From: tip-bot for Dave Hansen <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, bp@alien8.de,
torvalds@linux-foundation.org, luto@amacapital.net,
fenghua.yu@intel.com, tglx@linutronix.de, brgerst@gmail.com,
peterz@infradead.org, dvlasenk@redhat.com, mingo@kernel.org,
hpa@zytor.com, tim.c.chen@linux.intel.com,
dave.hansen@linux.intel.com
Subject: [tip:x86/fpu] x86/fpu: Remove 'xfeature_nr'
Date: Mon, 14 Sep 2015 05:22:12 -0700 [thread overview]
Message-ID: <tip-ee9ae257eb17d3426ee9ab91449a3aa443298b36@git.kernel.org> (raw)
In-Reply-To: <20150902233128.3F30DF5A@viggo.jf.intel.com>
Commit-ID: ee9ae257eb17d3426ee9ab91449a3aa443298b36
Gitweb: http://git.kernel.org/tip/ee9ae257eb17d3426ee9ab91449a3aa443298b36
Author: Dave Hansen <dave.hansen@linux.intel.com>
AuthorDate: Wed, 2 Sep 2015 16:31:28 -0700
Committer: Ingo Molnar <mingo@kernel.org>
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@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: dave@sr71.net
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20150902233128.3F30DF5A@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
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
next prev parent reply other threads:[~2015-09-14 12:23 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-02 23:31 [PATCH 00/15] [v4] x86, fpu: XSAVE cleanups and sanity checks Dave Hansen
2015-09-02 23:31 ` [PATCH 02/15] x86, fpu: move XSAVE-disabling code to a helper Dave Hansen
2015-09-14 12:19 ` [tip:x86/fpu] x86/fpu: Move " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 01/15] x86, fpu: print xfeature buffer size in decimal Dave Hansen
2015-09-14 12:19 ` [tip:x86/fpu] x86/fpu: Print " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 04/15] x86, fpu: kill LWP support Dave Hansen
2015-09-14 12:20 ` [tip:x86/fpu] x86/fpu: Remove partial LWP support definitions tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 03/15] x86, fpu: remove XSTATE_RESERVE Dave Hansen
2015-09-14 12:20 ` [tip:x86/fpu] x86/fpu: Remove XSTATE_RESERVE tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 05/15] x86, fpu: XSAVE macro renames Dave Hansen
2015-09-14 12:21 ` [tip:x86/fpu] x86/fpu: Rename XSAVE macros tip-bot for Dave Hansen
2015-09-23 10:49 ` Borislav Petkov
2015-09-24 7:24 ` [tip:x86/fpu] x86/fpu: Fixup uninitialized feature_name warning tip-bot for Borislav Petkov
2015-09-02 23:31 ` [PATCH 06/15] x86, fpu: rename XFEATURES_NR_MAX Dave Hansen
2015-09-14 12:21 ` [tip:x86/fpu] x86/fpu: Rename XFEATURES_NR_MAX tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 07/15] x86, fpu: rework XSTATE_* macros to remove magic '2' Dave Hansen
2015-09-14 12:21 ` [tip:x86/fpu] x86/fpu: Rework " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 08/15] x86, fpu: remove xfeature_nr Dave Hansen
2015-09-14 12:22 ` tip-bot for Dave Hansen [this message]
2015-09-02 23:31 ` [PATCH 11/15] x86, fpu: rework YMM definition Dave Hansen
2015-09-14 12:23 ` [tip:x86/fpu] x86/fpu: Rework " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 10/15] x86, fpu: rework MPX 'xstate' types Dave Hansen
2015-09-14 12:22 ` [tip:x86/fpu] x86/fpu/mpx: Rework " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 09/15] x86, fpu: add helper xfeature_enabled() instead of test_bit() Dave Hansen
2015-09-14 12:22 ` [tip:x86/fpu] x86/fpu: Add xfeature_enabled() helper " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 12/15] x86, fpu: add C structures for AVX-512 state components Dave Hansen
2015-09-14 12:23 ` [tip:x86/fpu] x86/fpu: Add " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 13/15] x86, fpu: correct and check XSAVE xstate size calculations Dave Hansen
2015-09-14 12:23 ` [tip:x86/fpu] x86/fpu: Correct " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 14/15] x86, fpu: check to ensure increasing-offset xstate offsets Dave Hansen
2015-09-14 12:24 ` [tip:x86/fpu] x86/fpu: Check " tip-bot for Dave Hansen
2015-09-02 23:31 ` [PATCH 15/15] x86, fpu: check CPU-provided sizes against struct declarations Dave Hansen
2015-09-14 12:24 ` [tip:x86/fpu] x86/fpu: Check " tip-bot for Dave Hansen
2015-09-14 10:07 ` [PATCH 00/15] [v4] x86, fpu: XSAVE cleanups and sanity checks Ingo Molnar
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