309381feae
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>
26 lines
645 B
C
26 lines
645 B
C
#ifndef LINUX_MM_DEBUG_H
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#define LINUX_MM_DEBUG_H 1
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struct page;
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extern void dump_page(struct page *page, char *reason);
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extern void dump_page_badflags(struct page *page, char *reason,
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unsigned long badflags);
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#ifdef CONFIG_DEBUG_VM
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#define VM_BUG_ON(cond) BUG_ON(cond)
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#define VM_BUG_ON_PAGE(cond, page) \
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do { if (unlikely(cond)) { dump_page(page, NULL); BUG(); } } while (0)
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#else
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#define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
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#define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
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#endif
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#ifdef CONFIG_DEBUG_VIRTUAL
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#define VIRTUAL_BUG_ON(cond) BUG_ON(cond)
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#else
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#define VIRTUAL_BUG_ON(cond) do { } while (0)
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#endif
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#endif
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