A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 02:32:09 -04:00
Code Issues Projects Releases Packages Wiki Activity

mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

10
mm/internal.h
View file

@ -27,8 +27,8 @@ static inline void set_page_count(struct page *page, int v)
*/
static inline void set_page_refcounted(struct page *page)
{
VM_BUG_ON(PageTail(page));
VM_BUG_ON(atomic_read(&page->_count));
VM_BUG_ON_PAGE(PageTail(page), page);
VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
set_page_count(page, 1);
}
@ -46,7 +46,7 @@ static inline void __get_page_tail_foll(struct page *page,
* speculative page access (like in
* page_cache_get_speculative()) on tail pages.
*/
VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
VM_BUG_ON_PAGE(atomic_read(&page->first_page->_count) <= 0, page);
if (get_page_head)
atomic_inc(&page->first_page->_count);
get_huge_page_tail(page);
@ -71,7 +71,7 @@ static inline void get_page_foll(struct page *page)
* Getting a normal page or the head of a compound page
* requires to already have an elevated page->_count.
*/
VM_BUG_ON(atomic_read(&page->_count) <= 0);
VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
atomic_inc(&page->_count);
}
}
@ -173,7 +173,7 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
struct page *page)
{
VM_BUG_ON(PageLRU(page));
VM_BUG_ON_PAGE(PageLRU(page), page);
if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
return 0;