writeback: don't access page->mapping directly in track_foreign_dirty TP

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page->mapping may encode different values in it and page_mapping()
should always be used to access the mapping pointer.
track_foreign_dirty tracepoint was incorrectly accessing page->mapping
directly.  Use page_mapping() instead.  Also, add NULL checks while at
it.

Fixes: 3a8e9ac89e ("writeback: add tracepoints for cgroup foreign writebacks")
Reported-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Tejun Heo 2019-08-30 16:39:54 -07:00 • committed by Jens Axboe

parent 8f5914bcee

commit 0feacaa216

1 changed files with 4 additions and 1 deletions

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include/trace/events/writeback.h

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