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authorAndrew Morton <akpm@osdl.org>2006-03-23 03:01:05 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 07:38:17 -0800
commit394e3902c55e667945f6f1c2bdbc59842cce70f7 (patch)
treef4bca0bdc0c291fda6f6949265aacec0669b9084 /include/linux/genhd.h
parent63872f87a151413100678f110d1556026002809e (diff)
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[PATCH] more for_each_cpu() conversions
When we stop allocating percpu memory for not-possible CPUs we must not touch the percpu data for not-possible CPUs at all. The correct way of doing this is to test cpu_possible() or to use for_each_cpu(). This patch is a kernel-wide sweep of all instances of NR_CPUS. I found very few instances of this bug, if any. But the patch converts lots of open-coded test to use the preferred helper macros. Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@parisc-linux.org> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: Andi Kleen <ak@muc.de> Cc: Christian Zankel <chris@zankel.net> Cc: Philippe Elie <phil.el@wanadoo.fr> Cc: Nathan Scott <nathans@sgi.com> Cc: Jens Axboe <axboe@suse.de> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/genhd.h')
-rw-r--r--include/linux/genhd.h14
1 files changed, 4 insertions, 10 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index eef5ccd..fd647fd 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -149,22 +149,16 @@ struct disk_attribute {
({ \
typeof(gendiskp->dkstats->field) res = 0; \
int i; \
- for (i=0; i < NR_CPUS; i++) { \
- if (!cpu_possible(i)) \
- continue; \
+ for_each_cpu(i) \
res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
- } \
res; \
})
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
int i;
- for (i=0; i < NR_CPUS; i++) {
- if (cpu_possible(i)) {
- memset(per_cpu_ptr(gendiskp->dkstats, i), value,
- sizeof (struct disk_stats));
- }
- }
+ for_each_cpu(i)
+ memset(per_cpu_ptr(gendiskp->dkstats, i), value,
+ sizeof (struct disk_stats));
}
#else