linux-kernel - [PATCH 3/3] mm/mempool: use might

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Message-Id: <20220605152539.3196045-3-daniel.vetter@ffwll.ch>
Date:   Sun,  5 Jun 2022 17:25:39 +0200
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: [PATCH 3/3] mm/mempool: use might_alloc()

mempool are generally used for GFP_NOIO, so this wont benefit all that
much because might_alloc currently only checks GFP_NOFS. But it does
validate against mmu notifier pte zapping, some might catch some
drivers doing really silly things, plus it's a bit more meaningful in
what we're checking for here.

Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
---
 mm/mempool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mempool.c b/mm/mempool.c
index b933d0fc21b8..96488b13a1ef 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -379,7 +379,7 @@ void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
 	gfp_t gfp_temp;
 
 	VM_WARN_ON_ONCE(gfp_mask & __GFP_ZERO);
-	might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM);
+	might_alloc(gfp_mask);
 
 	gfp_mask |= __GFP_NOMEMALLOC;	/* don't allocate emergency reserves */
 	gfp_mask |= __GFP_NORETRY;	/* don't loop in __alloc_pages */
-- 
2.36.0