- 25 2月, 2017 1 次提交
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由 Mike Rapoport 提交于
When a non-cooperative userfaultfd monitor copies pages in the background, it may encounter regions that were already unmapped. Addition of UFFD_EVENT_UNMAP allows the uffd monitor to track precisely changes in the virtual memory layout. Since there might be different uffd contexts for the affected VMAs, we first should create a temporary representation for the unmap event for each uffd context and then notify them one by one to the appropriate userfault file descriptors. The event notification occurs after the mmap_sem has been released. [arnd@arndb.de: fix nommu build] Link: http://lkml.kernel.org/r/20170203165141.3665284-1-arnd@arndb.de [mhocko@suse.com: fix nommu build] Link: http://lkml.kernel.org/r/20170202091503.GA22823@dhcp22.suse.cz Link: http://lkml.kernel.org/r/1485542673-24387-3-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by: NMike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: NMichal Hocko <mhocko@suse.com> Signed-off-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NHillf Danton <hillf.zj@alibaba-inc.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 24 6月, 2015 1 次提交
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由 Miklos Szeredi 提交于
Turn d_path(&file->f_path, ...); into file_path(file, ...); Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 18 4月, 2015 1 次提交
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由 Davidlohr Bueso 提交于
In the future mm->exe_file will be done without mmap_sem serialization, thus isolate and reorganize the tile elf code to make the transition easier. Good users will, make use of the more standard get_mm_exe_file(), requiring only holding the mmap_sem to read the value, and relying on reference counting to make sure that the exe file won't dissappear underneath us. The visible effects of this patch are: o We now take and drop the mmap_sem more often. Instead of just in arch_setup_additional_pages(), we also do it in: 1) get_mm_exe_file() 2) to get the mm->vm_file and notify the simulator. [Note that 1) will disappear once we change the locking rules for exe_file.] o We avoid getting a free page and doing d_path() while holding the mmap_sem. This requires reordering the checks. Signed-off-by: NDavidlohr Bueso <dbueso@suse.de> Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
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- 14 8月, 2013 2 次提交
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由 Chris Metcalf 提交于
This change creates the framework for vDSO calls, makes the existing rt_sigreturn() mechanism use it, and adds a fast gettimeofday(). Now that we need to expose the vDSO address to userspace, we add AT_SYSINFO_EHDR to the set of aux entries provided to userspace. (You can disable any extra vDSO support by booting with vdso=0, but the rt_sigreturn vDSO page will still be provided.) Note that glibc has supported the tile vDSO since release 2.17. Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
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由 Chris Metcalf 提交于
The tile code notifies the simulator of new ET_EXEC objects starting to execute so that tracing code can properly annotate the objects. However, we didn't support ET_DYN executables like ld.so, so we didn't properly load symbols, etc. This change enables that support; we use a variant of the SIM_CONTROL_DLOPEN simulator notification that newer simulators will recognize and use to set the base address for the next SIM_CONTROL_OS_EXEC notification. Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
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- 24 2月, 2013 1 次提交
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由 Michel Lespinasse 提交于
After the MAP_POPULATE handling has been moved to mmap_region() call sites, the only remaining use of the flags argument is to pass the MAP_NORESERVE flag. This can be just as easily handled by do_mmap_pgoff(), so do that and remove the mmap_region() flags parameter. [akpm@linux-foundation.org: remove double parens] Signed-off-by: NMichel Lespinasse <walken@google.com> Acked-by: NRik van Riel <riel@redhat.com> Tested-by: NAndy Lutomirski <luto@amacapital.net> Cc: Greg Ungerer <gregungerer@westnet.com.au> Cc: David Howells <dhowells@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 09 10月, 2012 1 次提交
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由 Konstantin Khlebnikov 提交于
Some security modules and oprofile still uses VM_EXECUTABLE for retrieving a task's executable file. After this patch they will use mm->exe_file directly. mm->exe_file is protected with mm->mmap_sem, so locking stays the same. Signed-off-by: NKonstantin Khlebnikov <khlebnikov@openvz.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [arch/tile] Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> [tomoyo] Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Carsten Otte <cotte@de.ibm.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Eric Paris <eparis@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Acked-by: NJames Morris <james.l.morris@oracle.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Kentaro Takeda <takedakn@nttdata.co.jp> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Venkatesh Pallipadi <venki@google.com> Acked-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 29 3月, 2012 1 次提交
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由 David Howells 提交于
Disintegrate asm/system.h for Tile. Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NChris Metcalf <cmetcalf@tilera.com>
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- 24 3月, 2012 1 次提交
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由 Jason Baron 提交于
The motivation for this patchset was that I was looking at a way for a qemu-kvm process, to exclude the guest memory from its core dump, which can be quite large. There are already a number of filter flags in /proc/<pid>/coredump_filter, however, these allow one to specify 'types' of kernel memory, not specific address ranges (which is needed in this case). Since there are no more vma flags available, the first patch eliminates the need for the 'VM_ALWAYSDUMP' flag. The flag is used internally by the kernel to mark vdso and vsyscall pages. However, it is simple enough to check if a vma covers a vdso or vsyscall page without the need for this flag. The second patch then replaces the 'VM_ALWAYSDUMP' flag with a new 'VM_NODUMP' flag, which can be set by userspace using new madvise flags: 'MADV_DONTDUMP', and unset via 'MADV_DODUMP'. The core dump filters continue to work the same as before unless 'MADV_DONTDUMP' is set on the region. The qemu code which implements this features is at: http://people.redhat.com/~jbaron/qemu-dump/qemu-dump.patch In my testing the qemu core dump shrunk from 383MB -> 13MB with this patch. I also believe that the 'MADV_DONTDUMP' flag might be useful for security sensitive apps, which might want to select which areas are dumped. This patch: The VM_ALWAYSDUMP flag is currently used by the coredump code to indicate that a vma is part of a vsyscall or vdso section. However, we can determine if a vma is in one these sections by checking it against the gate_vma and checking for a non-NULL return value from arch_vma_name(). Thus, freeing a valuable vma bit. Signed-off-by: NJason Baron <jbaron@redhat.com> Acked-by: NRoland McGrath <roland@hack.frob.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Avi Kivity <avi@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 07 7月, 2010 1 次提交
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由 Chris Metcalf 提交于
This commit is primarily changes caused by reviewing "sparse" and "checkpatch" output on our sources, so is somewhat noisy, since things like "printk() -> pr_err()" (or whatever) throughout the codebase tend to get tedious to read. Rather than trying to tease apart precisely which things changed due to which type of code review, this commit includes various cleanups in the code: - sparse: Add declarations in headers for globals. - sparse: Fix __user annotations. - sparse: Using gfp_t consistently instead of int. - sparse: removing functions not actually used. - checkpatch: Clean up printk() warnings by using pr_info(), etc.; also avoid partial-line printks except in bootup code. - checkpatch: Use exposed structs rather than typedefs. - checkpatch: Change some C99 comments to C89 comments. In addition, a couple of minor other changes are rolled in to this commit: - Add support for a "raise" instruction to cause SIGFPE, etc., to be raised. - Remove some compat code that is unnecessary when we fully eliminate some of the deprecated syscalls from the generic syscall ABI. - Update the tile_defconfig to reflect current config contents. Signed-off-by: NChris Metcalf <cmetcalf@tilera.com> Acked-by: NArnd Bergmann <arnd@arndb.de>
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- 05 6月, 2010 1 次提交
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由 Chris Metcalf 提交于
This change is the core kernel support for TILEPro and TILE64 chips. No driver support (except the console driver) is included yet. This includes the relevant Linux headers in asm/; the low-level low-level "Tile architecture" headers in arch/, which are shared with the hypervisor, etc., and are build-system agnostic; and the relevant hypervisor headers in hv/. Signed-off-by: NChris Metcalf <cmetcalf@tilera.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Reviewed-by: NPaul Mundt <lethal@linux-sh.org>
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