On Wed, Dec 11, 2024 at 08:25:37PM +0000, Matthew Wilcox (Oracle) wrote: > If the caller of vmap() specifies VM_MAP_PUT_PAGES (currently only the > i915 driver), we will decrement nr_vmalloc_pages and MEMCG_VMALLOC in > vfree(). These counters are incremented by vmalloc() but not by vmap() > so this will cause an underflow. Check the VM_MAP_PUT_PAGES flag before > decrementing either counter. > > Fixes: b944afc9d64d (mm: add a VM_MAP_PUT_PAGES flag for vmap) > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Nice, thanks, looks good to me.
