Re: [PATCH v3 1/2] mm/swapfile: fix possible data races of inuse_pages

Qian Cai
2022-06-27T12:43:23Z

On Sat, Jun 25, 2022 at 05:33:45PM +0800, Miaohe Lin wrote:
> si->inuse_pages could still be accessed concurrently now. The plain reads
> outside si->lock critical section, i.e. swap_show and si_swapinfo, which
> results in data races. READ_ONCE and WRITE_ONCE is used to fix such data
> races. Note these data races should be ok because they're just used for
> showing swap info.

Was this found by kcsan? If so, it would be useful to record the exact
kscan report in the commit message.