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authorEric Dumazet <dada1@cosmosbay.com>2006-03-23 03:01:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 07:38:17 -0800
commitb73b459f72f746a031d1ef4cc7659b20a1f1acb9 (patch)
tree6e8d58fb0bd01e0a2c24c4debdffd9eb6719a384 /fs/relayfs/buffers.h
parent[PATCH] more for_each_cpu() conversions (diff)
downloadlinux-dev-b73b459f72f746a031d1ef4cc7659b20a1f1acb9.tar.xz
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[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 'fs/relayfs/buffers.h')
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