linux-kernel - [PATCH] kmemleak: fix check for softirq context

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Message-Id: <20190517171507.96046-1-dvyukov@gmail.com>
Date:   Fri, 17 May 2019 19:15:07 +0200
From:   Dmitry Vyukov <dvyukov@...il.com>
To:     catalin.marinas@....com, akpm@...ux-foundation.org
Cc:     Dmitry Vyukov <dvyukov@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kmemleak: fix check for softirq context

From: Dmitry Vyukov <dvyukov@...gle.com>

in_softirq() is a wrong predicate to check if we are in a softirq context.
It also returns true if we have BH disabled, so objects are falsely
stamped with "softirq" comm. The correct predicate is in_serving_softirq().

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 mm/kmemleak.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index e57bf810f7983..6584ff9778895 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -588,7 +588,7 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
 	if (in_irq()) {
 		object->pid = 0;
 		strncpy(object->comm, "hardirq", sizeof(object->comm));
-	} else if (in_softirq()) {
+	} else if (in_serving_softirq()) {
 		object->pid = 0;
 		strncpy(object->comm, "softirq", sizeof(object->comm));
 	} else {
-- 
2.21.0.1020.gf2820cf01a-goog