Commit-ID: 8a93c9e0dca131a0bf330ea9d1e57c1bcf3824ad
Gitweb: http://git.kernel.org/tip/8a93c9e0dca131a0bf330ea9d1e57c1bcf3824ad
Author: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 2 Sep 2015 16:31:28 -0700
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 14 Sep 2015 12:21:58 +0200
x86/fpu: Rework XSTATE_* macros to remove magic '2'
The 'xstate.c' code has a bunch of references to '2'. This
is because we have a lot more work to do for the "extended"
xstates than the "legacy" ones and state component 2 is the
first "extended" state.
This patch replaces all of the instances of '2' with
FIRST_EXTENDED_XFEATURE, which clearly explains what is
going on.
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: dave@xxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20150902233128.A8C0BF51@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/fpu/types.h | 2 ++
arch/x86/kernel/fpu/xstate.c | 13 +++++++------
2 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index 8764df3..9f57930 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -126,6 +126,8 @@ enum xfeature {
| XFEATURE_MASK_ZMM_Hi256 \
| XFEATURE_MASK_Hi16_ZMM)
+#define FIRST_EXTENDED_XFEATURE XFEATURE_YMM
+
/*
* There are 16x 256-bit AVX registers named YMM0-YMM15.
* The low 128 bits are aliased to the 16 SSE registers (XMM0-XMM15)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index f94e236..c1a0bf4 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -200,7 +200,7 @@ static void __init setup_xstate_features(void)
xfeatures_nr = fls64(xfeatures_mask);
- for (leaf = 2; leaf < xfeatures_nr; leaf++) {
+ for (leaf = FIRST_EXTENDED_XFEATURE; leaf < xfeatures_nr; leaf++) {
cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
xstate_offsets[leaf] = ebx;
@@ -252,7 +252,7 @@ static void __init setup_xstate_comp(void)
xstate_comp_offsets[1] = offsetof(struct fxregs_state, xmm_space);
if (!cpu_has_xsaves) {
- for (i = 2; i < xfeatures_nr; i++) {
+ for (i = FIRST_EXTENDED_XFEATURE; i < xfeatures_nr; i++) {
if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
xstate_comp_offsets[i] = xstate_offsets[i];
xstate_comp_sizes[i] = xstate_sizes[i];
@@ -261,15 +261,16 @@ static void __init setup_xstate_comp(void)
return;
}
- xstate_comp_offsets[2] = FXSAVE_SIZE + XSAVE_HDR_SIZE;
+ xstate_comp_offsets[FIRST_EXTENDED_XFEATURE] =
+ FXSAVE_SIZE + XSAVE_HDR_SIZE;
- for (i = 2; i < xfeatures_nr; i++) {
+ for (i = FIRST_EXTENDED_XFEATURE; i < xfeatures_nr; i++) {
if (test_bit(i, (unsigned long *)&xfeatures_mask))
xstate_comp_sizes[i] = xstate_sizes[i];
else
xstate_comp_sizes[i] = 0;
- if (i > 2)
+ if (i > FIRST_EXTENDED_XFEATURE)
xstate_comp_offsets[i] = xstate_comp_offsets[i-1]
+ xstate_comp_sizes[i-1];
@@ -325,7 +326,7 @@ static unsigned int __init calculate_xstate_size(void)
}
calculated_xstate_size = FXSAVE_SIZE + XSAVE_HDR_SIZE;
- for (i = 2; i < 64; i++) {
+ for (i = FIRST_EXTENDED_XFEATURE; i < 64; i++) {
if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
calculated_xstate_size += eax;
--
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