On 2/13/24 10:37, Pankaj Raghav (Samsung) wrote:
From: Pankaj Raghav <p.raghav@xxxxxxxxxxx> filemap_create_folio() and do_read_cache_folio() were always allocating folio of order 0. __filemap_get_folio was trying to allocate higher order folios when fgp_flags had higher order hint set but it will default to order 0 folio if higher order memory allocation fails. As we bring the notion of mapping_min_order, make sure these functions allocate at least folio of mapping_min_order as we need to guarantee it in the page cache. Add some additional VM_BUG_ON() in page_cache_delete[batch] and __filemap_add_folio to catch errors where we delete or add folios that has order less than min_order. Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx> Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx> --- mm/filemap.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes
