[tip:x86/fpu] x86/fpu: Get rid of two redundant clts() calls

[tip-bot for Andy Lutomirski]

Commit-ID:  36fd4f0249f8cb445835acb7c6937a0ffa2b5f14
Gitweb: http://git.kernel.org/tip/36fd4f0249f8cb445835acb7c6937a0ffa2b5f14
Author: Andy Lutomirski 
AuthorDate: Mon, 31 Oct 2016 15:18:42 -0700
Committer:  Ingo Molnar 
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 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Dave Hansen 
Cc: Denys Vlasenko 
Cc: Fenghua Yu 
Cc: H. Peter Anvin 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Cc: Oleg Nesterov 
Cc: Paolo Bonzini 
Cc: Peter Zijlstra 
Cc: Quentin Casasnovas 
Cc: Rik van Riel 
Cc: Rusty Russell 
Cc: Thomas Gleixner 
Cc: kvm list 
Link: 
http://lkml.kernel.org/r/476d2d5066eda24838853426ea74c94140b50c85.1477951965.git.l...@kernel.org
Signed-off-by: Ingo Molnar 
---
 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 
 
 /*
- * 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();

[tip:x86/fpu] x86/fpu: Get rid of two redundant clts() calls

[tip-bot for Andy Lutomirski]

Commit-ID:  36fd4f0249f8cb445835acb7c6937a0ffa2b5f14
Gitweb: http://git.kernel.org/tip/36fd4f0249f8cb445835acb7c6937a0ffa2b5f14
Author: Andy Lutomirski 
AuthorDate: Mon, 31 Oct 2016 15:18:42 -0700
Committer:  Ingo Molnar 
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 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Dave Hansen 
Cc: Denys Vlasenko 
Cc: Fenghua Yu 
Cc: H. Peter Anvin 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Cc: Oleg Nesterov 
Cc: Paolo Bonzini 
Cc: Peter Zijlstra 
Cc: Quentin Casasnovas 
Cc: Rik van Riel 
Cc: Rusty Russell 
Cc: Thomas Gleixner 
Cc: kvm list 
Link: 
http://lkml.kernel.org/r/476d2d5066eda24838853426ea74c94140b50c85.1477951965.git.l...@kernel.org
Signed-off-by: Ingo Molnar 
---
 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 
 
 /*
- * 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();