From c7fc2de0c83dbd2eaf759c5cd0e2b9cf1eb4df3a Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Tue, 12 Oct 2010 14:07:09 -0700 Subject: memblock, bootmem: Round pfn properly for memory and reserved regions We need to round memory regions correctly -- specifically, we need to round reserved region in the more expansive direction (lower limit down, upper limit up) whereas usable memory regions need to be rounded in the more restrictive direction (lower limit up, upper limit down). This introduces two set of inlines: memblock_region_memory_base_pfn() memblock_region_memory_end_pfn() memblock_region_reserved_base_pfn() memblock_region_reserved_end_pfn() Although they are antisymmetric (and therefore are technically duplicates) the use of the different inlines explicitly documents the programmer's intention. The lack of proper rounding caused a bug on ARM, which was then found to also affect other architectures. Reported-by: Russell King Signed-off-by: Yinghai Lu LKML-Reference: <4CB4CDFD.4020105@kernel.org> Cc: Jeremy Fitzhardinge Signed-off-by: H. Peter Anvin --- arch/arm/mm/init.c | 8 ++++---- arch/powerpc/mm/mem.c | 14 +++++++------- arch/powerpc/mm/numa.c | 4 ++-- arch/sh/mm/init.c | 4 ++-- arch/sparc/mm/init_64.c | 4 ++-- 5 files changed, 17 insertions(+), 17 deletions(-) (limited to 'arch') diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index d6022d1f51d1..63f441797c96 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -182,8 +182,8 @@ static void __init arm_bootmem_init(struct meminfo *mi, * Reserve the memblock reserved regions in bootmem. */ for_each_memblock(reserved, reg) { - phys_addr_t start = memblock_region_base_pfn(reg); - phys_addr_t end = memblock_region_end_pfn(reg); + phys_addr_t start = memblock_region_reserved_base_pfn(reg); + phys_addr_t end = memblock_region_reserved_end_pfn(reg); if (start >= start_pfn && end <= end_pfn) reserve_bootmem_node(pgdat, __pfn_to_phys(start), (end - start) << PAGE_SHIFT, @@ -251,8 +251,8 @@ static void arm_memory_present(void) struct memblock_region *reg; for_each_memblock(memory, reg) - memory_present(0, memblock_region_base_pfn(reg), - memblock_region_end_pfn(reg)); + memory_present(0, memblock_region_memory_base_pfn(reg), + memblock_region_memory_end_pfn(reg)); } #endif diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index f661f6c527da..a66499650909 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -148,8 +148,8 @@ walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, int ret = -1; for_each_memblock(memory, reg) { - tstart = max(start_pfn, memblock_region_base_pfn(reg)); - tend = min(end_pfn, memblock_region_end_pfn(reg)); + tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); + tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); if (tstart >= tend) continue; ret = (*func)(tstart, tend - tstart, arg); @@ -195,8 +195,8 @@ void __init do_init_bootmem(void) /* Add active regions with valid PFNs */ for_each_memblock(memory, reg) { unsigned long start_pfn, end_pfn; - start_pfn = memblock_region_base_pfn(reg); - end_pfn = memblock_region_end_pfn(reg); + start_pfn = memblock_region_memory_base_pfn(reg); + end_pfn = memblock_region_memory_end_pfn(reg); add_active_range(0, start_pfn, end_pfn); } @@ -236,9 +236,9 @@ static int __init mark_nonram_nosave(void) for_each_memblock(memory, reg) { if (prev && - memblock_region_end_pfn(prev) < memblock_region_base_pfn(reg)) - register_nosave_region(memblock_region_end_pfn(prev), - memblock_region_base_pfn(reg)); + memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) + register_nosave_region(memblock_region_memory_end_pfn(prev), + memblock_region_memory_base_pfn(reg)); prev = reg; } return 0; diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 066fb443ba5a..74505b245374 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -811,8 +811,8 @@ static void __init setup_nonnuma(void) (top_of_ram - total_ram) >> 20); for_each_memblock(memory, reg) { - start_pfn = memblock_region_base_pfn(reg); - end_pfn = memblock_region_end_pfn(reg); + start_pfn = memblock_region_memory_base_pfn(reg); + end_pfn = memblock_region_memory_end_pfn(reg); fake_numa_create_new_node(end_pfn, &nid); add_active_range(nid, start_pfn, end_pfn); diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index b977475f7446..552bea5113f5 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -244,8 +244,8 @@ static void __init do_init_bootmem(void) /* Add active regions with valid PFNs. */ for_each_memblock(memory, reg) { unsigned long start_pfn, end_pfn; - start_pfn = memblock_region_base_pfn(reg); - end_pfn = memblock_region_end_pfn(reg); + start_pfn = memblock_region_memory_base_pfn(reg); + end_pfn = memblock_region_memory_end_pfn(reg); __add_active_range(0, start_pfn, end_pfn); } diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index dc584d26d597..4c2572773b55 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -1294,8 +1294,8 @@ static void __init bootmem_init_nonnuma(void) if (!reg->size) continue; - start_pfn = memblock_region_base_pfn(reg); - end_pfn = memblock_region_end_pfn(reg); + start_pfn = memblock_region_memory_base_pfn(reg); + end_pfn = memblock_region_memory_end_pfn(reg); add_active_range(0, start_pfn, end_pfn); } -- cgit