There's only 8 xstate bits at the moment, and it's not like we
can support unknown bits - so put xstate_offsets[] and
xstate_sizes[] into static allocation.
This is in preparation to be able to call the FPU init code
earlier, when there's no bootmem available yet.
Reviewed-by: Borislav Petkov <b...@alien8.de>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Fenghua Yu <fenghua...@intel.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Oleg Nesterov <o...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
arch/x86/include/asm/fpu/xsave.h | 3 +++
arch/x86/kernel/fpu/xsave.c | 4 +---
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xsave.h b/arch/x86/include/asm/fpu/xsave.h
index b27b4466f88d..fd564344783e 100644
--- a/arch/x86/include/asm/fpu/xsave.h
+++ b/arch/x86/include/asm/fpu/xsave.h
@@ -15,6 +15,9 @@
#define XSTATE_ZMM_Hi256 0x40
#define XSTATE_Hi16_ZMM 0x80
+/* The highest xstate bit above (of XSTATE_Hi16_ZMM): */
+#define XFEATURES_NR_MAX 8
+
#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
#define XSTATE_AVX512 (XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
/* Bit 63 of XCR0 is reserved for future expansion */
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c
index f3d30f0c50f9..adeab16655ae 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -23,7 +23,7 @@ u64 xfeatures_mask;
struct xsave_struct *init_xstate_buf;
static struct _fpx_sw_bytes fx_sw_reserved, fx_sw_reserved_ia32;
-static unsigned int *xstate_offsets, *xstate_sizes;
+static unsigned int xstate_offsets[XFEATURES_NR_MAX],
xstate_sizes[XFEATURES_NR_MAX];
static unsigned int xstate_comp_offsets[sizeof(xfeatures_mask)*8];
/* The number of supported xfeatures in xfeatures_mask: */
@@ -478,8 +478,6 @@ static void __init setup_xstate_features(void)
int eax, ebx, ecx, edx, leaf = 0x2;
xfeatures_nr = fls64(xfeatures_mask);
- xstate_offsets = alloc_bootmem(xfeatures_nr * sizeof(int));
- xstate_sizes = alloc_bootmem(xfeatures_nr * sizeof(int));
do {
cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
--
2.1.0
--
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