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 2026-10-29 03:01:39 -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

12
mm/ksm.c
View file

@ -1898,13 +1898,13 @@ int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
int ret = SWAP_AGAIN;
int search_new_forks = 0;
VM_BUG_ON(!PageKsm(page));
VM_BUG_ON_PAGE(!PageKsm(page), page);
/*
* Rely on the page lock to protect against concurrent modifications
* to that page's node of the stable tree.
*/
VM_BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(!PageLocked(page), page);
stable_node = page_stable_node(page);
if (!stable_node)
@ -1958,13 +1958,13 @@ void ksm_migrate_page(struct page *newpage, struct page *oldpage)
{
struct stable_node *stable_node;
VM_BUG_ON(!PageLocked(oldpage));
VM_BUG_ON(!PageLocked(newpage));
VM_BUG_ON(newpage->mapping != oldpage->mapping);
VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
VM_BUG_ON_PAGE(newpage->mapping != oldpage->mapping, newpage);
stable_node = page_stable_node(newpage);
if (stable_node) {
VM_BUG_ON(stable_node->kpfn != page_to_pfn(oldpage));
VM_BUG_ON_PAGE(stable_node->kpfn != page_to_pfn(oldpage), oldpage);
stable_node->kpfn = page_to_pfn(newpage);
/*
* newpage->mapping was set in advance; now we need smp_wmb()