Commit-ID: b2c5ea4f759190ee9f75687a00035c1a66d0d743 Gitweb: http://git.kernel.org/tip/b2c5ea4f759190ee9f75687a00035c1a66d0d743 Author: Wanpeng Li <[email protected]> AuthorDate: Mon, 7 Nov 2016 11:13:39 +0800 Committer: Thomas Gleixner <[email protected]> CommitDate: Wed, 9 Nov 2016 22:03:14 +0100
x86/msr: Add wrmsr_notrace() Required to remove the extra irq_enter()/irq_exit() in smp_reschedule_interrupt(). Suggested-by: Peter Zijlstra <[email protected]> Suggested-by: Paolo Bonzini <[email protected]> Signed-off-by: Wanpeng Li <[email protected]> Acked-by: Paolo Bonzini <[email protected]> Reviewed-by: Borislav Petkov <[email protected]> Cc: [email protected] Cc: Mike Galbraith <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]> --- arch/x86/include/asm/msr.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index b5fee97..9b0a232 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -115,17 +115,29 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr, } /* Can be uninlined because referenced by paravirt */ -notrace static inline void native_write_msr(unsigned int msr, +static notrace inline void __native_write_msr_notrace(unsigned int msr, unsigned low, unsigned high) { asm volatile("1: wrmsr\n" "2:\n" _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_unsafe) : : "c" (msr), "a"(low), "d" (high) : "memory"); +} + +/* Can be uninlined because referenced by paravirt */ +static notrace inline void native_write_msr(unsigned int msr, + unsigned low, unsigned high) +{ + __native_write_msr_notrace(msr, low, high); if (msr_tracepoint_active(__tracepoint_write_msr)) do_trace_write_msr(msr, ((u64)high << 32 | low), 0); } +static inline void wrmsr_notrace(unsigned msr, unsigned low, unsigned high) +{ + __native_write_msr_notrace(msr, low, high); +} + /* Can be uninlined because referenced by paravirt */ notrace static inline int native_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
