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mm, x86: Remove debug_pagealloc_enabled

Browse source 
When (no)bootmem finish operation, it pass pages to buddy
allocator. Since debug_pagealloc_enabled is not set, we will do
not protect pages, what is not what we want with
CONFIG_DEBUG_PAGEALLOC=y.

To fix remove debug_pagealloc_enabled. That variable was
introduced by commit 12d6f21e "x86: do not PSE on
CONFIG_DEBUG_PAGEALLOC=y" to get more CPA (change page
attribude) code testing. But currently we have CONFIG_CPA_DEBUG,
which test CPA.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1322582711-14571-1-git-send-email-sgruszka@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Stanislaw Gruszka 2011-11-29 17:05:11 +01:00 committed by Ingo Molnar
parent 855c743a27
commit 54c29c635a
4 changed files with 0 additions and 24 deletions
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6
arch/x86/mm/pageattr.c
View file

@ -1333,12 +1333,6 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
numpages * PAGE_SIZE);
}
/*
* If page allocator is not up yet then do not call c_p_a():
*/
if (!debug_pagealloc_enabled)
return;
/*
* The return value is ignored as the calls cannot fail.
* Large pages for identity mappings are not used at boot time

10
include/linux/mm.h
View file

@ -1537,23 +1537,13 @@ static inline void vm_stat_account(struct mm_struct *mm,
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_DEBUG_PAGEALLOC
extern int debug_pagealloc_enabled;
extern void kernel_map_pages(struct page *page, int numpages, int enable);
static inline void enable_debug_pagealloc(void)
{
debug_pagealloc_enabled = 1;
}
#ifdef CONFIG_HIBERNATION
extern bool kernel_page_present(struct page *page);
#endif /* CONFIG_HIBERNATION */
#else
static inline void
kernel_map_pages(struct page *page, int numpages, int enable) {}
static inline void enable_debug_pagealloc(void)
{
}
#ifdef CONFIG_HIBERNATION
static inline bool kernel_page_present(struct page *page) { return true; }
#endif /* CONFIG_HIBERNATION */

5
init/main.c
View file

@ -282,10 +282,6 @@ static int __init unknown_bootoption(char *param, char *val)
return 0;
}
#ifdef CONFIG_DEBUG_PAGEALLOC
int __read_mostly debug_pagealloc_enabled = 0;
#endif
static int __init init_setup(char *str)
{
unsigned int i;
@ -597,7 +593,6 @@ asmlinkage void __init start_kernel(void)
}
#endif
page_cgroup_init();
enable_debug_pagealloc();
debug_objects_mem_init();
kmemleak_init();
setup_per_cpu_pageset();

3
mm/debug-pagealloc.c
View file

@ -95,9 +95,6 @@ static void unpoison_pages(struct page *page, int n)
void kernel_map_pages(struct page *page, int numpages, int enable)
{
if (!debug_pagealloc_enabled)
return;
if (enable)
unpoison_pages(page, numpages);
else