Commit-ID: b2c5ea4f759190ee9f75687a00035c1a66d0d743 Gitweb: http://git.kernel.org/tip/b2c5ea4f759190ee9f75687a00035c1a66d0d743 Author: Wanpeng Li <wanpeng...@hotmail.com> AuthorDate: Mon, 7 Nov 2016 11:13:39 +0800 Committer: Thomas Gleixner <t...@linutronix.de> 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 <pet...@infradead.org> Suggested-by: Paolo Bonzini <pbonz...@redhat.com> Signed-off-by: Wanpeng Li <wanpeng...@hotmail.com> Acked-by: Paolo Bonzini <pbonz...@redhat.com> Reviewed-by: Borislav Petkov <b...@alien8.de> Cc: k...@vger.kernel.org Cc: Mike Galbraith <efa...@gmx.de> Link: http://lkml.kernel.org/r/1478488420-5982-2-git-send-email-wanpeng...@hotmail.com Signed-off-by: Thomas Gleixner <t...@linutronix.de> --- 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)
