Revision 4a133eb351ccc275683ad49305d0b04dde903733 authored by Christophe Leroy on 27 August 2020, 18:30:27 UTC, committed by Michael Ellerman on 28 August 2020, 02:03:18 UTC
low_sleep_handler() can't restore the context from virtual stack because the stack can hardly be accessed with MMU OFF. For now, disable VMAP stack when CONFIG_ADB_PMU is selected. Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STACK") Cc: stable@vger.kernel.org # v5.6+ Reported-by: Giuseppe Sacco <giuseppe@sguazz.it> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ec96c15bfa1a7415ab604ee1c98cd45779c08be0.1598553015.git.christophe.leroy@csgroup.eu
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x86.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* ----------------------------------------------------------------------- *
*
* Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
*
* ----------------------------------------------------------------------- */
/*
* raid6/x86.h
*
* Definitions common to x86 and x86-64 RAID-6 code only
*/
#ifndef LINUX_RAID_RAID6X86_H
#define LINUX_RAID_RAID6X86_H
#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
#ifdef __KERNEL__ /* Real code */
#include <asm/fpu/api.h>
#else /* Dummy code for user space testing */
static inline void kernel_fpu_begin(void)
{
}
static inline void kernel_fpu_end(void)
{
}
#define __aligned(x) __attribute__((aligned(x)))
#define X86_FEATURE_MMX (0*32+23) /* Multimedia Extensions */
#define X86_FEATURE_FXSR (0*32+24) /* FXSAVE and FXRSTOR instructions
* (fast save and restore) */
#define X86_FEATURE_XMM (0*32+25) /* Streaming SIMD Extensions */
#define X86_FEATURE_XMM2 (0*32+26) /* Streaming SIMD Extensions-2 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* "pni" SSE-3 */
#define X86_FEATURE_SSSE3 (4*32+ 9) /* Supplemental SSE-3 */
#define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */
#define X86_FEATURE_AVX2 (9*32+ 5) /* AVX2 instructions */
#define X86_FEATURE_AVX512F (9*32+16) /* AVX-512 Foundation */
#define X86_FEATURE_AVX512DQ (9*32+17) /* AVX-512 DQ (Double/Quad granular)
* Instructions
*/
#define X86_FEATURE_AVX512BW (9*32+30) /* AVX-512 BW (Byte/Word granular)
* Instructions
*/
#define X86_FEATURE_AVX512VL (9*32+31) /* AVX-512 VL (128/256 Vector Length)
* Extensions
*/
#define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */
/* Should work well enough on modern CPUs for testing */
static inline int boot_cpu_has(int flag)
{
u32 eax, ebx, ecx, edx;
eax = (flag & 0x100) ? 7 :
(flag & 0x20) ? 0x80000001 : 1;
ecx = 0;
asm volatile("cpuid"
: "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
return ((flag & 0x100 ? ebx :
(flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
}
#endif /* ndef __KERNEL__ */
#endif
#endif
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