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fork: remove use of percpu_counter_sum_all

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This effectively reverts the change made in commit f689054aac
("percpu_counter: add percpu_counter_sum_all interface") as the
race condition percpu_counter_sum_all() was invented to avoid is
now handled directly in percpu_counter_sum() and nobody needs to
care about summing racing with cpu unplug anymore.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner
2023-03-15 17:31:03 -07:00
committed by Darrick J. Wong
parent 8b57b11cca
commit 7ba85fba47
1 changed files with 0 additions and 5 deletions
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5
kernel/fork.c
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@@ -755,11 +755,6 @@ static void check_mm(struct mm_struct *mm)
for (i = 0; i < NR_MM_COUNTERS; i++) {
long x = percpu_counter_sum(&mm->rss_stat[i]);
if (likely(!x))
continue;
/* Making sure this is not due to race with CPU offlining. */
x = percpu_counter_sum_all(&mm->rss_stat[i]);
if (unlikely(x))
pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld\n",
mm, resident_page_types[i], x);