On Mon, 2019-08-19 at 06:40:25 UTC, Christophe Leroy wrote:
> If a page is already mapped RW without the DIRTY flag, the DIRTY
> flag is never set and a TLB store miss exception is taken forever.
>
> This is easily reproduced with the following app:
>
> void main(void)
> {
> volatile char *ptr = mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED |
> MAP_ANONYMOUS, -1, 0);
>
> *ptr = *ptr;
> }
>
> When DIRTY flag is not set, bail out of TLB miss handler and take
> a minor page fault which will set the DIRTY flag.
>
> Fixes: f8b58c64eaef ("powerpc/603: let's handle PAGE_DIRTY directly")
> Cc: sta...@vger.kernel.org
> Reported-by: Doug Crawford <doug.crawf...@intelight-its.com>
> Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/415480dce2ef03bb8335deebd2f402f475443ce0
cheers
