lkml.org 
[lkml]   [2019]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] mm/page-flags: Check enforce parameter in PF_ONLY_HEAD()
Date
Just check for enforce parameter in PF_ONLY_HEAD() wrapper before calling
VM_BUG_ON_PGFLAGS() for tail pages.

Fixes: 62906027091f ("mm: add PageWaiters indicating tasks are waiting for a page bit")
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
include/linux/page-flags.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 9f8712a4b1a5..82539e287bc6 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -229,7 +229,7 @@ static inline void page_init_poison(struct page *page, size_t size)
#define PF_ANY(page, enforce) PF_POISONED_CHECK(page)
#define PF_HEAD(page, enforce) PF_POISONED_CHECK(compound_head(page))
#define PF_ONLY_HEAD(page, enforce) ({ \
- VM_BUG_ON_PGFLAGS(PageTail(page), page); \
+ VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \
PF_POISONED_CHECK(page); })
#define PF_NO_TAIL(page, enforce) ({ \
VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \
--
2.20.1
\
 
 \ /
  Last update: 2019-03-27 13:28    [W:0.036 / U:27.952 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site