linux-kernel - [tip:x86/fpu] x86/fpu/xstate: Move XSAVES state init to a function

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Date:   Wed, 25 Jan 2017 00:31:53 -0800
From:   tip-bot for Yu-cheng Yu <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, fenghua.yu@...el.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        ravi.v.shankar@...el.com, mingo@...nel.org, hpa@...or.com,
        yu-cheng.yu@...el.com, dave.hansen@...ux.intel.com,
        riel@...hat.com, bp@...en8.de, luto@...nel.org, tglx@...utronix.de,
        oleg@...hat.com
Subject: [tip:x86/fpu] x86/fpu/xstate: Move XSAVES state init to a function

Commit-ID:  a5828ed3d03d38399159dc17a98cefde3109a66b
Gitweb:     http://git.kernel.org/tip/a5828ed3d03d38399159dc17a98cefde3109a66b
Author:     Yu-cheng Yu <yu-cheng.yu@...el.com>
AuthorDate: Tue, 24 Jan 2017 10:25:46 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 25 Jan 2017 08:25:12 +0100

x86/fpu/xstate: Move XSAVES state init to a function

Make XSTATE init similar to existing code; move it to a separate function.
There is no functionality change.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ravi V. Shankar <ravi.v.shankar@...el.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1485282346-15437-1-git-send-email-yu-cheng.yu@intel.com
[ Minor cleanliness edits. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/fpu/internal.h | 10 ++++++++++
 arch/x86/kernel/fpu/core.c          |  9 +--------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index d4a6849..255645f 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -87,6 +87,16 @@ extern void fpstate_init_soft(struct swregs_state *soft);
 #else
 static inline void fpstate_init_soft(struct swregs_state *soft) {}
 #endif
+
+static inline void fpstate_init_xstate(struct xregs_state *xsave)
+{
+	/*
+	 * XRSTORS requires these bits set in xcomp_bv, or it will
+	 * trigger #GP:
+	 */
+	xsave->header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT | xfeatures_mask;
+}
+
 static inline void fpstate_init_fxstate(struct fxregs_state *fx)
 {
 	fx->cwd = 0x37f;
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index de72344..e1114f0 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -9,7 +9,6 @@
 #include <asm/fpu/regset.h>
 #include <asm/fpu/signal.h>
 #include <asm/fpu/types.h>
-#include <asm/fpu/xstate.h>
 #include <asm/traps.h>
 
 #include <linux/hardirq.h>
@@ -179,14 +178,8 @@ void fpstate_init(union fpregs_state *state)
 
 	memset(state, 0, fpu_kernel_xstate_size);
 
-	/*
-	 * XRSTORS requires that this bit is set in xcomp_bv, or
-	 * it will #GP. Make sure it is replaced after the memset().
-	 */
 	if (static_cpu_has(X86_FEATURE_XSAVES))
-		state->xsave.header.xcomp_bv = XCOMP_BV_COMPACTED_FORMAT |
-					       xfeatures_mask;
-
+		fpstate_init_xstate(&state->xsave);
 	if (static_cpu_has(X86_FEATURE_FXSR))
 		fpstate_init_fxstate(&state->fxsave);
 	else