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Commit fd78a76a authored by Stuart Menefy's avatar Stuart Menefy Committed by Paul Mundt
Browse files

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: default avatarNobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: default avatarStuart Menefy <stuart.menefy@st.com>
Signed-off-by: default avatarMatt Fleming <matt@console-pimps.org>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 82b24221

arch/sh/Kconfig.debug

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/sh/include/asm/entry-macros.S

+72 −0
Original line number Diff line number Diff line
@@ -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

arch/sh/kernel/entry-common.S

+16 −47
Original line number Diff line number Diff line
@@ -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

arch/sh/kernel/io_trapped.c

+4 −3
Original line number Diff line number Diff line
@@ -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);

drivers/serial/sh-sci.c

+3 −2
Original line number Diff line number Diff line
@@ -662,10 +662,11 @@ static irqreturn_t sci_rx_interrupt(int irq, void *port) 
static irqreturn_t sci_tx_interrupt(int irq, void *ptr)

{

	struct uart_port *port = ptr;

	unsigned long flags;



	spin_lock_irq(&port->lock);

	spin_lock_irqsave(&port->lock, flags);

	sci_transmit_chars(port);

	spin_unlock_irq(&port->lock);

	spin_unlock_irqrestore(&port->lock, flags);



	return IRQ_HANDLED;

}