The patch titled
vmscan: avoid subtraction of unsigned types
has been added to the -mm tree. Its filename is
vmscan-avoid-subtraction-of-unsigned-types.patch
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------------------------------------------------------
Subject: vmscan: avoid subtraction of unsigned types
From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
'slab_reclaimable' and 'nr_pages' are unsigned. Subtraction is unsafe
because negative results would be misinterpreted.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff -puN mm/vmscan.c~vmscan-avoid-subtraction-of-unsigned-types mm/vmscan.c
--- a/mm/vmscan.c~vmscan-avoid-subtraction-of-unsigned-types
+++ a/mm/vmscan.c
@@ -2598,7 +2598,7 @@ static int __zone_reclaim(struct zone *z
.swappiness = vm_swappiness,
.order = order,
};
- unsigned long slab_reclaimable;
+ unsigned long nr_slab_pages0, nr_slab_pages1;
cond_resched();
/*
@@ -2623,8 +2623,8 @@ static int __zone_reclaim(struct zone *z
} while (priority >= 0 && sc.nr_reclaimed < nr_pages);
}
- slab_reclaimable = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
- if (slab_reclaimable > zone->min_slab_pages) {
+ nr_slab_pages0 = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
+ if (nr_slab_pages0 > zone->min_slab_pages) {
/*
* shrink_slab() does not currently allow us to determine how
* many pages were freed in this zone. So we take the current
@@ -2636,16 +2636,17 @@ static int __zone_reclaim(struct zone *z
* take a long time.
*/
while (shrink_slab(sc.nr_scanned, gfp_mask, order) &&
- zone_page_state(zone, NR_SLAB_RECLAIMABLE) >
- slab_reclaimable - nr_pages)
+ (zone_page_state(zone, NR_SLAB_RECLAIMABLE) + nr_pages >
+ nr_slab_pages0))
;
/*
* Update nr_reclaimed by the number of slab pages we
* reclaimed from this zone.
*/
- sc.nr_reclaimed += slab_reclaimable -
- zone_page_state(zone, NR_SLAB_RECLAIMABLE);
+ nr_slab_pages1 = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
+ if (nr_slab_pages1 < nr_slab_pages0)
+ sc.nr_reclaimed += nr_slab_pages0 - nr_slab_pages1;
}
p->reclaim_state = NULL;
_
Patches currently in -mm which might be from kosaki.motohiro@xxxxxxxxxxxxxx are
acpi-fix-unused-function-warning.patch
security-add-const-to-security_task_setscheduler.patch
sched-make-sched_param-argument-static-variables-in-some-sched_setscheduler-caller.patch
mm-use-memdup_user.patch
oom-check-pf_kthread-instead-of-mm-to-skip-kthreads.patch
oom-pf_exiting-check-should-take-mm-into-account.patch
oom-introduce-find_lock_task_mm-to-fix-mm-false-positives.patch
oom-dump_tasks-use-find_lock_task_mm-too.patch
oom-improve-commentary-in-dump_tasks.patch
oom-dump_tasks-use-find_lock_task_mm-too-dump_tasks-use-find_lock_task_mm-too-fix.patch
oom-give-current-access-to-memory-reserves-if-it-has-been-killed.patch
oom-avoid-sending-exiting-tasks-a-sigkill.patch
oom-filter-tasks-not-sharing-the-same-cpuset.patch
oom-sacrifice-child-with-highest-badness-score-for-parent.patch
oom-sacrifice-child-with-highest-badness-score-for-parent-protect-dereferencing-of-tasks-comm.patch
oom-sacrifice-child-with-highest-badness-score-for-parent-fix.patch
oom-select-task-from-tasklist-for-mempolicy-ooms.patch
oom-select-task-from-tasklist-for-mempolicy-ooms-add-has_intersects_mems_allowed-uma-variant.patch
oom-select-task-from-tasklist-for-mempolicy-ooms-introduce-find_lock_task_mm-to-fix-mm-false-positives-fix.patch
oom-enable-oom-tasklist-dump-by-default.patch
oom-avoid-oom-killer-for-lowmem-allocations.patch
oom-extract-panic-helper-function.patch
oom-remove-special-handling-for-pagefault-ooms.patch
oom-move-sysctl-declarations-to-oomh.patch
mm-rename-try_set_zone_oom-to-try_set_zonelist_oom.patch
oom-remove-constraint-argument-from-select_bad_process-and-__out_of_memory.patch
oom-fold-__out_of_memory-into-out_of_memory.patch
mm-use-for_each_online_cpu-in-vmstat.patch
mempolicy-reduce-stack-size-of-migrate_pages.patch
mempolicy-reduce-stack-size-of-migrate_pages-fix.patch
vmscan-zone_reclaim-dont-call-disable_swap_token.patch
vmscan-recalculate-lru_pages-on-each-priority.patch
vmscan-tracing-add-trace-events-for-kswapd-wakeup-sleeping-and-direct-reclaim.patch
vmscan-tracing-add-trace-events-for-lru-page-isolation.patch
vmscan-tracing-add-trace-event-when-a-page-is-written.patch
vmscan-tracing-add-a-postprocessing-script-for-reclaim-related-ftrace-events.patch
vmscan-kill-prev_priority-completely.patch
vmscan-simplify-shrink_inactive_list.patch
vmscan-remove-unnecessary-temporary-vars-in-do_try_to_free_pages.patch
vmscan-set-up-pagevec-as-late-as-possible-in-shrink_inactive_list.patch
vmscan-set-up-pagevec-as-late-as-possible-in-shrink_page_list.patch
vmscan-update-isolated-page-counters-outside-of-main-path-in-shrink_inactive_list.patch
oom-dont-try-to-kill-oom_unkillable-child.patch
oom-dont-try-to-kill-oom_unkillable-child-checkpatch-fixes.patch
oom-oom_kill_process-doesnt-select-kthread-child.patch
oom-make-oom_unkillable_task-helper-function.patch
oom-oom_kill_process-needs-to-check-that-p-is-unkillable.patch
oom-proc-pid-oom_score-treat-kernel-thread-honestly.patch
oom-kill-duplicate-oom_disable-check.patch
oom-move-oom_disable-check-from-oom_kill_task-to-out_of_memory.patch
oom-cleanup-has_intersects_mems_allowed.patch
oom-remove-child-mm-check-from-oom_kill_process.patch
oom-give-the-dying-task-a-higher-priority.patch
oom-multi-threaded-process-coredump-dont-make-deadlock.patch
rmap-add-exclusive-page-to-private-anon_vma-on-swapin.patch
mm-set-vm_fault_write-in-do_swap_page.patch
drivers-base-nodec-reduce-stack-usage-of-node_read_meminfo.patch
vmscan-avoid-subtraction-of-unsigned-types.patch
reiser4.patch
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