Messages in this thread Patch in this message | | | Date | Sat, 1 May 2004 18:21:04 -0400 (EDT) | From | Zwane Mwaikambo <> | Subject | Re: [PATCH][2.6-mm] Allow i386 to reenable interrupts on lock contention |
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On Sat, 1 May 2004, Andrew Morton wrote:
> Could we move all the irq-handling stuff into the out-of-line section, to > keep the fast-path cache footprint smaller?
Of course, oversight on my part. Done and restested.
Index: linux-2.6.6-rc3-mm1/include/asm-i386/spinlock.h =================================================================== RCS file: /home/cvsroot/linux-2.6.6-rc3-mm1/include/asm-i386/spinlock.h,v retrieving revision 1.1.1.1 diff -u -p -B -r1.1.1.1 spinlock.h --- linux-2.6.6-rc3-mm1/include/asm-i386/spinlock.h 1 May 2004 08:19:15 -0000 1.1.1.1 +++ linux-2.6.6-rc3-mm1/include/asm-i386/spinlock.h 1 May 2004 21:53:36 -0000 @@ -42,7 +42,6 @@ typedef struct {
#define spin_is_locked(x) (*(volatile signed char *)(&(x)->lock) <= 0) #define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x)) -#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
#ifdef CONFIG_SPINLINE
@@ -58,6 +57,21 @@ typedef struct { "jmp 1b\n" \ "3:\t"
+ #define spin_lock_string_flags \ + "\n1:\t" \ + "lock ; decb %0\n\t" \ + "jns 3f\n" \ + "testl $0x200, %1\n\t" \ + "jz 2f\n\t" \ + "sti\n\t" \ + "2:\t" \ + "rep;nop\n\t" \ + "cmpb $0, %0\n\t" \ + "jle 2b\n\t" \ + "cli\n\t" \ + "jmp 1b\n" \ + "3:\t" + #else /* !CONFIG_SPINLINE */
#define spin_lock_string \ @@ -72,6 +86,23 @@ typedef struct { "jmp 1b\n" \ LOCK_SECTION_END
+ #define spin_lock_string_flags \ + "\n1:\t" \ + "lock ; decb %0\n\t" \ + "js 2f\n\t" \ + LOCK_SECTION_START("") \ + "2:\t" \ + "testl $0x200, %1\n\t" \ + "jz 3f\n\t" \ + "sti\n\t" \ + "3:\t" \ + "rep;nop\n\t" \ + "cmpb $0, %0\n\t" \ + "jle 3b\n\t" \ + "cli\n\t" \ + "jmp 1b\n" \ + LOCK_SECTION_END + #endif /* CONFIG_SPINLINE */ /* * This works. Despite all the confusion. @@ -143,6 +174,20 @@ here: :"=m" (lock->lock) : : "memory"); }
+static inline void _raw_spin_lock_flags (spinlock_t *lock, unsigned long flags) +{ +#ifdef CONFIG_DEBUG_SPINLOCK + __label__ here; +here: + if (unlikely(lock->magic != SPINLOCK_MAGIC)) { + printk("eip: %p\n", &&here); + BUG(); + } +#endif + __asm__ __volatile__( + spin_lock_string_flags + :"=m" (lock->lock) : "r" (flags) : "memory"); +}
/* * Read-write spinlocks, allowing multiple readers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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