File 5555a5b9-x86-arm-remove-asm-spinlock-h.patch of Package xen

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File 5555a5b9-x86-arm-remove-asm-spinlock-h.patch of Package xen (Revision dbf2eede0f22d32a0cc48154739aa8fe)

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# 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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