and then loads swapper_pg_dir into CR3. With PCID enabled, this has the side effect of masking off the ASID bits in CR3. This can result in some confusion in the TLB handling code. If we bring a CPU down and back up with any ASID other than 0, we end up with the wrong ASID active on the CPU after resume. This could cause our internal state to become corrupt, although major corruption is unlikely because init_mm doesn't have any user pages. More obviously, if CONFIG_DEBUG_VM=y, we'll trip over an assertion in the next context switch. The result of *that* is a failure to resume from suspend with probability 1 - 1/6^(cpus-1). Fix it by reinitializing cpu_tlbstate on resume and CPU bringup. Reported-by: NLinus Torvalds <torvalds@linux-foundation.org> Reported-by: NJiri Kosina <jikos@kernel.org> Fixes: 10af6235 ("x86/mm: Implement PCID based optimization: try to preserve old TLB entries using PCID") Signed-off-by: NAndy Lutomirski <luto@kernel.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Rik van Riel 提交于
Introduce MADV_WIPEONFORK semantics, which result in a VMA being empty in the child process after fork. This differs from MADV_DONTFORK in one important way. If a child process accesses memory that was MADV_WIPEONFORK, it will get zeroes. The address ranges are still valid, they are just empty. If a child process accesses memory that was MADV_DONTFORK, it will get a segmentation fault, since those address ranges are no longer valid in the child after fork. Since MADV_DONTFORK also seems to be used to allow very large programs to fork in systems with strict memory overcommit restrictions, changing the semantics of MADV_DONTFORK might break existing programs. MADV_WIPEONFORK only works on private, anonymous VMAs. The use case is libraries that store or cache information, and want to know that they need to regenerate it in the child process after fork. Examples of this would be: - systemd/pulseaudio API checks (fail after fork) (replacing a getpid check, which is too slow without a PID cache) - PKCS#11 API reinitialization check (mandated by specification) - glibc's upcoming PRNG (reseed after fork) - OpenSSL PRNG (reseed after fork) The security benefits of a forking server having a re-inialized PRNG in every child process are pretty obvious. However, due to libraries having all kinds of internal state, and programs getting compiled with many different versions of each library, it is unreasonable to expect calling programs to re-initialize everything manually after fork. A further complication is the proliferation of clone flags, programs bypassing glibc's functions to call clone directly, and programs calling unshare, causing the glibc pthread_atfork hook to not get called. It would be better to have the kernel take care of this automatically. The patch also adds MADV_KEEPONFORK, to undo the effects of a prior MADV_WIPEONFORK. This is similar to the OpenBSD minherit syscall with MAP_INHERIT_ZERO: https://man.openbsd.org/minherit.2 [akpm@linux-foundation.org: numerically order arch/parisc/include/uapi/asm/mman.h #defines] Link: http://lkml.kernel.org/r/20170811212829.29186-3-riel@redhat.comSigned-off-by: NRik van Riel <riel@redhat.com> Reported-by: NFlorian Weimer <fweimer@redhat.com> Reported-by: NColm MacCártaigh <colm@allcosts.net> Reviewed-by: NMike Kravetz <mike.kravetz@oracle.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Helge Deller <deller@gmx.de> Cc: Kees Cook <keescook@chromium.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Drewry <wad@chromium.org> Cc: <linux-api@vger.kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Rik van Riel 提交于
Patch series "mm,fork,security: introduce MADV_WIPEONFORK", v4. If a child process accesses memory that was MADV_WIPEONFORK, it will get zeroes. The address ranges are still valid, they are just empty. If a child process accesses memory that was MADV_DONTFORK, it will get a segmentation fault, since those address ranges are no longer valid in the child after fork. Since MADV_DONTFORK also seems to be used to allow very large programs to fork in systems with strict memory overcommit restrictions, changing the semantics of MADV_DONTFORK might break existing programs. The use case is libraries that store or cache information, and want to know that they need to regenerate it in the child process after fork. Examples of this would be: - systemd/pulseaudio API checks (fail after fork) (replacing a getpid check, which is too slow without a PID cache) - PKCS#11 API reinitialization check (mandated by specification) - glibc's upcoming PRNG (reseed after fork) - OpenSSL PRNG (reseed after fork) The security benefits of a forking server having a re-inialized PRNG in every child process are pretty obvious. However, due to libraries having all kinds of internal state, and programs getting compiled with many different versions of each library, it is unreasonable to expect calling programs to re-initialize everything manually after fork. A further complication is the proliferation of clone flags, programs bypassing glibc's functions to call clone directly, and programs calling unshare, causing the glibc pthread_atfork hook to not get called. It would be better to have the kernel take care of this automatically. The patchset also adds MADV_KEEPONFORK, to undo the effects of a prior MADV_WIPEONFORK. This is similar to the OpenBSD minherit syscall with MAP_INHERIT_ZERO: https://man.openbsd.org/minherit.2 This patch (of 2): MPX only seems to be available on 64 bit CPUs, starting with Skylake and Goldmont. Move VM_MPX into the 64 bit only portion of vma->vm_flags, in order to free up a VMA flag. Link: http://lkml.kernel.org/r/20170811212829.29186-2-riel@redhat.comSigned-off-by: NRik van Riel <riel@redhat.com> Acked-by: NDave Hansen <dave.hansen@intel.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Florian Weimer <fweimer@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Will Drewry <wad@chromium.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Matthew Wilcox <willy@infradead.org> Cc: Colm MacCártaigh <colm@allcosts.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Mike Kravetz 提交于
A non-default huge page size can be encoded in the flags argument of the mmap system call. The definitions for these encodings are in arch specific header files. However, all architectures use the same values. Consolidate all the definitions in the primary user header file (uapi/linux/mman.h). Include definitions for all known huge page sizes. Use the generic encoding definitions in hugetlb_encode.h as the basis for these definitions. Link: http://lkml.kernel.org/r/1501527386-10736-3-git-send-email-mike.kravetz@oracle.comSigned-off-by: NMike Kravetz <mike.kravetz@oracle.com> Acked-by: NMichal Hocko <mhocko@suse.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michael Kerrisk <mtk.manpages@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 Dou Liyang 提交于
Commit a7be6e5a ("mm: drop useless local parameters of __register_one_node()") removes the last user of parent_node(). The parent_node() macro in METAG architecture is unnecessary. Remove it for cleanup. Link: http://lkml.kernel.org/r/1501076076-1974-4-git-send-email-douly.fnst@cn.fujitsu.comSigned-off-by: NDou Liyang <douly.fnst@cn.fujitsu.com> Reported-by: NMichael Ellerman <mpe@ellerman.id.au> Cc: James Hogan <james.hogan@imgtec.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 05 9月, 2017 10 次提交
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由 Ben Hutchings 提交于
Commit 00fc0e0d ("alpha: move exports to actual definitions") also removed the exports of the math emulator hooks, which are defined in C code. In case anyone cares about the option of CONFIG_MATHEMU=m, add exports next to those definitions. Also add a MODULE_LICENSE. Fixes: 00fc0e0d ("alpha: move exports to actual definitions") Signed-off-by: NBen Hutchings <ben@decadent.org.uk> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Ben Hutchings 提交于
Add <asm/asm-prototypes.h> so that genksyms knows the types of these symbols and can generate CRCs for them. Fixes: 00fc0e0d ("alpha: move exports to actual definitions") Signed-off-by: NBen Hutchings <ben@decadent.org.uk> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Krzysztof Kozlowski 提交于
Remove old, dead Kconfig options (in order appearing in this commit): - IP_NF_QUEUE: commit 3dd6664f ("netfilter: remove unused "config IP_NF_QUEUE""); - AUTOFS_FS: commit 561c5cf9 ("staging: Remove autofs3"); Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Geliang Tang 提交于
Use kobj_to_dev() instead of open-coding it. Signed-off-by: NGeliang Tang <geliangtang@163.com> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Masahiro Yamada 提交于
Remove unneeded variables and assignments. While we are here, fix the coding style of SMC37c669_read_config(): - replace whitespaces at the start of lines with tabs - remove unneeded whitespaces around parentheses Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Shyam Saini 提交于
Replace explicit computation of vma page count by a call to vma_pages() Signed-off-by: NShyam Saini <mayhs11saini@gmail.com> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Dan Carpenter 提交于
We check that "member" is in bounds for the first line, but we also use it on the next line without checking which is a mistake. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Julia Cartwright 提交于
The alpha/marvel code currently implements an irq_chip for handling interrupts; due to how irq_chip handling is done, it's necessary for the irq_chip methods to be invoked from hardirq context, even on a a real-time kernel. Because the spinlock_t type becomes a "sleeping" spinlock w/ RT kernels, it is not suitable to be used with irq_chips. A quick audit of the operations under the lock reveal that they do only minimal, bounded work, and are therefore safe to do under a raw spinlock. Signed-off-by: NJulia Cartwright <julia@ni.com> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Sergei Trofimovich 提交于
__NR_sys_epoll_create and friends are alpha-specific while __NR_epoll_create is a generic name for other arches. Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: linux-alpha@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: NSergei Trofimovich <slyfox@gentoo.org> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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由 Tobias Klauser 提交于
The arch uses a verbatim copy of the asm-generic version and does not add any own implemntations to the header, so use asm-generic/fb.h instead of duplicating code. Signed-off-by: NTobias Klauser <tklauser@distanz.ch> Signed-off-by: NMatt Turner <mattst88@gmail.com>
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- 04 9月, 2017 3 次提交
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由 Varsha Rao 提交于
This patch removes CONFIG_NETFILTER_DEBUG and _ASSERT() macros as they are no longer required. Replace _ASSERT() macros with WARN_ON(). Signed-off-by: NVarsha Rao <rvarsha016@gmail.com> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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由 Cédric Le Goater 提交于
xive_spapr_init() is called from a __init routine and calls __init routines. Signed-off-by: NCédric Le Goater <clg@kaod.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Paul Mackerras 提交于
Commit 350779a2 ("powerpc: Handle most loads and stores in instruction emulation code", 2017-08-30) changed the register usage in get_vr and put_vr with the aim of leaving the register number in r3 untouched on return. Unfortunately, r6 was not a good choice, as the callers as of 350779a2 store a MSR value in r6. Then, in commit c22435a5 ("powerpc: Emulate FP/vector/VSX loads/stores correctly when regs not live", 2017-08-30), the saving and restoring of the MSR got moved into get_vr and put_vr. Either way, the effect is that we put a value in MSR that only has the 0x3f8 bits non-zero, meaning that we are switching to 32-bit mode. That leads to a crash like this: Unable to handle kernel paging request for instruction fetch Faulting instruction address: 0x0007bea0 Oops: Kernel access of bad area, sig: 11 [#12] LE SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: vmx_crypto binfmt_misc ip_tables x_tables autofs4 crc32c_vpmsum CPU: 6 PID: 32659 Comm: trashy_testcase Tainted: G D 4.13.0-rc2-00313-gf3026f57e6ed-dirty #23 task: c000000f1bb9e780 task.stack: c000000f1ba98000 NIP: 000000000007bea0 LR: c00000000007b054 CTR: c00000000007be70 REGS: c000000f1ba9b960 TRAP: 0400 Tainted: G D (4.13.0-rc2-00313-gf3026f57e6ed-dirty) MSR: 10000000400010a1 <HV,ME,IR,LE> CR: 48000228 XER: 00000000 CFAR: c00000000007be74 SOFTE: 1 GPR00: c00000000007b054 c000000f1ba9bbe0 c000000000e6e000 000000000000001d GPR04: c000000f1ba9bc00 c00000000007be70 00000000000000e8 9000000002009033 GPR08: 0000000002000000 100000000282f033 000000000b0a0900 0000000000001009 GPR12: 0000000000000000 c00000000fd42100 0706050303020100 a5a5a5a5a5a5a5a5 GPR16: 2e2e2e2e2e2de70c 2e2e2e2e2e2e2e2d 0000000000ff00ff 0606040202020000 GPR20: 000000000000005b ffffffffffffffff 0000000003020100 0000000000000000 GPR24: c000000f1ab90020 c000000f1ba9bc00 0000000000000001 0000000000000001 GPR28: c000000f1ba9bc90 c000000f1ba9bea0 000000000b0a0908 0000000000000001 NIP [000000000007bea0] 0x7bea0 LR [c00000000007b054] emulate_loadstore+0x1044/0x1280 Call Trace: [c000000f1ba9bbe0] [c000000000076b80] analyse_instr+0x60/0x34f0 (unreliable) [c000000f1ba9bc70] [c00000000007b7ec] emulate_step+0x23c/0x544 [c000000f1ba9bce0] [c000000000053424] arch_uprobe_skip_sstep+0x24/0x40 [c000000f1ba9bd00] [c00000000024b2f8] uprobe_notify_resume+0x598/0xba0 [c000000f1ba9be00] [c00000000001c284] do_notify_resume+0xd4/0xf0 [c000000f1ba9be30] [c00000000000bd44] ret_from_except_lite+0x70/0x74 Instruction dump: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX ---[ end trace a7ae7a7f3e0256b5 ]--- To fix this, we just revert to using r3 as before, since the callers don't rely on r3 being left unmodified. Fortunately, this can't be triggered by a misaligned load or store, because vector loads and stores truncate misaligned addresses rather than taking an alignment interrupt. It can be triggered using uprobes. Fixes: 350779a2 ("powerpc: Handle most loads and stores in instruction emulation code") Reported-by: NAnton Blanchard <anton@ozlabs.org> Signed-off-by: NPaul Mackerras <paulus@ozlabs.org> Tested-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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- 02 9月, 2017 9 次提交
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由 Cédric Le Goater 提交于
Having the CPU identifier in the debug logs is helpful when tracking issues. Also add some more logging and fix a compile issue in xive_do_source_eoi(). Signed-off-by: NCédric Le Goater <clg@kaod.org> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
On POWER9, the Client Architecture Support (CAS) negotiation process determines whether the guest operates in XIVE Legacy compatibility or in XIVE exploitation mode. Now that we have initial guest support for the XIVE interrupt controller, let's inform the hypervisor what we can do. The platform advertises the XIVE Exploitation Mode support using the property "ibm,arch-vec-5-platform-support-vec-5", byte 23 bits 0-1 : - 0b00 XIVE legacy mode Only - 0b01 XIVE exploitation mode Only - 0b10 XIVE legacy or exploitation mode The OS asks for XIVE Exploitation Mode support using the property "ibm,architecture-vec-5", byte 23 bits 0-1: - 0b00 XIVE legacy mode Only - 0b01 XIVE exploitation mode Only Signed-off-by: NCédric Le Goater <clg@kaod.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
The H_INT_ESB hcall() is used to issue a load or store to the ESB page instead of using the MMIO pages. This can be used as a workaround on some HW issues. The OS knows that this hcall should be used on an interrupt source when the ESB hcall flag is set to 1 in the hcall H_INT_GET_SOURCE_INFO. To maintain the frontier between the xive frontend and backend, we introduce a new xive operation 'esb_rw' to be used in the routines doing memory accesses on the ESBs. Signed-off-by: NCédric Le Goater <clg@kaod.org> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
It will be required later by the H_INT_ESB hcall. Signed-off-by: NCédric Le Goater <clg@kaod.org> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
Some source support MMIO stores on the ESB page to perform EOI. Let's introduce a specific routine for this case even if this should be the only use of it. Signed-off-by: NCédric Le Goater <clg@kaod.org> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
xive_poke_esb() is performing a load/read so it is better named as xive_esb_read() as we will need to introduce a xive_esb_write() routine. Also use the XIVE_ESB_LOAD_EOI offset when EOI'ing LSI interrupts. Signed-off-by: NCédric Le Goater <clg@kaod.org> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
This is the framework for using XIVE in a PowerVM guest. The support is very similar to the native one in a much simpler form. Each source is associated with an Event State Buffer (ESB). This is a two bit state machine which is used to trigger events. The bits are named "P" (pending) and "Q" (queued) and can be controlled by MMIO. The Guest OS registers event (or notifications) queues on which the HW will post event data for a target to notify. Instead of OPAL calls, a set of Hypervisors call are used to configure the interrupt sources and the event/notification queues of the guest: - H_INT_GET_SOURCE_INFO used to obtain the address of the MMIO page of the Event State Buffer (PQ bits) entry associated with the source. - H_INT_SET_SOURCE_CONFIG assigns a source to a "target". - H_INT_GET_SOURCE_CONFIG determines to which "target" and "priority" is assigned to a source - H_INT_GET_QUEUE_INFO returns the address of the notification management page associated with the specified "target" and "priority". - H_INT_SET_QUEUE_CONFIG sets or resets the event queue for a given "target" and "priority". It is also used to set the notification config associated with the queue, only unconditional notification for the moment. Reset is performed with a queue size of 0 and queueing is disabled in that case. - H_INT_GET_QUEUE_CONFIG returns the queue settings for a given "target" and "priority". - H_INT_RESET resets all of the partition's interrupt exploitation structures to their initial state, losing all configuration set via the hcalls H_INT_SET_SOURCE_CONFIG and H_INT_SET_QUEUE_CONFIG. - H_INT_SYNC issue a synchronisation on a source to make sure sure all notifications have reached their queue. As for XICS, the XIVE interface for the guest is described in the device tree under the "interrupt-controller" node. A couple of new properties are specific to XIVE : - "reg" contains the base address and size of the thread interrupt managnement areas (TIMA), also called rings, for the User level and for the Guest OS level. Only the Guest OS level is taken into account today. - "ibm,xive-eq-sizes" the size of the event queues. One cell per size supported, contains log2 of size, in ascending order. - "ibm,xive-lisn-ranges" the interrupt numbers ranges assigned to the guest. These are allocated using a simple bitmap. and also : - "/ibm,plat-res-int-priorities" contains a list of priorities that the hypervisor has reserved for its own use. Tested with a QEMU XIVE model for pseries and with the Power hypervisor. Signed-off-by: NCédric Le Goater <clg@kaod.org> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Cédric Le Goater 提交于
This routine will be used in the spapr backend. Also introduce a short xive_alloc_order() helper. Signed-off-by: NCédric Le Goater <clg@kaod.org> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Michael Ellerman 提交于
Older compilers think val may be used uninitialized: arch/powerpc/lib/sstep.c: In function 'emulate_loadstore': arch/powerpc/lib/sstep.c:2758:23: error: 'val' may be used uninitialized in this function We know better, but initialise val to 0 to avoid breaking the build. Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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- 01 9月, 2017 12 次提交
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由 Ingo Molnar 提交于
Andrei Vagin reported a CRIU regression and bisected it back to: 90f6225f ("x86/idt: Move IST stack based traps to table init") This table init conversion loses the system-gate property of X86_TRAP_BP and erroneously moves it from DPL3 to DPL0. Fix it. Reported-by: NAndrei Vagin <avagin@virtuozzo.com> Signed-off-by: NIngo Molnar <mingo@kernel.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Cc: dvlasenk@redhat.com Cc: linux-tip-commits@vger.kernel.org Cc: peterz@infradead.org Cc: brgerst@gmail.com Cc: rostedt@goodmis.org Cc: bp@alien8.de Cc: luto@kernel.org Cc: jpoimboe@redhat.com Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: torvalds@linux-foundation.org Cc: tip-bot for Jacob Shin <tipbot@zytor.com> Link: http://lkml.kernel.org/r/20170901082630.xvyi5bwk6etmppqc@gmail.com
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由 Markus Elfring 提交于
* Return directly after a call of the function "kzalloc" failed at the beginning. * Delete a repeated check for the local variable "bank" which became unnecessary with this refactoring. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Markus Elfring 提交于
Replace the specification of a data structure by a pointer dereference as the parameter for the operator "sizeof" to make the corresponding size determination a bit safer according to the Linux coding style convention. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Markus Elfring 提交于
Omit an extra message for a memory allocation failure in this function. This issue was detected by using the Coccinelle software. Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdfSigned-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Alistair Popple 提交于
The nest MMU tlb flush needs to happen before the GPU translation shootdown is launched to avoid the GPU refilling its tlb with stale nmmu translations prior to the nmmu flush completing. Fixes: 1ab66d1f ("powerpc/powernv: Introduce address translation services for Nvlink2") Cc: stable@vger.kernel.org # v4.12+ Signed-off-by: NAlistair Popple <alistair@popple.id.au> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Julia Lawall 提交于
Use DEVICE_ATTR_RW for read-write attributes. This simplifies the source code, improves readbility, and reduces the chance of inconsistencies. Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Markus Elfring 提交于
Omit an extra message for a memory allocation failure in eeh_dev_init(). This issue was detected by using the Coccinelle software. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> [mpe: Do not drop the message that can happen at runtime and lead to an event not being handled] Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Markus Elfring 提交于
Two single characters (line breaks) should be put into a sequence. Thus use the corresponding function "seq_putc". This issue was detected by using the Coccinelle software. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Haren Myneni 提交于
This patch adds changes for checking P9 specific 842 engine error codes. These errros are reported in coprocessor status block (CSB) for failures. Signed-off-by: NHaren Myneni <haren@us.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Christophe Leroy 提交于
memset() is patched after initialisation to activate the optimised part which uses cache instructions. Today we have a 'b 2f' to skip the optimised patch, which then gets replaced by a NOP, implying a useless cycle consumption. As we have a 'bne 2f' just before, we could use that instruction for the live patching, hence removing the need to have a dedicated 'b 2f' to be replaced by a NOP. This patch changes the 'bne 2f' by a 'b 2f'. During init, that 'b 2f' is then replaced by 'bne 2f' Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Christophe Leroy 提交于
There is no need to extend the set value to an int when the length is lower than 4 as in that case we only do byte stores. We can therefore immediately branch to the part handling it. By separating it from the normal case, we are able to eliminate a few actions on the destination pointer. Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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由 Christophe Leroy 提交于
Commit 9445aa1a ("ppc: move exports to definitions") added EXPORT_SYMBOL() for memset() and flush_hash_pages() in the middle of the functions. This patch moves them at the end of the two functions. Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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