Commit-ID: 36fd4f0249f8cb445835acb7c6937a0ffa2b5f14 Gitweb: http://git.kernel.org/tip/36fd4f0249f8cb445835acb7c6937a0ffa2b5f14 Author: Andy Lutomirski <[email protected]> AuthorDate: Mon, 31 Oct 2016 15:18:42 -0700 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 1 Nov 2016 07:47:53 +0100
x86/fpu: Get rid of two redundant clts() calls CR0.TS is cleared by a direct CR0 write in fpu__init_cpu_generic(). We don't need to call clts() two more times right after that. Signed-off-by: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: Fenghua Yu <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Quentin Casasnovas <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Rusty Russell <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: kvm list <[email protected]> Link: http://lkml.kernel.org/r/476d2d5066eda24838853426ea74c94140b50c85.1477951965.git.l...@kernel.org Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/kernel/fpu/init.c | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c index 1a09d13..60dece3 100644 --- a/arch/x86/kernel/fpu/init.c +++ b/arch/x86/kernel/fpu/init.c @@ -10,15 +10,6 @@ #include <linux/init.h> /* - * Initialize the TS bit in CR0 according to the style of context-switches - * we are using: - */ -static void fpu__init_cpu_ctx_switch(void) -{ - clts(); -} - -/* * Initialize the registers found in all CPUs, CR0 and CR4: */ static void fpu__init_cpu_generic(void) @@ -55,7 +46,6 @@ void fpu__init_cpu(void) { fpu__init_cpu_generic(); fpu__init_cpu_xstate(); - fpu__init_cpu_ctx_switch(); } /* @@ -290,14 +280,6 @@ void __init fpu__init_system(struct cpuinfo_x86 *c) */ fpu__init_cpu(); - /* - * But don't leave CR0::TS set yet, as some of the FPU setup - * methods depend on being able to execute FPU instructions - * that will fault on a set TS, such as the FXSAVE in - * fpu__init_system_mxcsr(). - */ - clts(); - fpu__init_system_generic(); fpu__init_system_xstate_size_legacy(); fpu__init_system_xstate();
