From 21a99a182ccdd86359d11a110afef7bd67fa5dd0 Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Fri, 2 Dec 2011 14:12:07 +1100 Subject: [PATCH] mm,x86: remove debug_pagealloc_enabled When (no)bootmem finishes its operation, it passes pages to the buddy allocator. Since debug_pagealloc_enabled is not set, we will not protect these pages, which is not what we want with CONFIG_DEBUG_PAGEALLOC=y. To fix this, 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 tests CPA. Signed-off-by: Stanislaw Gruszka Acked-by: Mel Gorman Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- arch/x86/mm/pageattr.c | 6 ------ include/linux/mm.h | 10 ---------- init/main.c | 5 ----- mm/debug-pagealloc.c | 3 --- 4 files changed, 24 deletions(-) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index eda2acbb6e81..e1ebde315210 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -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 diff --git a/include/linux/mm.h b/include/linux/mm.h index 01f614b2fbc7..243a736ab30f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1538,23 +1538,13 @@ 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 */ diff --git a/init/main.c b/init/main.c index 217ed23e9487..99c4ba30ba7e 100644 --- a/init/main.c +++ b/init/main.c @@ -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(); diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c index 7cea557407f4..789ff70c8a4a 100644 --- a/mm/debug-pagealloc.c +++ b/mm/debug-pagealloc.c @@ -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 -- 2.39.5