Commit efa5ce2c authored May 08, 2019 by Vinayak Menon Committed by Prakash Gupta Jun 05, 2020

mm: skip rss check on MM_UNRECLAIMABLE



MM_UNRECLAIMABLE rss counter can be updated by drivers
on exit_files. But since exit_mm is called early, there
is a chance of false bad rss messages. Skip the check
for MM_UNRECLAIMABLE.

Change-Id: Id9a79db20f1ae711ec801a646d7c28d92e94f70b
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
[guptap@codeaurora.org: Add Kconfig entry to prevent ABI breakages in GKI]
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>

parent ff60d1d2

kernel/fork.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -666,7 +666,15 @@ static void check_mm(struct mm_struct *mm)
		"Please make sure 'struct resident_page_types[]' is updated as well");

		for (i = 0; i < NR_MM_COUNTERS; i++) {
		long x = atomic_long_read(&mm->rss_stat.count[i]);
		long x;

		#ifdef CONFIG_MM_STAT_UNRECLAIMABLE_PAGES
		/* MM_UNRECLAIMABLE could be freed later in exit_files */
		if (i == MM_UNRECLAIMABLE)
		continue;
		#endif

		x = atomic_long_read(&mm->rss_stat.count[i]);

		if (unlikely(x))
		pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld\n",