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sh: Rework irqflags tracing to fix up CONFIG_PROVE_LOCKING.

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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>
This commit is contained in:
Stuart Menefy 2009-07-29 23:01:24 +09:00 • committed by Paul Mundt
parent 82b242214b
commit fd78a76aef
5 changed files with 96 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

7
arch/sh/kernel/io_trapped.c
View file

@ -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);