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| author | Nick Piggin <npiggin@suse.de> | 2006-03-22 09:08:42 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-22 16:54:02 +0100 |
| commit | b7ab795b7bec9997d4fde39f249d52823d36d98d (patch) | |
| tree | 8b8825a0718ec38b5b0840fe06efa9a92a0e30c7 /mm | |
| parent | [PATCH] mm: prep_zero_page() in irq is a bug (diff) | |
| download | linux-b7ab795b7bec9997d4fde39f249d52823d36d98d.tar.xz linux-b7ab795b7bec9997d4fde39f249d52823d36d98d.zip | |
[PATCH] mm: more CONFIG_DEBUG_VM
Put a few more checks under CONFIG_DEBUG_VM
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 12 | ||||
| -rw-r--r-- | mm/rmap.c | 9 |
2 files changed, 7 insertions, 14 deletions
diff --git a/mm/memory.c b/mm/memory.c index 6af555c1c42a..71bc664efed5 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -388,7 +388,7 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_ { unsigned long pfn = pte_pfn(pte); - if (vma->vm_flags & VM_PFNMAP) { + if (unlikely(vma->vm_flags & VM_PFNMAP)) { unsigned long off = (addr - vma->vm_start) >> PAGE_SHIFT; if (pfn == vma->vm_pgoff + off) return NULL; @@ -396,18 +396,12 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_ return NULL; } - /* - * Add some anal sanity checks for now. Eventually, - * we should just do "return pfn_to_page(pfn)", but - * in the meantime we check that we get a valid pfn, - * and that the resulting page looks ok. - * - * Remove this test eventually! - */ +#ifdef CONFIG_DEBUG_VM if (unlikely(!pfn_valid(pfn))) { print_bad_pte(vma, pte, addr); return NULL; } +#endif /* * NOTE! We still have PageReserved() pages in the page diff --git a/mm/rmap.c b/mm/rmap.c index 134aef9d66c5..1963e269314d 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -56,13 +56,11 @@ #include <asm/tlbflush.h> -//#define RMAP_DEBUG /* can be enabled only for debugging */ - struct kmem_cache *anon_vma_cachep; static inline void validate_anon_vma(struct vm_area_struct *find_vma) { -#ifdef RMAP_DEBUG +#ifdef CONFIG_DEBUG_VM struct anon_vma *anon_vma = find_vma->anon_vma; struct vm_area_struct *vma; unsigned int mapcount = 0; @@ -551,13 +549,14 @@ void page_add_file_rmap(struct page *page) void page_remove_rmap(struct page *page) { if (atomic_add_negative(-1, &page->_mapcount)) { - if (page_mapcount(page) < 0) { +#ifdef CONFIG_DEBUG_VM + if (unlikely(page_mapcount(page) < 0)) { printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page_mapcount(page)); printk (KERN_EMERG " page->flags = %lx\n", page->flags); printk (KERN_EMERG " page->count = %x\n", page_count(page)); printk (KERN_EMERG " page->mapping = %p\n", page->mapping); } - +#endif BUG_ON(page_mapcount(page) < 0); /* * It would be tidy to reset the PageAnon mapping here, |