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Subject[tip: x86/urgent] x86: __always_inline __{rd,wr}msr()
The following commit has been merged into the x86/urgent branch of tip:

Commit-ID: 66a425011c61e71560c234492d204e83cfb73d1d
Gitweb: https://git.kernel.org/tip/66a425011c61e71560c234492d204e83cfb73d1d
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Thu, 07 Jan 2021 11:14:25 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 12 Jan 2021 21:10:59 +01:00

x86: __always_inline __{rd,wr}msr()

When the compiler choses to not inline the trivial MSR helpers:

vmlinux.o: warning: objtool: __sev_es_nmi_complete()+0xce: call to __wrmsr.constprop.14() leaves .noinstr.text section

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Link: https://lore.kernel.org/r/X/bf3gV+BW7kGEsB@hirez.programming.kicks-ass.net

---
arch/x86/include/asm/msr.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 0b4920a..e16cccd 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -86,7 +86,7 @@ static inline void do_trace_rdpmc(unsigned int msr, u64 val, int failed) {}
* think of extending them - you will be slapped with a stinking trout or a frozen
* shark will reach you, wherever you are! You've been warned.
*/
-static inline unsigned long long notrace __rdmsr(unsigned int msr)
+static __always_inline unsigned long long __rdmsr(unsigned int msr)
{
DECLARE_ARGS(val, low, high);

@@ -98,7 +98,7 @@ static inline unsigned long long notrace __rdmsr(unsigned int msr)
return EAX_EDX_VAL(val, low, high);
}

-static inline void notrace __wrmsr(unsigned int msr, u32 low, u32 high)
+static __always_inline void __wrmsr(unsigned int msr, u32 low, u32 high)
{
asm volatile("1: wrmsr\n"
"2:\n"
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