On Thu, 11 Nov 2010, Bob Liu wrote:
> __set_page_dirty_no_writeback() should return true if it actually transitioned
> the page from a clean to dirty state although it seems nobody used its return
> value now.
>
> Change from v2:
> * use TestSet to avoid racing
>
> Change from v1:
> * preserving cacheline optimisation as Andrew pointed out
>
> Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
> ---
> mm/page-writeback.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index bf85062..1ebfb86 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -1158,7 +1158,7 @@ EXPORT_SYMBOL(write_one_page);
> int __set_page_dirty_no_writeback(struct page *page)
> {
> if (!PageDirty(page))
> - SetPageDirty(page);
> + return !TestSetPageDirty(page);
> return 0;
> }
No need for a conditional, just return !TestSetPageDirty(page).
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