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5555a5b9-x86-arm-remove-asm-spinlock-h.patch
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File 5555a5b9-x86-arm-remove-asm-spinlock-h.patch of Package xen
# Commit e62e49e6d5d4e8d22f3df0b75443ede65a812435 # Date 2015-05-15 09:52:25 +0200 # Author David Vrabel <david.vrabel@citrix.com> # Committer Jan Beulich <jbeulich@suse.com> x86,arm: remove asm/spinlock.h from all architectures Now that all architecture use a common ticket lock implementation for spinlocks, remove the architecture specific byte lock implementations. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Tim Deegan <tim@xen.org> Acked-by: Jan Beulich <jbeulich@suse.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> --- a/xen/arch/arm/README.LinuxPrimitives +++ b/xen/arch/arm/README.LinuxPrimitives @@ -25,16 +25,6 @@ linux/arch/arm64/include/asm/atomic.h --------------------------------------------------------------------- -spinlocks: last sync @ v3.16-rc6 (last commit: 95c4189689f9) - -linux/arch/arm64/include/asm/spinlock.h xen/include/asm-arm/arm64/spinlock.h - -Skipped: - 5686b06 arm64: lockref: add support for lockless lockrefs using cmpxchg - 52ea2a5 arm64: locks: introduce ticket-based spinlock implementation - ---------------------------------------------------------------------- - mem*: last sync @ v3.16-rc6 (last commit: d875c9b37240) linux/arch/arm64/lib/memchr.S xen/arch/arm/arm64/lib/memchr.S @@ -103,24 +93,6 @@ linux/arch/arm/include/asm/atomic.h --------------------------------------------------------------------- -spinlocks: last sync: 15e7e5c1ebf5 - -linux/arch/arm/include/asm/spinlock.h xen/include/asm-arm/arm32/spinlock.h - -*** Linux has switched to ticket locks but we still use bitlocks. - -resync to v3.14-rc7: - - 7c8746a ARM: 7955/1: spinlock: ensure we have a compiler barrier before sev - 0cbad9c ARM: 7854/1: lockref: add support for lockless lockrefs using cmpxchg64 - 9bb17be ARM: locks: prefetch the destination word for write prior to strex - 27a8479 ARM: smp_on_up: move inline asm ALT_SMP patching macro out of spinlock. - 00efaa0 ARM: 7812/1: rwlocks: retry trylock operation if strex fails on free lo - afa31d8 ARM: 7811/1: locks: use early clobber in arch_spin_trylock - 73a6fdc ARM: spinlock: use inner-shareable dsb variant prior to sev instruction - ---------------------------------------------------------------------- - mem*: last sync @ v3.16-rc6 (last commit: d98b90ea22b0) linux/arch/arm/lib/copy_template.S xen/arch/arm/arm32/lib/copy_template.S --- a/xen/include/asm-arm/arm32/spinlock.h +++ /dev/null @@ -1,66 +0,0 @@ -#ifndef __ASM_ARM32_SPINLOCK_H -#define __ASM_ARM32_SPINLOCK_H - -static inline void dsb_sev(void) -{ - __asm__ __volatile__ ( - "dsb\n" - "sev\n" - ); -} - -typedef struct { - volatile unsigned int lock; -} raw_spinlock_t; - -#define _RAW_SPIN_LOCK_UNLOCKED { 0 } - -#define _raw_spin_is_locked(x) ((x)->lock != 0) - -static always_inline void _raw_spin_unlock(raw_spinlock_t *lock) -{ - ASSERT(_raw_spin_is_locked(lock)); - - smp_mb(); - - __asm__ __volatile__( -" str %1, [%0]\n" - : - : "r" (&lock->lock), "r" (0) - : "cc"); - - dsb_sev(); -} - -static always_inline int _raw_spin_trylock(raw_spinlock_t *lock) -{ - unsigned long contended, res; - - do { - __asm__ __volatile__( - " ldrex %0, [%2]\n" - " teq %0, #0\n" - " strexeq %1, %3, [%2]\n" - " movne %1, #0\n" - : "=&r" (contended), "=r" (res) - : "r" (&lock->lock), "r" (1) - : "cc"); - } while (res); - - if (!contended) { - smp_mb(); - return 1; - } else { - return 0; - } -} - -#endif /* __ASM_SPINLOCK_H */ -/* - * Local variables: - * mode: C - * c-file-style: "BSD" - * c-basic-offset: 4 - * indent-tabs-mode: nil - * End: - */ --- a/xen/include/asm-arm/arm64/spinlock.h +++ /dev/null @@ -1,63 +0,0 @@ -/* - * Derived from Linux arch64 spinlock.h which is: - * Copyright (C) 2012 ARM Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#ifndef __ASM_ARM64_SPINLOCK_H -#define __ASM_ARM64_SPINLOCK_H - -typedef struct { - volatile unsigned int lock; -} raw_spinlock_t; - -#define _RAW_SPIN_LOCK_UNLOCKED { 0 } - -#define _raw_spin_is_locked(x) ((x)->lock != 0) - -static always_inline void _raw_spin_unlock(raw_spinlock_t *lock) -{ - ASSERT(_raw_spin_is_locked(lock)); - - asm volatile( - " stlr %w1, %0\n" - : "=Q" (lock->lock) : "r" (0) : "memory"); -} - -static always_inline int _raw_spin_trylock(raw_spinlock_t *lock) -{ - unsigned int tmp; - - asm volatile( - "2: ldaxr %w0, %1\n" - " cbnz %w0, 1f\n" - " stxr %w0, %w2, %1\n" - " cbnz %w0, 2b\n" - "1:\n" - : "=&r" (tmp), "+Q" (lock->lock) - : "r" (1) - : "cc", "memory"); - - return !tmp; -} - -#endif /* __ASM_SPINLOCK_H */ -/* - * Local variables: - * mode: C - * c-file-style: "BSD" - * c-basic-offset: 4 - * indent-tabs-mode: nil - * End: - */ --- a/xen/include/asm-arm/spinlock.h +++ /dev/null @@ -1,23 +0,0 @@ -#ifndef __ASM_SPINLOCK_H -#define __ASM_SPINLOCK_H - -#include <xen/config.h> -#include <xen/lib.h> - -#if defined(CONFIG_ARM_32) -# include <asm/arm32/spinlock.h> -#elif defined(CONFIG_ARM_64) -# include <asm/arm64/spinlock.h> -#else -# error "unknown ARM variant" -#endif - -#endif /* __ASM_SPINLOCK_H */ -/* - * Local variables: - * mode: C - * c-file-style: "BSD" - * c-basic-offset: 4 - * indent-tabs-mode: nil - * End: - */ --- a/xen/include/asm-x86/spinlock.h +++ /dev/null @@ -1,34 +0,0 @@ -#ifndef __ASM_SPINLOCK_H -#define __ASM_SPINLOCK_H - -#include <xen/config.h> -#include <xen/lib.h> -#include <asm/atomic.h> - -typedef struct { - volatile s16 lock; -} raw_spinlock_t; - -#define _RAW_SPIN_LOCK_UNLOCKED /*(raw_spinlock_t)*/ { 1 } - -#define _raw_spin_is_locked(x) ((x)->lock <= 0) - -static always_inline void _raw_spin_unlock(raw_spinlock_t *lock) -{ - ASSERT(_raw_spin_is_locked(lock)); - asm volatile ( - "movw $1,%0" - : "=m" (lock->lock) : : "memory" ); -} - -static always_inline int _raw_spin_trylock(raw_spinlock_t *lock) -{ - s16 oldval; - asm volatile ( - "xchgw %w0,%1" - :"=r" (oldval), "=m" (lock->lock) - :"0" ((s16)0) : "memory" ); - return (oldval > 0); -} - -#endif /* __ASM_SPINLOCK_H */ --- a/xen/include/xen/spinlock.h +++ b/xen/include/xen/spinlock.h @@ -2,7 +2,6 @@ #define __SPINLOCK_H__ #include <asm/system.h> -#include <asm/spinlock.h> #ifndef NDEBUG struct lock_debug {
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