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mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE

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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.

[[email protected]: fix up includes]
Signed-off-by: Sasha Levin <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Sasha Levin 2014-01-23 15:52:54 -08:00 • committed by Linus Torvalds
commit 309381feae
30 changed files with 181 additions and 170 deletions
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6
mm/cleancache.c
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@ -237,7 +237,7 @@ int __cleancache_get_page(struct page *page)
goto out;
}
VM_BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(!PageLocked(page), page);
fake_pool_id = page->mapping->host->i_sb->cleancache_poolid;
if (fake_pool_id < 0)
goto out;
@ -279,7 +279,7 @@ void __cleancache_put_page(struct page *page)
return;
}
VM_BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(!PageLocked(page), page);
fake_pool_id = page->mapping->host->i_sb->cleancache_poolid;
if (fake_pool_id < 0)
return;
@ -318,7 +318,7 @@ void __cleancache_invalidate_page(struct address_space *mapping,
if (pool_id < 0)
return;
VM_BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(!PageLocked(page), page);
if (cleancache_get_key(mapping->host, &key) >= 0) {
cleancache_ops->invalidate_page(pool_id,
key, page->index);