Commit-ID: 39ca5fb4920a96eeab478be2cfa6a2369fef6b02
Gitweb: https://git.kernel.org/tip/39ca5fb4920a96eeab478be2cfa6a2369fef6b02
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Mon, 1 Jul 2019 19:33:54 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Nadav Amit <namit@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20190701173354.2pe62hhliok2afea@xxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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);
|