On Mon, Oct 2, 2017 at 12:29 AM, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx> wrote: > On Sun, 1 Oct 2017, Christoph Hellwig wrote: > >> up_read(&mm->mmap_sem) in the fault path is a still a complete >> no-go, >> >> NAK > > Care to elaborate? > > What about mm/filemap.c:__lock_page_or_retry() then? As soon you up_read() in the page fault path other tasks will race with you before you're able to grab the write lock. HTH -- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
