| Message ID | 20180422162512.458372618@linutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
--- a/drivers/md/dm-verity-fec.c +++ b/drivers/md/dm-verity-fec.c @@ -570,7 +570,7 @@ static void *fec_rs_alloc(gfp_t gfp_mask { struct dm_verity *v = (struct dm_verity *)pool_data; - return init_rs(8, 0x11d, 0, 1, v->fec->roots); + return init_rs_gfp(8, 0x11d, 0, 1, v->fec->roots, gfp_mask); } static void fec_rs_free(void *element, void *pool_data)
Allocations from the rs_pool can invoke init_rs() from the mempool allocation callback. This is problematic in fec_alloc_bufs() which invokes mempool_alloc() with GFP_NOIO to prevent a swap deadlock because init_rs() uses GFP_KERNEL allocations. Switch it to init_rs_gfp() and invoke it with the gfp_t flags which are handed in from the allocator. Note: This is not a problem today because the rs control struct is shared between the instances and its created when the mempool is initialized. But the upcoming changes which switch to a rs_control struct per instance to embed decoder buffers will trigger the swap vs. GFP_KERNEL issue. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Snitzer <snitzer@redhat.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: Neil Brown <neilb@suse.com> --- drivers/md/dm-verity-fec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)