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

[linux-drm-fsl-dcu.git] / include / linux / getcpu.h

diff --git a/include/linux/getcpu.h b/include/linux/getcpu.h
index 031ed3780e45bf779a7dc3cd681c76e7b3d72f84..c7372d7a97be34a22874f38c388284640ae29512 100644 (file)
--- 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    out of date, but will be faster.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