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author | Andi Kleen <ak@suse.de> | 2006-09-30 01:47:55 +0200 |
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committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-30 01:47:55 +0200 |
commit | 34596dc9e59d7bece16fe5aba08116b49465da26 (patch) | |
tree | 75e09786a8ff8db3a69a5c82663f97d317e59e46 /include/linux/getcpu.h | |
parent | 120b114237e2461fb4fa437c5c37edf014c916b9 (diff) | |
download | linux-stable-34596dc9e59d7bece16fe5aba08116b49465da26.tar.gz linux-stable-34596dc9e59d7bece16fe5aba08116b49465da26.tar.bz2 linux-stable-34596dc9e59d7bece16fe5aba08116b49465da26.zip |
[PATCH] Define vsyscall cache as blob to make clearer that user space shouldn't use it
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/linux/getcpu.h')
-rw-r--r-- | include/linux/getcpu.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/include/linux/getcpu.h b/include/linux/getcpu.h index 031ed3780e45..c7372d7a97be 100644 --- a/include/linux/getcpu.h +++ b/include/linux/getcpu.h @@ -1,16 +1,18 @@ #ifndef _LINUX_GETCPU_H #define _LINUX_GETCPU_H 1 -/* Cache for getcpu() to speed it up. Results might be upto a jiffie +/* Cache for getcpu() to speed it up. Results might be a short time out of date, but will be faster. + User programs should not refer to the contents of this structure. - It is only a cache for vgetcpu(). It might change in future kernels. + I repeat they should not refer to it. If they do they will break + in future kernels. + + It is only a private cache for vgetcpu(). It will change in future kernels. The user program must store this information per thread (__thread) If you want 100% accurate information pass NULL instead. */ struct getcpu_cache { - unsigned long t0; - unsigned long t1; - unsigned long res[4]; + unsigned long blob[128 / sizeof(long)]; }; #endif |