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[PATCH] iounmap debugging

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We get sporadic reports of `__iounmap: bad address' coming out.  Add a
dump_stack() to find the culprit.

Try to identify which subsystem is having iounmap() problems.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton 2005-07-07 17:56:02 -07:00 committed by Linus Torvalds
parent eda8022886
commit c23a4e9649
1 changed files with 4 additions and 2 deletions
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6
arch/i386/mm/ioremap.c
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@ -228,7 +228,8 @@ EXPORT_SYMBOL(ioremap_nocache);
void iounmap(volatile void __iomem *addr) void iounmap(volatile void __iomem *addr)
{ {
struct vm_struct *p; struct vm_struct *p;
if ((void __force *) addr <= high_memory)
if ((void __force *)addr <= high_memory)
return; return;
/* /*
@ -241,9 +242,10 @@ void iounmap(volatile void __iomem *addr)
return; return;
write_lock(&vmlist_lock); write_lock(&vmlist_lock);
p = __remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr)); p = __remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
if (!p) { if (!p) {
printk(KERN_WARNING "iounmap: bad address %p\n", addr); printk(KERN_WARNING "iounmap: bad address %p\n", addr);
dump_stack();
goto out_unlock; goto out_unlock;
} }