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[PATCH] cpuset: might_sleep_if check in cpuset_zones_allowed 

It's too easy to incorrectly call cpuset_zone_allowed() in an atomic
context without __GFP_HARDWALL set, and when done, it is not noticed until
a tight memory situation forces allocations to be tried outside the current
cpuset.

Add a 'might_sleep_if()' check, to catch this earlier on, instead of
waiting for a similar check in the mutex_lock() code, which is only rarely
invoked.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Jackson 2006-05-20 15:00:11 -07:00 committed by Linus Torvalds
parent 36be57ffe3
commit 92d1dbd274
1 changed files with 1 additions and 0 deletions
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kernel/cpuset.c
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@ -2261,6 +2261,7 @@ int __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
if (in_interrupt()) if (in_interrupt())
return 1; return 1;
node = z->zone_pgdat->node_id; node = z->zone_pgdat->node_id;
might_sleep_if(!(gfp_mask & __GFP_HARDWALL));
if (node_isset(node, current->mems_allowed)) if (node_isset(node, current->mems_allowed))
return 1; return 1;
if (gfp_mask & __GFP_HARDWALL) /* If hardwall request, stop here */ if (gfp_mask & __GFP_HARDWALL) /* If hardwall request, stop here */