Annotation of /trunk/kernel26-xen/patches-2.6.25-r1/1031-2.6.25-xen-seccomp-disable-tsc-option.patch
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Revision 609 -
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Fri May 23 17:35:37 2008 UTC (16 years ago) by niro
File size: 1156 byte(s)
Fri May 23 17:35:37 2008 UTC (16 years ago) by niro
File size: 1156 byte(s)
-using opensuse xen patchset, updated kernel configs
| 1 | niro | 609 | 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 | This only applies to i386. | ||
| 10 | |||
| 11 | Ported from 2.6.19 to 2.6.24-rc7 by Jeff Mahoney. | ||
| 12 | |||
| 13 | Signed-off-by: Andrea Arcangeli <andrea@cpushare.com> | ||
| 14 | Acked-by: Jeff Mahoney <jeffm@suse.com> | ||
| 15 | Automatically created from "patches.fixes/seccomp-disable-tsc-option" by xen-port-patches.py | ||
| 16 | |||
| 17 | Index: head-2008-04-15/arch/x86/kernel/process_32-xen.c | ||
| 18 | =================================================================== | ||
| 19 | --- head-2008-04-15.orig/arch/x86/kernel/process_32-xen.c 2008-04-15 10:47:44.000000000 +0200 | ||
| 20 | +++ head-2008-04-15/arch/x86/kernel/process_32-xen.c 2008-04-15 10:47:49.000000000 +0200 | ||
| 21 | @@ -441,6 +441,7 @@ static void hard_disable_TSC(void) | ||
| 22 | } | ||
| 23 | void disable_TSC(void) | ||
| 24 | { | ||
| 25 | +#ifdef CONFIG_SECCOMP_DISABLE_TSC | ||
| 26 | preempt_disable(); | ||
| 27 | if (!test_and_set_thread_flag(TIF_NOTSC)) | ||
| 28 | /* | ||
| 29 | @@ -449,6 +450,7 @@ void disable_TSC(void) | ||
| 30 | */ | ||
| 31 | hard_disable_TSC(); | ||
| 32 | preempt_enable(); | ||
| 33 | +#endif | ||
| 34 | } | ||
| 35 | static void hard_enable_TSC(void) | ||
| 36 | { |