+ mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied.patch added to -mm tree

+ mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/page-writeback: use __this_cpu_inc() in account_page_dirtied()
has been added to the -mm tree.  Its filename is
     mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied.patch

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------------------------------------------------------
From: Chi Wu <wuchi.zero@gmail.com>
Subject: mm/page-writeback: use __this_cpu_inc() in account_page_dirtied()

As account_page_dirtied() was always protected by xa_lock_irqsave(), so
using __this_cpu_inc() is better.

Link: https://lkml.kernel.org/r/20210512144742.4764-1-wuchi.zero@gmail.com
Signed-off-by: Chi Wu <wuchi.zero@gmail.com>
Cc: Howard Cochran <hcochran@kernelspring.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page-writeback.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/page-writeback.c~mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied
+++ a/mm/page-writeback.c
@@ -2445,7 +2445,7 @@ void account_page_dirtied(struct page *p
 		inc_wb_stat(wb, WB_DIRTIED);
 		task_io_account_write(PAGE_SIZE);
 		current->nr_dirtied++;
-		this_cpu_inc(bdp_ratelimits);
+		__this_cpu_inc(bdp_ratelimits);
 
 		mem_cgroup_track_foreign_dirty(page, wb);
 	}
_

Patches currently in -mm which might be from wuchi.zero@gmail.com are

mm-page-writeback-fix-performance-when-bdis-share-of-ratio-is-0.patch
mm-page-writeback-update-the-comment-of-dirty-position-control.patch
mm-page-writeback-use-__this_cpu_inc-in-account_page_dirtied.patch