diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-03-23 12:01:05 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-23 16:38:17 +0100 |
| commit | 394e3902c55e667945f6f1c2bdbc59842cce70f7 (patch) | |
| tree | f4bca0bdc0c291fda6f6949265aacec0669b9084 /fs | |
| parent | [PATCH] Only allocate percpu data for possible CPUs (diff) | |
| download | linux-394e3902c55e667945f6f1c2bdbc59842cce70f7.tar.xz linux-394e3902c55e667945f6f1c2bdbc59842cce70f7.zip | |
[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 '')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_stats.c | 7 | ||||
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_sysctl.c | 3 |
2 files changed, 3 insertions, 7 deletions
diff --git a/fs/xfs/linux-2.6/xfs_stats.c b/fs/xfs/linux-2.6/xfs_stats.c index 8955720a2c6b..713e6a7505d0 100644 --- a/fs/xfs/linux-2.6/xfs_stats.c +++ b/fs/xfs/linux-2.6/xfs_stats.c @@ -62,18 +62,15 @@ xfs_read_xfsstats( while (j < xstats[i].endpoint) { val = 0; /* sum over all cpus */ - for (c = 0; c < NR_CPUS; c++) { - if (!cpu_possible(c)) continue; + for_each_cpu(c) val += *(((__u32*)&per_cpu(xfsstats, c) + j)); - } len += sprintf(buffer + len, " %u", val); j++; } buffer[len++] = '\n'; } /* extra precision counters */ - for (i = 0; i < NR_CPUS; i++) { - if (!cpu_possible(i)) continue; + for_each_cpu(i) { xs_xstrat_bytes += per_cpu(xfsstats, i).xs_xstrat_bytes; xs_write_bytes += per_cpu(xfsstats, i).xs_write_bytes; xs_read_bytes += per_cpu(xfsstats, i).xs_read_bytes; diff --git a/fs/xfs/linux-2.6/xfs_sysctl.c b/fs/xfs/linux-2.6/xfs_sysctl.c index a02564972420..7079cc837210 100644 --- a/fs/xfs/linux-2.6/xfs_sysctl.c +++ b/fs/xfs/linux-2.6/xfs_sysctl.c @@ -38,8 +38,7 @@ xfs_stats_clear_proc_handler( if (!ret && write && *valp) { printk("XFS Clearing xfsstats\n"); - for (c = 0; c < NR_CPUS; c++) { - if (!cpu_possible(c)) continue; + for_each_cpu(c) { preempt_disable(); /* save vn_active, it's a universal truth! */ vn_active = per_cpu(xfsstats, c).vn_active; |