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authorAndi Kleen <ak@suse.de>2006-09-29 19:47:55 -0400
committerAndi Kleen <andi@basil.nowhere.org>2006-09-29 19:47:55 -0400
commit34596dc9e59d7bece16fe5aba08116b49465da26 (patch)
tree75e09786a8ff8db3a69a5c82663f97d317e59e46 /include
parent120b114237e2461fb4fa437c5c37edf014c916b9 (diff)
[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')
-rw-r--r--include/linux/getcpu.h12
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 @@
1#ifndef _LINUX_GETCPU_H 1#ifndef _LINUX_GETCPU_H
2#define _LINUX_GETCPU_H 1 2#define _LINUX_GETCPU_H 1
3 3
4/* Cache for getcpu() to speed it up. Results might be upto a jiffie 4/* Cache for getcpu() to speed it up. Results might be a short time
5 out of date, but will be faster. 5 out of date, but will be faster.
6
6 User programs should not refer to the contents of this structure. 7 User programs should not refer to the contents of this structure.
7 It is only a cache for vgetcpu(). It might change in future kernels. 8 I repeat they should not refer to it. If they do they will break
9 in future kernels.
10
11 It is only a private cache for vgetcpu(). It will change in future kernels.
8 The user program must store this information per thread (__thread) 12 The user program must store this information per thread (__thread)
9 If you want 100% accurate information pass NULL instead. */ 13 If you want 100% accurate information pass NULL instead. */
10struct getcpu_cache { 14struct getcpu_cache {
11 unsigned long t0; 15 unsigned long blob[128 / sizeof(long)];
12 unsigned long t1;
13 unsigned long res[4];
14}; 16};
15 17
16#endif 18#endif