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[PATCH] Define vsyscall cache as blob to make clearer that user space shouldn't use it

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Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-30 01:47:55 +02:00 • committed by Andi Kleen
parent 120b114237
commit 34596dc9e5
3 changed files with 15 additions and 13 deletions
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12
include/linux/getcpu.h
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@ -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out of date, but will be faster.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