On Mon, 7 Jul 2014 09:53:56 +0900 Minchan Kim <minchan@xxxxxxxxxx> wrote: > MADV_FREE needs pmd_dirty and pmd_mkclean for detecting recent > overwrite of the contents since MADV_FREE syscall is called for > THP page but for s390 pmds only referenced bit is available > because there is no free bit left in the pmd entry for the > software dirty bit so this patch adds dumb pmd_dirty which > returns always true by suggesting by Martin. > > They finally find a solution in future. > http://marc.info/?l=linux-api&m=140440328820808&w=2 > > Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> > Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx> > Cc: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx> > Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx> > Cc: linux-s390@xxxxxxxxxxxxxxx > Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> > --- > arch/s390/include/asm/pgtable.h | 12 ++++++++++++ > 1 file changed, 12 insertions(+) Acked-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>