Re: [PATCH] memcg: set page->private before calling swap_readpage

From: Johannes Weiner
Date: Thu Mar 18 2021 - 11:03:57 EST

On Wed, Mar 17, 2021 at 06:59:59PM -0700, Shakeel Butt wrote:
> The function swap_readpage() (and other functions it call) extracts swap
> entry from page->private. However for SWP_SYNCHRONOUS_IO, the kernel
> skips the swapcache and thus we need to manually set the page->private
> with the swap entry before calling swap_readpage().
> Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
> Reported-by: Heiko Carstens <hca@xxxxxxxxxxxxx>