Commit-ID: ee9ae257eb17d3426ee9ab91449a3aa443298b36
Gitweb: http://git.kernel.org/tip/ee9ae257eb17d3426ee9ab91449a3aa443298b36
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 12:21:59 +0200
x86/fpu: Remove 'xfeature_nr'
xfeature_nr ended up being initialized too late for me to
use it in the "xsave size sanity check" patch which is
later in the series. I tried to move around its initialization
but realized that it was just as easy to get rid of it.
We only have 9 XFEATURES. Instead of dynamically calculating
and storing the last feature, just use the compile-time max:
XFEATURES_NR_MAX. Note that even with 'xfeatures_nr' we can
had "holes" in the xfeatures_mask that we had to deal with.
We also change a 'leaf' variable to be a plain 'i'. Although
it is used to grab a cpuid leaf in this one loop, all of the
other loops just use an 'i' and I find it much more obvious
to keep the naming consistent across all the similar loops.
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/20150902233128.3F30DF5A@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/fpu/xstate.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index c1a0bf4..61ec60b 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -35,9 +35,6 @@ static unsigned int xstate_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] =
static unsigned int xstate_sizes[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};
static unsigned int xstate_comp_offsets[sizeof(xfeatures_mask)*8];
-/* The number of supported xfeatures in xfeatures_mask: */
-static unsigned int xfeatures_nr;
-
/*
* Clear all of the X86_FEATURE_* bits that are unavailable
* when the CPU has no XSAVE support.
@@ -190,23 +187,18 @@ void fpu__init_cpu_xstate(void)
/*
* Record the offsets and sizes of various xstates contained
* in the XSAVE state memory layout.
- *
- * ( Note that certain features might be non-present, for them
- * we'll have 0 offset and 0 size. )
*/
static void __init setup_xstate_features(void)
{
- u32 eax, ebx, ecx, edx, leaf;
-
- xfeatures_nr = fls64(xfeatures_mask);
+ u32 eax, ebx, ecx, edx, i;
- for (leaf = FIRST_EXTENDED_XFEATURE; leaf < xfeatures_nr; leaf++) {
- cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
+ cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
- xstate_offsets[leaf] = ebx;
- xstate_sizes[leaf] = eax;
+ xstate_offsets[i] = ebx;
+ xstate_sizes[i] = eax;
- printk(KERN_INFO "x86/fpu: xstate_offset[%d]: %4d, xstate_sizes[%d]: %4d\n", leaf, ebx, leaf, eax);
+ printk(KERN_INFO "x86/fpu: xstate_offset[%d]: %4d, xstate_sizes[%d]: %4d\n", i, ebx, i, eax);
}
}
@@ -252,7 +244,7 @@ static void __init setup_xstate_comp(void)
xstate_comp_offsets[1] = offsetof(struct fxregs_state, xmm_space);
if (!cpu_has_xsaves) {
- for (i = FIRST_EXTENDED_XFEATURE; i < xfeatures_nr; i++) {
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
xstate_comp_offsets[i] = xstate_offsets[i];
xstate_comp_sizes[i] = xstate_sizes[i];
@@ -264,7 +256,7 @@ static void __init setup_xstate_comp(void)
xstate_comp_offsets[FIRST_EXTENDED_XFEATURE] =
FXSAVE_SIZE + XSAVE_HDR_SIZE;
- for (i = FIRST_EXTENDED_XFEATURE; i < xfeatures_nr; i++) {
+ for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
if (test_bit(i, (unsigned long *)&xfeatures_mask))
xstate_comp_sizes[i] = xstate_sizes[i];
else
--
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