diff options
| author | Andrew Morton <akpm@osdl.org> | 2005-07-07 17:56:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-07 18:23:35 -0700 |
| commit | c23a4e9649f80a9379d7df4a33bc63b365d5e7fc (patch) | |
| tree | 89fb4aae49a2fc7181aade9e1dae34b1cc145a54 /arch/i386 | |
| parent | eda80228860641b7b0e963e6bd219b960c500af9 (diff) | |
| download | lwn-c23a4e9649f80a9379d7df4a33bc63b365d5e7fc.tar.gz lwn-c23a4e9649f80a9379d7df4a33bc63b365d5e7fc.zip | |
[PATCH] iounmap debugging
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>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/mm/ioremap.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/i386/mm/ioremap.c b/arch/i386/mm/ioremap.c index 6b25afc933b6..f379b8d67558 100644 --- a/arch/i386/mm/ioremap.c +++ b/arch/i386/mm/ioremap.c @@ -228,7 +228,8 @@ EXPORT_SYMBOL(ioremap_nocache); void iounmap(volatile void __iomem *addr) { struct vm_struct *p; - if ((void __force *) addr <= high_memory) + + if ((void __force *)addr <= high_memory) return; /* @@ -241,9 +242,10 @@ void iounmap(volatile void __iomem *addr) return; 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) { printk(KERN_WARNING "iounmap: bad address %p\n", addr); + dump_stack(); goto out_unlock; } |