linux-kernel - [PATCH 2/3] kernel/fork: use vfree

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Date:   Tue, 8 Nov 2016 18:05:44 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Christoph Hellwig <hch@....de>
CC:     Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        <linux-rt-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Andrey Ryabinin" <aryabinin@...tuozzo.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Joel Fernandes" <joelaf@...gle.com>,
        Jisheng Zhang <jszhang@...vell.com>,
        "Chris Wilson" <chris@...is-wilson.co.uk>,
        John Dias <joaodias@...gle.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>
Subject: [PATCH 2/3] kernel/fork: use vfree_atomic() to free thread stack

vfree() is going to use sleeping lock. Thread stack freed in atomic
context, therefore we must use vfree_atomic() here.

Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Joel Fernandes <joelaf@...gle.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Jisheng Zhang <jszhang@...vell.com>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: John Dias <joaodias@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
---
 kernel/fork.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index fd85c68..417e94f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -229,7 +229,7 @@ static inline void free_thread_stack(struct task_struct *tsk)
 		}
 		local_irq_restore(flags);
 
-		vfree(tsk->stack);
+		vfree_atomic(tsk->stack);
 		return;
 	}
 #endif
-- 
2.7.3