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authorAndi Kleen <ak@suse.de>2006-09-30 01:47:55 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-09-30 01:47:55 +0200
commit34596dc9e59d7bece16fe5aba08116b49465da26 (patch)
tree75e09786a8ff8db3a69a5c82663f97d317e59e46 /include/linux/getcpu.h
parent120b114237e2461fb4fa437c5c37edf014c916b9 (diff)
downloadop-kernel-dev-34596dc9e59d7bece16fe5aba08116b49465da26.zip
op-kernel-dev-34596dc9e59d7bece16fe5aba08116b49465da26.tar.gz
[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.h12
1 files changed, 7 insertions, 5 deletions
diff --git a/include/linux/getcpu.h b/include/linux/getcpu.h
index 031ed37..c7372d7 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out of date, but will be faster.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
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