On Wed, 2010-05-12 at 12:53 +0100, Sebastian Andrzej Siewior wrote: > * Catalin Marinas | 2010-05-12 12:10:39 [+0100]: > > >> > --- a/drivers/ata/libata-sff.c > >> > +++ b/drivers/ata/libata-sff.c > >> > @@ -894,7 +894,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc) > >> > do_write); > >> > } > >> > > >> > - if (!do_write) > >> > + if (!do_write&& !PageSlab(page)) > >> > flush_dcache_page(page); > >> > >> I would think that check belongs inside flush_dcache_page itself, rather > >> than forcing every driver to include it.. > > > >Sebastian (cc'ed) reported this as well for MIPS. > Thx. The patch above looks what I've sent a while ago. Jeff was going to > merge it afaik. > > >I think it makes sense for this check to be done in the > >flush_dcache_page() function. > > Why should flush_dcache_page() not flush pages you tell it? > From Documentation/cachetlb.txt: > | NOTE: This routine need only be called for page cache pages > | which can potentially ever be mapped into the address > | space of a user process. So for example, VFS layer code > | handling vfs symlinks in the page cache need not call > | this interface at all. > > A page from slab or stack is not going to see the sky of user land and > therefore it should not be fed into flush_dcache_page(). You are right :), so fixing the driver is the best approach. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
