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| author | Eric Dumazet <dada1@cosmosbay.com> | 2006-03-23 03:01:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-23 07:38:17 -0800 |
| commit | b73b459f72f746a031d1ef4cc7659b20a1f1acb9 (patch) | |
| tree | 6e8d58fb0bd01e0a2c24c4debdffd9eb6719a384 /kernel | |
| parent | 394e3902c55e667945f6f1c2bdbc59842cce70f7 (diff) | |
| download | kernel_samsung_smdk4412-b73b459f72f746a031d1ef4cc7659b20a1f1acb9.tar.gz kernel_samsung_smdk4412-b73b459f72f746a031d1ef4cc7659b20a1f1acb9.tar.bz2 kernel_samsung_smdk4412-b73b459f72f746a031d1ef4cc7659b20a1f1acb9.zip | |
[PATCH] __GENERIC_PER_CPU changes
Now CONFIG_DEBUG_INITDATA is in, initial percpu data
[__per_cpu_start,__per_cpu_end] can be declared as a redzone, and invalid
accesses after boot can be detected, at least for i386.
We can let non possible cpus percpu data point to this 'redzone' instead of
NULL .
NULL was not a good choice because part of [0..32768] memory may be
readable and invalid accesses may happen unnoticed.
If CONFIG_DEBUG_INITDATA is not defined, each non possible cpu points to
the initial percpu data (__per_cpu_offset[cpu] == 0), thus invalid accesses
wont be detected/crash.
This patch also moves __per_cpu_offset[] to read_mostly area to avoid false
sharing.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions