The patch titled
spin_lock_irq: Enable interrupts while spinning: x86_64 implementation
has been added to the -mm tree. Its filename is
spin_lock_irq-enable-interrupts-while-spinning-x86_64-implementation.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: spin_lock_irq: Enable interrupts while spinning: x86_64 implementation
From: Ravikiran G Thirumalai <kiran@xxxxxxxxxxxx>
Implement interrupt enabling while spinning for lock for spin_lock_irq
Signed-off by: Pravin B. Shelar <pravin.shelar@xxxxxxxxxxxxxx>
Signed-off by: Ravikiran Thirumalai <kiran@xxxxxxxxxxxx>
Signed-off by: Shai Fultheim <shai@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Michael Davidson <md@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-x86_64/spinlock.h | 16 +++++++++++++++-
1 files changed, 15 insertions(+), 1 deletion(-)
diff -puN include/asm-x86_64/spinlock.h~spin_lock_irq-enable-interrupts-while-spinning-x86_64-implementation include/asm-x86_64/spinlock.h
--- a/include/asm-x86_64/spinlock.h~spin_lock_irq-enable-interrupts-while-spinning-x86_64-implementation
+++ a/include/asm-x86_64/spinlock.h
@@ -63,7 +63,21 @@ static inline void __raw_spin_lock_flags
"5:\n\t"
: "+m" (lock->slock) : "r" ((unsigned)flags) : "memory");
}
-#define __raw_spin_lock_irq(lock) __raw_spin_lock(lock)
+static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
+{
+ asm volatile(
+ "\n1:\t"
+ LOCK_PREFIX " ; decl %0\n\t"
+ "jns 2f\n"
+ "sti\n" /* Enable interrupts during spin */
+ "3:\n"
+ "rep;nop\n\t"
+ "cmpl $0,%0\n\t"
+ "jle 3b\n\t"
+ "cli\n"
+ "jmp 1b\n"
+ "2:\t" : "+m" (lock->slock) : : "memory");
+}
#endif
static inline int __raw_spin_trylock(raw_spinlock_t *lock)
_
Patches currently in -mm which might be from kiran@xxxxxxxxxxxx are
x86-fix-dev_to_node-for-x86-and-x86_64.patch
mm-set-hashdist_default-to-1-for-x86_64-numa.patch
spin_lock_irq-enable-interrupts-while-spinning-preparatory-patch.patch
spin_lock_irq-enable-interrupts-while-spinning-x86_64-implementation.patch
spin_lock_irq-enable-interrupts-while-spinning-i386-implementation.patch
slab-leaks3-default-y.patch
-
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