src/patches/suse-2.6.27.25/patches.xen/xen3-seccomp-disable-tsc-option

   1 From: Andrea Arcangeli <andrea@cpushare.com>
   2 Subject: [PATCH seccomp: make tsc disabling optional
   3 Patch-mainline: unknown
   4 References: 191123
   5
   6 Make the TSC disable purely paranoid feature optional, so by default seccomp
   7 returns absolutely zerocost.
   8
   9 Ported from 2.6.19 to 2.6.24-rc7 by Jeff Mahoney.
  10 Addition of x86-64 by Jan Beulich.
  11
  12 Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
  13 Acked-by: Jeff Mahoney <jeffm@suse.com>
  14 Automatically created from "patches.fixes/seccomp-disable-tsc-option" by xen-port-patches.py
  15
  16 Index: head-2008-10-01/arch/x86/kernel/process_32-xen.c
  17 ===================================================================
  18 --- head-2008-10-01.orig/arch/x86/kernel/process_32-xen.c       2008-10-01 16:18:30.000000000 +0200
  19 +++ head-2008-10-01/arch/x86/kernel/process_32-xen.c    2008-10-01 16:20:58.000000000 +0200
  20 @@ -383,6 +383,7 @@ static void hard_disable_TSC(void)
  21
  22  void disable_TSC(void)
  23  {
  24 +#ifdef CONFIG_SECCOMP_DISABLE_TSC
  25         preempt_disable();
  26         if (!test_and_set_thread_flag(TIF_NOTSC))
  27                 /*
  28 @@ -391,6 +392,7 @@ void disable_TSC(void)
  29                  */
  30                 hard_disable_TSC();
  31         preempt_enable();
  32 +#endif
  33  }
  34
  35  static void hard_enable_TSC(void)
  36 Index: head-2008-10-01/arch/x86/kernel/process_64-xen.c
  37 ===================================================================
  38 --- head-2008-10-01.orig/arch/x86/kernel/process_64-xen.c       2008-10-01 16:20:19.000000000 +0200
  39 +++ head-2008-10-01/arch/x86/kernel/process_64-xen.c    2008-10-01 16:20:58.000000000 +0200
  40 @@ -423,6 +423,7 @@ static void hard_disable_TSC(void)
  41
  42  void disable_TSC(void)
  43  {
  44 +#ifdef CONFIG_SECCOMP_DISABLE_TSC
  45         preempt_disable();
  46         if (!test_and_set_thread_flag(TIF_NOTSC))
  47                 /*
  48 @@ -431,6 +432,7 @@ void disable_TSC(void)
  49                  */
  50                 hard_disable_TSC();
  51         preempt_enable();
  52 +#endif
  53  }
  54
  55  static void hard_enable_TSC(void)