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authorNick Piggin <npiggin@suse.de>2006-03-22 00:08:42 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-22 07:54:02 -0800
commitb7ab795b7bec9997d4fde39f249d52823d36d98d (patch)
tree8b8825a0718ec38b5b0840fe06efa9a92a0e30c7
parent6626c5d53bc45c59798628677ba5606f02e371f3 (diff)
downloadlinux-b7ab795b7bec9997d4fde39f249d52823d36d98d.tar.bz2
[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>
-rw-r--r--mm/memory.c12
-rw-r--r--mm/rmap.c9
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,