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[PATCH] lockdep: irqtrace subsystem, i386 support

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Add irqflags-tracing support to i386.

Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ingo Molnar 2006-07-03 00:24:43 -07:00 • committed by Linus Torvalds
commit 55f327fa9e
6 changed files with 104 additions and 23 deletions
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56
include/asm-i386/irqflags.h Normal file
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@ -0,0 +1,56 @@
/*
* include/asm-i386/irqflags.h
*
* IRQ flags handling
*
* This file gets included from lowlevel asm headers too, to provide
* wrapped versions of the local_irq_*() APIs, based on the
* raw_local_irq_*() macros from the lowlevel headers.
*/
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H
#define raw_local_save_flags(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */); } while (0)
#define raw_local_irq_restore(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory", "cc"); } while (0)
#define raw_local_irq_disable() __asm__ __volatile__("cli": : :"memory")
#define raw_local_irq_enable() __asm__ __volatile__("sti": : :"memory")
/* used in the idle loop; sti takes one instruction cycle to complete */
#define raw_safe_halt() __asm__ __volatile__("sti; hlt": : :"memory")
/* used when interrupts are already enabled or to shutdown the processor */
#define halt() __asm__ __volatile__("hlt": : :"memory")
#define raw_irqs_disabled_flags(flags) (!((flags) & (1<<9)))
/* For spinlocks etc */
#define raw_local_irq_save(x) __asm__ __volatile__("pushfl ; popl %0 ; cli":"=g" (x): /* no input */ :"memory")
/*
* Do the CPU's IRQ-state tracing from assembly code. We call a
* C function, so save all the C-clobbered registers:
*/
#ifdef CONFIG_TRACE_IRQFLAGS
# define TRACE_IRQS_ON \
pushl %eax; \
pushl %ecx; \
pushl %edx; \
call trace_hardirqs_on; \
popl %edx; \
popl %ecx; \
popl %eax;
# define TRACE_IRQS_OFF \
pushl %eax; \
pushl %ecx; \
pushl %edx; \
call trace_hardirqs_off; \
popl %edx; \
popl %ecx; \
popl %eax;
#else
# define TRACE_IRQS_ON
# define TRACE_IRQS_OFF
#endif
#endif

5
include/asm-i386/spinlock.h
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@ -31,6 +31,11 @@
"jmp 1b\n" \
"3:\n\t"
/*
* NOTE: there's an irqs-on section here, which normally would have to be
* irq-traced, but on CONFIG_TRACE_IRQFLAGS we never use
* __raw_spin_lock_string_flags().
*/
#define __raw_spin_lock_string_flags \
"\n1:\t" \
"lock ; decb %0\n\t" \

20
include/asm-i386/system.h
View file

@ -456,25 +456,7 @@ static inline unsigned long long __cmpxchg64(volatile void *ptr, unsigned long l
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
/* interrupt control.. */
#define local_save_flags(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */); } while (0)
#define local_irq_restore(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory", "cc"); } while (0)
#define local_irq_disable() __asm__ __volatile__("cli": : :"memory")
#define local_irq_enable() __asm__ __volatile__("sti": : :"memory")
/* used in the idle loop; sti takes one instruction cycle to complete */
#define safe_halt() __asm__ __volatile__("sti; hlt": : :"memory")
/* used when interrupts are already enabled or to shutdown the processor */
#define halt() __asm__ __volatile__("hlt": : :"memory")
#define irqs_disabled() \
({ \
unsigned long flags; \
local_save_flags(flags); \
!(flags & (1<<9)); \
})
/* For spinlocks etc */
#define local_irq_save(x) __asm__ __volatile__("pushfl ; popl %0 ; cli":"=g" (x): /* no input */ :"memory")
#include <linux/irqflags.h>
/*
* disable hlt during certain critical i/o operations