From 077bb07062566fbd383d6e740ecf4e0a28c45b03 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Wed, 19 Jun 2013 10:06:16 +1000 Subject: [PATCH] mm: enhance free_reserved_area() to support poisoning memory with zero Address more review comments from last round of code review. 1) Enhance free_reserved_area() to support poisoning freed memory with pattern '0'. This could be used to get rid of poison_init_mem() on ARM64. 2) A previous patch has disabled memory poison for initmem on s390 by mistake, so restore to the original behavior. 3) Remove redundant PAGE_ALIGN() when calling free_reserved_area(). Signed-off-by: Jiang Liu Cc: Geert Uytterhoeven Cc: "H. Peter Anvin" Cc: "Michael S. Tsirkin" Cc: Cc: Arnd Bergmann Cc: Catalin Marinas Cc: Chris Metcalf Cc: David Howells Cc: Ingo Molnar Cc: Jeremy Fitzhardinge Cc: Jianguo Wu Cc: Joonsoo Kim Cc: Kamezawa Hiroyuki Cc: Konrad Rzeszutek Wilk Cc: Marek Szyprowski Cc: Mel Gorman Cc: Michel Lespinasse Cc: Minchan Kim Cc: Rik van Riel Cc: Rusty Russell Cc: Tang Chen Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wen Congyang Cc: Will Deacon Cc: Yasuaki Ishimatsu Cc: Yinghai Lu Cc: Russell King Signed-off-by: Andrew Morton --- arch/alpha/kernel/sys_nautilus.c | 2 +- arch/alpha/mm/init.c | 4 ++-- arch/arc/mm/init.c | 4 ++-- arch/arm/mm/init.c | 8 ++++---- arch/arm64/mm/init.c | 4 ++-- arch/avr32/mm/init.c | 4 ++-- arch/blackfin/mm/init.c | 4 ++-- arch/c6x/mm/init.c | 4 ++-- arch/cris/mm/init.c | 2 +- arch/frv/mm/init.c | 4 ++-- arch/h8300/mm/init.c | 4 ++-- arch/ia64/mm/init.c | 2 +- arch/m32r/mm/init.c | 4 ++-- arch/m68k/mm/init.c | 4 ++-- arch/microblaze/mm/init.c | 4 ++-- arch/openrisc/mm/init.c | 4 ++-- arch/parisc/mm/init.c | 4 ++-- arch/powerpc/kernel/kvm.c | 9 ++------- arch/powerpc/mm/mem.c | 2 +- arch/s390/mm/init.c | 2 +- arch/sh/mm/init.c | 4 ++-- arch/um/kernel/mem.c | 2 +- arch/unicore32/mm/init.c | 4 ++-- arch/xtensa/mm/init.c | 4 ++-- include/linux/mm.h | 7 ++++--- mm/page_alloc.c | 2 +- 26 files changed, 49 insertions(+), 53 deletions(-) diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c index 891bd274ccb5..837c0fa58317 100644 --- a/arch/alpha/kernel/sys_nautilus.c +++ b/arch/alpha/kernel/sys_nautilus.c @@ -239,7 +239,7 @@ nautilus_init_pci(void) memtop = pci_mem; if (memtop > alpha_mv.min_mem_address) { free_reserved_area(__va(alpha_mv.min_mem_address), - __va(memtop), 0, NULL); + __va(memtop), -1, NULL); printk("nautilus_init_pci: %ldk freed\n", (memtop - alpha_mv.min_mem_address) >> 10); } diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c index d54848d4e464..218c29c14bb3 100644 --- a/arch/alpha/mm/init.c +++ b/arch/alpha/mm/init.c @@ -319,13 +319,13 @@ mem_init(void) void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index dce02e4716a1..f9c707712096 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -146,13 +146,13 @@ void __init mem_init(void) */ void __init_refok free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD void __init free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 7fae391caf86..2070651c1bb4 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -601,7 +601,7 @@ void __init mem_init(void) #ifdef CONFIG_SA1111 /* now that our DMA memory is actually so designated, we can free it */ - free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL); + free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, -1, NULL); #endif free_highpages(); @@ -729,12 +729,12 @@ void free_initmem(void) extern char __tcm_start, __tcm_end; poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); - free_reserved_area(&__tcm_start, &__tcm_end, 0, "TCM link"); + free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); #endif poison_init_mem(__init_begin, __init_end - __init_begin); if (!machine_is_integrator() && !machine_is_cintegrator()) - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD @@ -745,7 +745,7 @@ void free_initrd_mem(unsigned long start, unsigned long end) { if (!keep_initrd) { poison_init_mem((void *)start, PAGE_ALIGN(end) - start); - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } } diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 6041e4008a83..997c6345cdd6 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -387,7 +387,7 @@ void __init mem_init(void) void free_initmem(void) { poison_init_mem(__init_begin, __init_end - __init_begin); - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD @@ -398,7 +398,7 @@ void free_initrd_mem(unsigned long start, unsigned long end) { if (!keep_initrd) { poison_init_mem((void *)start, PAGE_ALIGN(end) - start); - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } } diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c index 5a79fa08cb3c..b079e04f6954 100644 --- a/arch/avr32/mm/init.c +++ b/arch/avr32/mm/init.c @@ -148,12 +148,12 @@ void __init mem_init(void) void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c index 8e9eab272811..fa241f5a7dcf 100644 --- a/arch/blackfin/mm/init.c +++ b/arch/blackfin/mm/init.c @@ -133,7 +133,7 @@ void __init mem_init(void) void __init free_initrd_mem(unsigned long start, unsigned long end) { #ifndef CONFIG_MPU - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); #endif } #endif @@ -141,7 +141,7 @@ void __init free_initrd_mem(unsigned long start, unsigned long end) void __init_refok free_initmem(void) { #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU - free_initmem_default(0); + free_initmem_default(-1); if (memory_start == (unsigned long)(&__init_end)) memory_start = (unsigned long)(&__init_begin); #endif diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c index 97914e5fc987..7f25bef3eee3 100644 --- a/arch/c6x/mm/init.c +++ b/arch/c6x/mm/init.c @@ -77,11 +77,11 @@ void __init mem_init(void) #ifdef CONFIG_BLK_DEV_INITRD void __init free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif void __init free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } diff --git a/arch/cris/mm/init.c b/arch/cris/mm/init.c index 9ac80946dada..8fec26392ae7 100644 --- a/arch/cris/mm/init.c +++ b/arch/cris/mm/init.c @@ -65,5 +65,5 @@ mem_init(void) void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c index a67f3a5897b8..8ba9d22d0d91 100644 --- a/arch/frv/mm/init.c +++ b/arch/frv/mm/init.c @@ -162,7 +162,7 @@ void __init mem_init(void) void free_initmem(void) { #if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL) - free_initmem_default(0); + free_initmem_default(-1); #endif } /* end free_initmem() */ @@ -173,6 +173,6 @@ void free_initmem(void) #ifdef CONFIG_BLK_DEV_INITRD void __init free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } /* end free_initrd_mem() */ #endif diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c index 57e03c59861d..c831f1dba132 100644 --- a/arch/h8300/mm/init.c +++ b/arch/h8300/mm/init.c @@ -161,7 +161,7 @@ void __init mem_init(void) #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif @@ -169,7 +169,7 @@ void free_initmem(void) { #ifdef CONFIG_RAMKERNEL - free_initmem_default(0); + free_initmem_default(-1); #endif } diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index da568c2e839f..f8a4f38b0ad5 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -155,7 +155,7 @@ void free_initmem (void) { free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end), - 0, "unused kernel"); + -1, "unused kernel"); } void __init diff --git a/arch/m32r/mm/init.c b/arch/m32r/mm/init.c index d80412d0c14e..cca87d918436 100644 --- a/arch/m32r/mm/init.c +++ b/arch/m32r/mm/init.c @@ -181,7 +181,7 @@ void __init mem_init(void) *======================================================================*/ void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD @@ -191,6 +191,6 @@ void free_initmem(void) *======================================================================*/ void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c index 95de725534e9..ab0b54ca5d85 100644 --- a/arch/m68k/mm/init.c +++ b/arch/m68k/mm/init.c @@ -110,7 +110,7 @@ void __init paging_init(void) void free_initmem(void) { #ifndef CONFIG_MMU_SUN3 - free_initmem_default(0); + free_initmem_default(-1); #endif /* CONFIG_MMU_SUN3 */ } @@ -202,6 +202,6 @@ void __init mem_init(void) #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c index d7b8ada9345f..d149e0ebb767 100644 --- a/arch/microblaze/mm/init.c +++ b/arch/microblaze/mm/init.c @@ -235,13 +235,13 @@ void __init setup_memory(void) #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } void __init mem_init(void) diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c index ab113325dc4c..c371e4a0fcac 100644 --- a/arch/openrisc/mm/init.c +++ b/arch/openrisc/mm/init.c @@ -261,11 +261,11 @@ void __init mem_init(void) #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index 8fa418355e96..e6ad98d1b608 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -532,7 +532,7 @@ void free_initmem(void) * pages are no-longer executable */ flush_icache_range(init_begin, init_end); - num_physpages += free_initmem_default(0); + num_physpages += free_initmem_default(-1); /* set up a new led state on systems shipped LED State panel */ pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); @@ -1101,7 +1101,7 @@ void flush_tlb_all(void) #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - num_physpages += free_reserved_area((void *)start, (void *)end, 0, + num_physpages += free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 5e4830a33c08..db28032e320e 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -750,13 +750,8 @@ EXPORT_SYMBOL_GPL(kvm_hypercall); static __init void kvm_free_tmp(void) { - unsigned long start, end; - - start = (ulong)&kvm_tmp[kvm_tmp_index + (PAGE_SIZE - 1)] & PAGE_MASK; - end = (ulong)&kvm_tmp[ARRAY_SIZE(kvm_tmp)] & PAGE_MASK; - - /* Free the tmp space we don't need */ - free_reserved_area((void *)start, (void *)end, 0, NULL); + free_reserved_area(&kvm_tmp[kvm_tmp_index], + &kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL); } static int __init kvm_guest_init(void) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 347c5b1bbd62..7f47a05f55af 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -407,7 +407,7 @@ void free_initmem(void) #ifdef CONFIG_BLK_DEV_INITRD void __init free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 0878c89fe7d2..bf01d18422ec 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -166,7 +166,7 @@ void __init mem_init(void) void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(POISON_FREE_INITMEM); } #ifdef CONFIG_BLK_DEV_INITRD diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index b892a9b7d7e3..d3af56b7a098 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -499,13 +499,13 @@ void __init mem_init(void) void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 2aa7a2448d58..8ff0b7ae8ec0 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -244,7 +244,7 @@ void free_initmem(void) #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c index 220755cc9700..df9b8abcb6a5 100644 --- a/arch/unicore32/mm/init.c +++ b/arch/unicore32/mm/init.c @@ -476,7 +476,7 @@ void __init mem_init(void) void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD @@ -486,7 +486,7 @@ static int keep_initrd; void free_initrd_mem(unsigned long start, unsigned long end) { if (!keep_initrd) - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } static int __init keepinitrd_setup(char *__unused) diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c index 4d658efc3289..026d29bee30b 100644 --- a/arch/xtensa/mm/init.c +++ b/arch/xtensa/mm/init.c @@ -214,11 +214,11 @@ extern int initrd_is_mapped; void free_initrd_mem(unsigned long start, unsigned long end) { if (initrd_is_mapped) - free_reserved_area((void *)start, (void *)end, 0, "initrd"); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif void free_initmem(void) { - free_initmem_default(0); + free_initmem_default(-1); } diff --git a/include/linux/mm.h b/include/linux/mm.h index be1b96ce0650..083cc0ba2384 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1308,7 +1308,7 @@ extern void free_initmem(void); /* * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) * into the buddy system. The freed pages will be poisoned with pattern - * "poison" if it's non-zero. + * "poison" if it's within range [0, UCHAR_MAX]. * Return pages freed into the buddy system. */ extern unsigned long free_reserved_area(void *start, void *end, @@ -1348,8 +1348,9 @@ static inline void mark_page_reserved(struct page *page) /* * Default method to free all the __init memory into the buddy system. - * The freed pages will be poisoned with pattern "poison" if it is - * non-zero. Return pages freed into the buddy system. + * The freed pages will be poisoned with pattern "poison" if it's within + * range [0, UCHAR_MAX]. + * Return pages freed into the buddy system. */ static inline unsigned long free_initmem_default(int poison) { diff --git a/mm/page_alloc.c b/mm/page_alloc.c index be18ccd017bb..6780b2e18aa1 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5214,7 +5214,7 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s) start = (void *)PAGE_ALIGN((unsigned long)start); end = (void *)((unsigned long)end & PAGE_MASK); for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { - if (poison) + if ((unsigned int)poison <= 0xFF) memset(pos, poison, PAGE_SIZE); free_reserved_page(virt_to_page(pos)); } -- 2.39.5