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mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE

Selaa lähdekoodia 
Most of the VM_BUG_ON assertions are performed on a page.  Usually, when
one of these assertions fails we'll get a BUG_ON with a call stack and
the registers.

I've recently noticed based on the requests to add a small piece of code
that dumps the page to various VM_BUG_ON sites that the page dump is
quite useful to people debugging issues in mm.

This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what
VM_BUG_ON() does, also dumps the page before executing the actual
BUG_ON.

[akpm@linux-foundation.org: fix up includes]
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sasha Levin
2014-01-23 15:52:54 -08:00
committed by Linus Torvalds
vanhempi e3bba3c3c9
commit 309381feae
30 muutettua tiedostoa jossa 181 lisäystä ja 170 poistoa
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8
mm/memory.c
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@@ -289,7 +289,7 @@ int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
return 0;
batch = tlb->active;
}
VM_BUG_ON(batch->nr > batch->max);
VM_BUG_ON_PAGE(batch->nr > batch->max, page);
return batch->max - batch->nr;
}
@@ -2702,7 +2702,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto unwritable_page;
}
} else
VM_BUG_ON(!PageLocked(old_page));
VM_BUG_ON_PAGE(!PageLocked(old_page), old_page);
/*
* Since we dropped the lock we need to revalidate
@@ -3358,7 +3358,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (unlikely(!(ret & VM_FAULT_LOCKED)))
lock_page(vmf.page);
else
VM_BUG_ON(!PageLocked(vmf.page));
VM_BUG_ON_PAGE(!PageLocked(vmf.page), vmf.page);
/*
* Should we do an early C-O-W break?
@@ -3395,7 +3395,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
goto unwritable_page;
}
} else
VM_BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(!PageLocked(page), page);
page_mkwrite = 1;
}
}