Thread (131 messages) 131 messages, 5 authors, 2019-09-10

DANGER WILL ROBINSON, DANGER

From: Matthew Wilcox <willy@infradead.org>
Date: 2019-08-09 16:24:53
Also in: kvm, linux-mm

On Fri, Aug 09, 2019 at 07:00:26PM +0300, Adalbert Lazăr wrote:
quoted hunk ↗ jump to hunk
+++ b/include/linux/page-flags.h
@@ -417,8 +417,10 @@ PAGEFLAG(Idle, idle, PF_ANY)
  */
 #define PAGE_MAPPING_ANON	0x1
 #define PAGE_MAPPING_MOVABLE	0x2
+#define PAGE_MAPPING_REMOTE	0x4
Uh.  How do you know page->mapping would otherwise have bit 2 clear?
Who's guaranteeing that?

This is an awfully big patch to the memory management code, buried in
the middle of a gigantic series which almost guarantees nobody would
look at it.  I call shenanigans.
quoted hunk ↗ jump to hunk
@@ -1021,7 +1022,7 @@ void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
  * __page_set_anon_rmap - set up new anonymous rmap
  * @page:	Page or Hugepage to add to rmap
  * @vma:	VM area to add page to.
- * @address:	User virtual address of the mapping	
+ * @address:	User virtual address of the mapping
And mixing in fluff changes like this is a real no-no.  Try again.

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