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authorPeter Zijlstra <peterz@infradead.org>2021-01-25 16:26:50 +0100
committerIngo Molnar <mingo@kernel.org>2021-02-17 14:12:42 +0100
commitef72661e28c64ad610f89acc2832ec67b27ba438 (patch)
treea68805ca80c0cc424cda83ae3100fd016f7a8793 /arch/x86/include
parent73f44fe19d359635a607e8e8daa0da4001c1cfc2 (diff)
downloadlinux-ef72661e28c64ad610f89acc2832ec67b27ba438.tar.gz
sched: Harden PREEMPT_DYNAMIC
Use the new EXPORT_STATIC_CALL_TRAMP() / static_call_mod() to unexport the static_call_key for the PREEMPT_DYNAMIC calls such that modules can no longer update these calls. Having modules change/hi-jack the preemption calls would be horrible. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/preempt.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
index 9b12dce9bda5..0aa96f824af1 100644
--- a/arch/x86/include/asm/preempt.h
+++ b/arch/x86/include/asm/preempt.h
@@ -114,7 +114,7 @@ DECLARE_STATIC_CALL(preempt_schedule, __preempt_schedule_func);
#define __preempt_schedule() \
do { \
- __ADDRESSABLE(STATIC_CALL_KEY(preempt_schedule)); \
+ __STATIC_CALL_MOD_ADDRESSABLE(preempt_schedule); \
asm volatile ("call " STATIC_CALL_TRAMP_STR(preempt_schedule) : ASM_CALL_CONSTRAINT); \
} while (0)
@@ -127,7 +127,7 @@ DECLARE_STATIC_CALL(preempt_schedule_notrace, __preempt_schedule_notrace_func);
#define __preempt_schedule_notrace() \
do { \
- __ADDRESSABLE(STATIC_CALL_KEY(preempt_schedule_notrace)); \
+ __STATIC_CALL_MOD_ADDRESSABLE(preempt_schedule_notrace); \
asm volatile ("call " STATIC_CALL_TRAMP_STR(preempt_schedule_notrace) : ASM_CALL_CONSTRAINT); \
} while (0)