linux-kernel - [PATCH] mm/page_alloc.c: avoid inheritting current's flags when invoked in interrupt

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Date:   Tue, 15 Sep 2020 15:56:35 +0800
From:   <yanfei.xu@...driver.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/page_alloc.c: avoid inheritting current's flags when invoked in interrupt

From: Yanfei Xu <yanfei.xu@...driver.com>

alloc_mask shouldn't inherit the current task's flags when
__alloc_pages_nodemask is invoked in interrupt.

Signed-off-by: Yanfei Xu <yanfei.xu@...driver.com>
---
 mm/page_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fab5e97dc9ca..388b587b35a8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4889,7 +4889,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
 	 * from a particular context which has been marked by
 	 * memalloc_no{fs,io}_{save,restore}.
 	 */
-	alloc_mask = current_gfp_context(gfp_mask);
+	if (!in_interrupt())
+		alloc_mask = current_gfp_context(gfp_mask);
 	ac.spread_dirty_pages = false;
 
 	/*
-- 
2.18.2