linux-kernel - [tip:x86/urgent] x86/ldt: Initialize the context lock for init

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Date:   Tue, 9 Jul 2019 05:02:49 -0700
From:   tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, luto@...nel.org,
        linux-kernel@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de,
        bigeasy@...utronix.de, namit@...are.com
Subject: [tip:x86/urgent] x86/ldt: Initialize the context lock for init_mm

Commit-ID:  39ca5fb4920a96eeab478be2cfa6a2369fef6b02
Gitweb:     https://git.kernel.org/tip/39ca5fb4920a96eeab478be2cfa6a2369fef6b02
Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate: Mon, 1 Jul 2019 19:33:54 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 9 Jul 2019 13:57:27 +0200

x86/ldt: Initialize the context lock for init_mm

The mutex mm->context->lock for init_mm is not initialized for init_mm.
This wasn't a problem because it remained unused. This changed however
since commit
	4fc19708b165c ("x86/alternatives: Initialize temporary mm for patching")

Initialize the mutex for init_mm.

Fixes: 4fc19708b165c ("x86/alternatives: Initialize temporary mm for patching")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Nadav Amit <namit@...are.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Link: https://lkml.kernel.org/r/20190701173354.2pe62hhliok2afea@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/mmu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h
index 5ff3e8af2c20..e78c7db87801 100644
--- a/arch/x86/include/asm/mmu.h
+++ b/arch/x86/include/asm/mmu.h
@@ -59,6 +59,7 @@ typedef struct {
 #define INIT_MM_CONTEXT(mm)						\
 	.context = {							\
 		.ctx_id = 1,						\
+		.lock = __MUTEX_INITIALIZER(mm.context.lock),		\
 	}
 
 void leave_mm(int cpu);