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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 1 Jul 2019 17:53:13 +0200
Subject: [PATCH] x86/ldt: Initialize the context lock for init_mm
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.9-rt3.tar.xz
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@linutronix.de>
---
arch/x86/include/asm/mmu.h | 1 +
1 file changed, 1 insertion(+)
--- 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);
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