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[MIPS] lockdep: fix TRACE_IRQFLAGS_SUPPORT

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In handle_sys and its variants, we must reload some registers which
might be clobbered by trace_hardirqs_on().
Also we must make sure trace_hardirqs_on() called in kernel level (not
exception level).

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2006-09-26 23:43:40 +09:00 committed by Ralf Baechle
parent d834c16516
commit eae6c0da9d
5 changed files with 29 additions and 15 deletions
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13
arch/mips/kernel/scall32-o32.S
View file

@ -28,18 +28,7 @@
NESTED(handle_sys, PT_SIZE, sp)
.set noat
SAVE_SOME
#ifdef CONFIG_TRACE_IRQFLAGS
TRACE_IRQS_ON
#ifdef CONFIG_64BIT
LONG_L $8, PT_R8(sp)
LONG_L $9, PT_R9(sp)
#endif
LONG_L $7, PT_R7(sp)
LONG_L $6, PT_R6(sp)
LONG_L $5, PT_R5(sp)
LONG_L $4, PT_R4(sp)
LONG_L $2, PT_R2(sp)
#endif
TRACE_IRQS_ON_RELOAD
STI
.set at

2
arch/mips/kernel/scall64-64.S
View file

@ -34,7 +34,7 @@ NESTED(handle_sys64, PT_SIZE, sp)
*/
.set noat
SAVE_SOME
TRACE_IRQS_ON
TRACE_IRQS_ON_RELOAD
STI
.set at
#endif

2
arch/mips/kernel/scall64-n32.S
View file

@ -33,7 +33,7 @@ NESTED(handle_sysn32, PT_SIZE, sp)
#ifndef CONFIG_MIPS32_O32
.set noat
SAVE_SOME
TRACE_IRQS_ON
TRACE_IRQS_ON_RELOAD
STI
.set at
#endif

2
arch/mips/kernel/scall64-o32.S
View file

@ -28,7 +28,7 @@
NESTED(handle_sys, PT_SIZE, sp)
.set noat
SAVE_SOME
TRACE_IRQS_ON
TRACE_IRQS_ON_RELOAD
STI
.set at
ld t1, PT_EPC(sp) # skip syscall on return

25
include/asm-mips/irqflags.h
View file

@ -213,12 +213,37 @@ static inline int raw_irqs_disabled_flags(unsigned long flags)
* Do the CPU's IRQ-state tracing from assembly code.
*/
#ifdef CONFIG_TRACE_IRQFLAGS
/* Reload some registers clobbered by trace_hardirqs_on */
#ifdef CONFIG_64BIT
# define TRACE_IRQS_RELOAD_REGS \
LONG_L $11, PT_R11(sp); \
LONG_L $10, PT_R10(sp); \
LONG_L $9, PT_R9(sp); \
LONG_L $8, PT_R8(sp); \
LONG_L $7, PT_R7(sp); \
LONG_L $6, PT_R6(sp); \
LONG_L $5, PT_R5(sp); \
LONG_L $4, PT_R4(sp); \
LONG_L $2, PT_R2(sp)
#else
# define TRACE_IRQS_RELOAD_REGS \
LONG_L $7, PT_R7(sp); \
LONG_L $6, PT_R6(sp); \
LONG_L $5, PT_R5(sp); \
LONG_L $4, PT_R4(sp); \
LONG_L $2, PT_R2(sp)
#endif
# define TRACE_IRQS_ON \
CLI; /* make sure trace_hardirqs_on() is called in kernel level */ \
jal trace_hardirqs_on
# define TRACE_IRQS_ON_RELOAD \
TRACE_IRQS_ON; \
TRACE_IRQS_RELOAD_REGS
# define TRACE_IRQS_OFF \
jal trace_hardirqs_off
#else
# define TRACE_IRQS_ON
# define TRACE_IRQS_ON_RELOAD
# define TRACE_IRQS_OFF
#endif