On Thu 24-08-17 16:12:47, Anshuman Khandual wrote:
> xfs_btree_split() calls xfs_btree_split_worker() with args.kswapd set
> if current->flags alrady has PF_KSWAPD. Hence we should not again add
> PF_KSWAPD into the current flags inside kswapd context. So drop this
> redundant flag addition.
I am not familiar with the code but your change seems incorect. The
whole point of args->kswapd is to convey the kswapd context to the
worker which is obviously running in a different context. So this patch
loses the kswapd context.
> Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
> ---
> fs/xfs/libxfs/xfs_btree.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
> index e0bcc4a..b3c85e3 100644
> --- a/fs/xfs/libxfs/xfs_btree.c
> +++ b/fs/xfs/libxfs/xfs_btree.c
> @@ -2895,7 +2895,7 @@ struct xfs_btree_split_args {
> * in any way.
> */
> if (args->kswapd)
> - new_pflags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
> + new_pflags |= PF_MEMALLOC | PF_SWAPWRITE;
>
> current_set_flags_nested(&pflags, new_pflags);
>
> --
> 1.8.5.2
--
Michal Hocko
SUSE Labs
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