diff options
author | Stuart Menefy <stuart.menefy@st.com> | 2009-07-29 18:01:24 +0400 |
---|---|---|
committer | Paul Mundt <lethal@linux-sh.org> | 2009-07-29 18:01:24 +0400 |
commit | fd78a76aefb5bf28a11d6960d29e03a11db62320 (patch) | |
tree | 8dac39f13c9b3bdadda02594f49501b5522ecad7 /arch | |
parent | 82b242214b6f5b96eb9b76452ac6e2b67dd81abd (diff) | |
download | linux-fd78a76aefb5bf28a11d6960d29e03a11db62320.tar.xz |
sh: Rework irqflags tracing to fix up CONFIG_PROVE_LOCKING.
This cleans up the irqflags tracing code quite a bit and ties it
in to various missing callsites that caused an imbalance when
CONFIG_PROVE_LOCKING was enabled.
Previously this was catching on:
987 #ifdef CONFIG_PROVE_LOCKING
988 DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
989 DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
990 #endif
991 retval = -EAGAIN;
with hardirqs being doubly enabled, and subsequently bailing out
with the following call trace:
Call trace:
[<88035224>] __lock_acquire+0x616/0x6a6
[<88015a8c>] do_fork+0xf8/0x2b0
[<880331ec>] trace_hardirqs_on_caller+0xd4/0x114
[<88241074>] _spin_unlock_irq+0x20/0x64
[<88035224>] __lock_acquire+0x616/0x6a6
[<8800386c>] kernel_thread+0x48/0x70
[<88024ecc>] ____call_usermodehelper+0x0/0x110
[<88024ecc>] ____call_usermodehelper+0x0/0x110
[<88003894>] kernel_thread_helper+0x0/0x14
[<88024bac>] __call_usermodehelper+0x38/0x70
[<88025dc0>] worker_thread+0x150/0x274
[<88035b9c>] lock_release+0x0/0x198
[<88024b74>] __call_usermodehelper+0x0/0x70
[<88028cf0>] autoremove_wake_function+0x0/0x30
[<88028bf2>] kthread+0x3e/0x70
[<88025c70>] worker_thread+0x0/0x274
[<8800389c>] kernel_thread_helper+0x8/0x14
[<88028bb4>] kthread+0x0/0x70
[<88003894>] kernel_thread_helper+0x0/0x14
Reported-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/sh/Kconfig.debug | 2 | ||||
-rw-r--r-- | arch/sh/include/asm/entry-macros.S | 72 | ||||
-rw-r--r-- | arch/sh/kernel/entry-common.S | 63 | ||||
-rw-r--r-- | arch/sh/kernel/io_trapped.c | 7 |
4 files changed, 93 insertions, 51 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug index b440fd936714..a6dce41296e7 100644 --- a/arch/sh/Kconfig.debug +++ b/arch/sh/Kconfig.debug @@ -38,7 +38,7 @@ config EARLY_SCIF_CONSOLE_PORT default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \ CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \ CPU_SUBTYPE_SH7343 - default "0xffea0000" if CPU_SUBTYPE_SH7785 + default "0xffeb0000" if CPU_SUBTYPE_SH7785 default "0xffeb0000" if CPU_SUBTYPE_SH7786 default "0xfffe8000" if CPU_SUBTYPE_SH7203 default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263 diff --git a/arch/sh/include/asm/entry-macros.S b/arch/sh/include/asm/entry-macros.S index 3a4752a65722..1bdd93891cd7 100644 --- a/arch/sh/include/asm/entry-macros.S +++ b/arch/sh/include/asm/entry-macros.S @@ -31,6 +31,78 @@ #endif .endm +#ifdef CONFIG_TRACE_IRQFLAGS + + .macro TRACE_IRQS_ON + mov.l r0, @-r15 + mov.l r1, @-r15 + mov.l r2, @-r15 + mov.l r3, @-r15 + mov.l r4, @-r15 + mov.l r5, @-r15 + mov.l r6, @-r15 + mov.l r7, @-r15 + + mov.l 7834f, r0 + jsr @r0 + nop + + mov.l @r15+, r7 + mov.l @r15+, r6 + mov.l @r15+, r5 + mov.l @r15+, r4 + mov.l @r15+, r3 + mov.l @r15+, r2 + mov.l @r15+, r1 + mov.l @r15+, r0 + mov.l 7834f, r0 + + bra 7835f + nop + .balign 4 +7834: .long trace_hardirqs_on +7835: + .endm + .macro TRACE_IRQS_OFF + + mov.l r0, @-r15 + mov.l r1, @-r15 + mov.l r2, @-r15 + mov.l r3, @-r15 + mov.l r4, @-r15 + mov.l r5, @-r15 + mov.l r6, @-r15 + mov.l r7, @-r15 + + mov.l 7834f, r0 + jsr @r0 + nop + + mov.l @r15+, r7 + mov.l @r15+, r6 + mov.l @r15+, r5 + mov.l @r15+, r4 + mov.l @r15+, r3 + mov.l @r15+, r2 + mov.l @r15+, r1 + mov.l @r15+, r0 + mov.l 7834f, r0 + + bra 7835f + nop + .balign 4 +7834: .long trace_hardirqs_off +7835: + .endm + +#else + .macro TRACE_IRQS_ON + .endm + + .macro TRACE_IRQS_OFF + .endm +#endif + #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4) # define PREF(x) pref @x #else diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index d62175650c54..fc26ccd82789 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -45,7 +45,7 @@ */ #if defined(CONFIG_PREEMPT) -# define preempt_stop() cli +# define preempt_stop() cli ; TRACE_IRQS_OFF #else # define preempt_stop() # define resume_kernel __restore_all @@ -55,11 +55,7 @@ .align 2 ENTRY(exception_error) ! -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 2f, r0 - jsr @r0 - nop -#endif + TRACE_IRQS_ON sti mov.l 1f, r0 jmp @r0 @@ -67,22 +63,23 @@ ENTRY(exception_error) .align 2 1: .long do_exception_error -#ifdef CONFIG_TRACE_IRQFLAGS -2: .long trace_hardirqs_on -#endif .align 2 ret_from_exception: preempt_stop() -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 4f, r0 - jsr @r0 - nop -#endif ENTRY(ret_from_irq) ! mov #OFF_SR, r0 mov.l @(r0,r15), r0 ! get status register + + shlr2 r0 + and #0x3c, r0 + cmp/eq #0x3c, r0 + bt 9f + TRACE_IRQS_ON +9: + mov #OFF_SR, r0 + mov.l @(r0,r15), r0 ! get status register shll r0 shll r0 ! kernel space? get_current_thread_info r8, r0 @@ -125,11 +122,7 @@ noresched: ENTRY(resume_userspace) ! r8: current_thread_info cli -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 5f, r0 - jsr @r0 - nop -#endif + TRACE_IRQS_OfF mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags tst #(_TIF_WORK_MASK & 0xff), r0 bt/s __restore_all @@ -156,11 +149,7 @@ work_resched: jsr @r1 ! schedule nop cli -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 5f, r0 - jsr @r0 - nop -#endif + TRACE_IRQS_OFF ! mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags tst #(_TIF_WORK_MASK & 0xff), r0 @@ -172,10 +161,6 @@ work_resched: 1: .long schedule 2: .long do_notify_resume 3: .long resume_userspace -#ifdef CONFIG_TRACE_IRQFLAGS -4: .long trace_hardirqs_on -5: .long trace_hardirqs_off -#endif .align 2 syscall_exit_work: @@ -184,11 +169,7 @@ syscall_exit_work: tst #(_TIF_WORK_SYSCALL_MASK & 0xff), r0 bt/s work_pending tst #_TIF_NEED_RESCHED, r0 -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 5f, r0 - jsr @r0 - nop -#endif + TRACE_IRQS_ON sti mov r15, r4 mov.l 8f, r0 ! do_syscall_trace_leave @@ -321,11 +302,7 @@ ENTRY(system_call) bt/s debug_trap ! it's a debug trap.. nop -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 5f, r10 - jsr @r10 - nop -#endif + TRACE_IRQS_ON sti ! @@ -355,11 +332,7 @@ syscall_call: ! syscall_exit: cli -#ifdef CONFIG_TRACE_IRQFLAGS - mov.l 6f, r0 - jsr @r0 - nop -#endif + TRACE_IRQS_OFF ! get_current_thread_info r8, r0 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags @@ -377,9 +350,5 @@ syscall_exit: #endif 2: .long NR_syscalls 3: .long sys_call_table -#ifdef CONFIG_TRACE_IRQFLAGS -5: .long trace_hardirqs_on -6: .long trace_hardirqs_off -#endif 7: .long do_syscall_trace_enter 8: .long do_syscall_trace_leave diff --git a/arch/sh/kernel/io_trapped.c b/arch/sh/kernel/io_trapped.c index 77dfecb64373..e27a19e1f46e 100644 --- a/arch/sh/kernel/io_trapped.c +++ b/arch/sh/kernel/io_trapped.c @@ -112,14 +112,15 @@ void __iomem *match_trapped_io_handler(struct list_head *list, struct trapped_io *tiop; struct resource *res; int k, len; + unsigned long flags; - spin_lock_irq(&trapped_lock); + spin_lock_irqsave(&trapped_lock, flags); list_for_each_entry(tiop, list, list) { voffs = 0; for (k = 0; k < tiop->num_resources; k++) { res = tiop->resource + k; if (res->start == offset) { - spin_unlock_irq(&trapped_lock); + spin_unlock_irqrestore(&trapped_lock, flags); return tiop->virt_base + voffs; } @@ -127,7 +128,7 @@ void __iomem *match_trapped_io_handler(struct list_head *list, voffs += roundup(len, PAGE_SIZE); } } - spin_unlock_irq(&trapped_lock); + spin_unlock_irqrestore(&trapped_lock, flags); return NULL; } EXPORT_SYMBOL_GPL(match_trapped_io_handler); |