diff options
| author | Miaohe Lin | 2022-03-22 14:39:31 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2022-03-22 15:57:01 -0700 |
| commit | 854d8e36168d79ad09a831d60bd4d835ad33e188 (patch) | |
| tree | a3c354c12aa52b92c3bd151776cb682de0aa4961 /mm | |
| parent | eb5279fb7e41804ecc15ed3cf716a9e2b419af57 (diff) | |
mm/writeback: minor clean up for highmem_dirtyable_memory
Since commit a804552b9a15 ("mm/page-writeback.c: fix
dirty_balance_reserve subtraction from dirtyable memory"), local
variable x can not be negative. And it can not overflow when it is the
total number of dirtyable highmem pages. Thus remove the unneeded
comment and overflow check.
Link: https://lkml.kernel.org/r/20220224115416.46089-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page-writeback.c | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 91d163f8d36b..f13ed7639941 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -324,18 +324,6 @@ static unsigned long highmem_dirtyable_memory(unsigned long total) } /* - * Unreclaimable memory (kernel memory or anonymous memory - * without swap) can bring down the dirtyable pages below - * the zone's dirty balance reserve and the above calculation - * will underflow. However we still want to add in nodes - * which are below threshold (negative values) to get a more - * accurate calculation but make sure that the total never - * underflows. - */ - if ((long)x < 0) - x = 0; - - /* * Make sure that the number of highmem pages is never larger * than the number of the total dirtyable memory. This can only * occur in very strange VM situations but we want to make sure |