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  1. 23 8月, 2012 1 次提交
    • S
      ftrace/x86: Add support for -mfentry to x86_64 · d57c5d51
      由 Steven Rostedt 提交于 
      If the kernel is compiled with gcc 4.6.0 which supports -mfentry,
then use that instead of mcount.

With mcount, frame pointers are forced with the -pg option and we
get something like:

<can_vma_merge_before>:
       55                      push   %rbp
       48 89 e5                mov    %rsp,%rbp
       53                      push   %rbx
       41 51                   push   %r9
       e8 fe 6a 39 00          callq  ffffffff81483d00 <mcount>
       31 c0                   xor    %eax,%eax
       48 89 fb                mov    %rdi,%rbx
       48 89 d7                mov    %rdx,%rdi
       48 33 73 30             xor    0x30(%rbx),%rsi
       48 f7 c6 ff ff ff f7    test   $0xfffffffff7ffffff,%rsi

With -mfentry, frame pointers are no longer forced and the call looks
like this:

<can_vma_merge_before>:
       e8 33 af 37 00          callq  ffffffff81461b40 <__fentry__>
       53                      push   %rbx
       48 89 fb                mov    %rdi,%rbx
       31 c0                   xor    %eax,%eax
       48 89 d7                mov    %rdx,%rdi
       41 51                   push   %r9
       48 33 73 30             xor    0x30(%rbx),%rsi
       48 f7 c6 ff ff ff f7    test   $0xfffffffff7ffffff,%rsi

This adds the ftrace hook at the beginning of the function before a
frame is set up, and allows the function callbacks to be able to access
parameters. As kprobes now can use function tracing (at least on x86)
this speeds up the kprobe hooks that are at the beginning of the
function.

Link: http://lkml.kernel.org/r/20120807194100.130477900@goodmis.orgAcked-by: NIngo Molnar <mingo@kernel.org>
Reviewed-by: NMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      d57c5d51
  3. 30 6月, 2012 1 次提交
  5. 26 1月, 2011 1 次提交
  7. 29 4月, 2010 1 次提交
  9. 30 12月, 2009 1 次提交
    • J
      x86-64: Modify copy_user_generic() alternatives mechanism · 1b1d9258
      由 Jan Beulich 提交于 
      In order to avoid unnecessary chains of branches, rather than
implementing copy_user_generic() as a function consisting of
just a single (possibly patched) branch, instead properly deal
with patching call instructions in the alternative instructions
framework, and move the patching into the callers.

As a follow-on, one could also introduce something like
__EXPORT_SYMBOL_ALT() to avoid patching call sites in modules.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B2BB8180200007800026AE7@vpn.id2.novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      1b1d9258
  11. 15 12月, 2009 1 次提交
    • R
      x86: don't export inline function · e6428047
      由 Rusty Russell 提交于 
      For CONFIG_PARAVIRT, load_gs_index is an inline function (it's #defined
to native_load_gs_index otherwise).

Exporting an inline function breaks the new assembler-based alphabetical
sorted symbol list:

Today's linux-next build (x86_64 allmodconfig) failed like this:

	.tmp_exports-asm.o: In function `__ksymtab_load_gs_index':
	(__ksymtab_sorted+0x5b40): undefined reference to `load_gs_index'
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
To: x86@kernel.org
Cc: alan-jenkins@tuffmail.co.uk
      e6428047
  13. 11 12月, 2009 1 次提交
  15. 16 11月, 2009 1 次提交
    • F
      x86: Add missing might_fault() checks to copy_{to,from}_user() · 3c93ca00
      由 Frederic Weisbecker 提交于 
      On x86-64, copy_[to|from]_user() rely on assembly routines that
never call might_fault(), making us missing various lockdep
checks.

This doesn't apply to __copy_from,to_user() that explicitly
handle these calls, neither is it a problem in x86-32 where
copy_to,from_user() rely on the "__" prefixed versions that
also call might_fault().
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1258382538-30979-1-git-send-email-fweisbec@gmail.com>
[ v2: fix module export ]
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3c93ca00
  17. 15 11月, 2009 1 次提交
    • J
      x86-64: __copy_from_user_inatomic() adjustments · 14722485
      由 Jan Beulich 提交于 
      This v2.6.26 commit:

    ad2fc2cd: x86: fix copy_user on x86

rendered __copy_from_user_inatomic() identical to
copy_user_generic(), yet didn't make the former just call the
latter from an inline function.

Furthermore, this v2.6.19 commit:

    b885808e: [PATCH] Add proper sparse __user casts to __copy_to_user_inatomic

converted the return type of __copy_to_user_inatomic() from
unsigned long to int, but didn't do the same to
__copy_from_user_inatomic().
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: <v.mayatskih@gmail.com>
LKML-Reference: <4AFD5778020000780001F8F4@vpn.id2.novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      14722485
  19. 26 9月, 2009 1 次提交
    • A
      x86: Use __builtin_object_size() to validate the buffer size for copy_from_user() · 9f0cf4ad
      由 Arjan van de Ven 提交于 
      gcc (4.x) supports the __builtin_object_size() builtin, which
reports the size of an object that a pointer point to, when known
at compile time. If the buffer size is not known at compile time, a
constant -1 is returned.

This patch uses this feature to add a sanity check to
copy_from_user(); if the target buffer is known to be smaller than
the copy size, the copy is aborted and a WARNing is emitted in
memory debug mode.

These extra checks compile away when the object size is not known,
or if both the buffer size and the copy length are constants.
Signed-off-by: NArjan van de Ven <arjan@linux.intel.com>
LKML-Reference: <20090926143301.2c396b94@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      9f0cf4ad
  21. 16 1月, 2009 1 次提交
  23. 21 10月, 2008 1 次提交
  25. 08 7月, 2008 1 次提交
  27. 24 6月, 2008 1 次提交
  29. 24 5月, 2008 1 次提交
  31. 14 5月, 2008 1 次提交
    • I
      x86: fix csum_partial() export · 89804c02
      由 Ingo Molnar 提交于 
      Fix this symbol export problem:

    Building modules, stage 2.
    MODPOST 193 modules
    ERROR: "csum_partial" [fs/reiserfs/reiserfs.ko] undefined!
    make[1]: *** [__modpost] Error 1
    make: *** [modules] Error 2

This is due to a known weakness of symbol exports: if a symbol's
only in-core user is an EXPORT_SYMBOL from a lib-y section, the
symbol is not linked in.

The solution is to move the export to x8664_ksyms_64.c - but the real
solution would be to fix kbuild.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      89804c02
  33. 17 4月, 2008 2 次提交
  35. 30 1月, 2008 2 次提交
  37. 11 10月, 2007 2 次提交
  39. 17 3月, 2007 1 次提交
  41. 13 2月, 2007 2 次提交
  43. 04 10月, 2006 1 次提交
  45. 26 9月, 2006 1 次提交
    • A
      [PATCH] Fix zeroing on exception in copy_*_user · 3022d734
      由 Andi Kleen 提交于 
      - Don't zero for __copy_from_user_inatomic following i386.
This will prevent spurious zeros for parallel file system writers when
one does a exception
- The string instruction version didn't zero the output on
exception. Oops.

Also I cleaned up the code a bit while I was at it and added a minor
optimization to the string instruction path.
Signed-off-by: NAndi Kleen <ak@suse.de>
      3022d734
  47. 27 6月, 2006 1 次提交
  49. 11 4月, 2006 1 次提交
  51. 10 4月, 2006 1 次提交
  53. 01 4月, 2006 1 次提交
  55. 26 3月, 2006 2 次提交
  57. 22 3月, 2006 1 次提交
    • A
      [PATCH] multiple exports of strpbrk · f4a641d6
      由 Andrew Morton 提交于 
      Sam's tree includes a new check, which found that we're exporting strpbrk()
multiple times.

It seems that the convention is that this is exported from the arch files, so
reove the lib/string.c export.

Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: David Howells <dhowells@redhat.com>
Cc: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      f4a641d6
  59. 08 2月, 2006 1 次提交
  61. 12 1月, 2006 4 次提交
  63. 11 1月, 2006 1 次提交