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memblock, bootmem: Round pfn properly for memory and reserved regions

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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 <rmk@arm.linux.org.uk>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4CB4CDFD.4020105@kernel.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2010-10-12 14:07:09 -07:00 committed by H. Peter Anvin
parent 8e4029ee35
commit c7fc2de0c8
6 changed files with 29 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm/mm/init.c
View File

@ -182,8 +182,8 @@ static void __init arm_bootmem_init(struct meminfo *mi,
* Reserve the memblock reserved regions in bootmem. * Reserve the memblock reserved regions in bootmem.
*/ */
for_each_memblock(reserved, reg) { for_each_memblock(reserved, reg) {
phys_addr_t start = memblock_region_base_pfn(reg); phys_addr_t start = memblock_region_reserved_base_pfn(reg);
phys_addr_t end = memblock_region_end_pfn(reg); phys_addr_t end = memblock_region_reserved_end_pfn(reg);
if (start >= start_pfn && end <= end_pfn) if (start >= start_pfn && end <= end_pfn)
reserve_bootmem_node(pgdat, __pfn_to_phys(start), reserve_bootmem_node(pgdat, __pfn_to_phys(start),
(end - start) << PAGE_SHIFT, (end - start) << PAGE_SHIFT,
@ -251,8 +251,8 @@ static void arm_memory_present(void)
struct memblock_region *reg; struct memblock_region *reg;
for_each_memblock(memory, reg) for_each_memblock(memory, reg)
memory_present(0, memblock_region_base_pfn(reg), memory_present(0, memblock_region_memory_base_pfn(reg),
memblock_region_end_pfn(reg)); memblock_region_memory_end_pfn(reg));
} }
#endif #endif

14
arch/powerpc/mm/mem.c
View File

@ -148,8 +148,8 @@ walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
int ret = -1; int ret = -1;
for_each_memblock(memory, reg) { for_each_memblock(memory, reg) {
tstart = max(start_pfn, memblock_region_base_pfn(reg)); tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
tend = min(end_pfn, memblock_region_end_pfn(reg)); tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
if (tstart >= tend) if (tstart >= tend)
continue; continue;
ret = (*func)(tstart, tend - tstart, arg); ret = (*func)(tstart, tend - tstart, arg);
@ -195,8 +195,8 @@ void __init do_init_bootmem(void)
/* Add active regions with valid PFNs */ /* Add active regions with valid PFNs */
for_each_memblock(memory, reg) { for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn; unsigned long start_pfn, end_pfn;
start_pfn = memblock_region_base_pfn(reg); start_pfn = memblock_region_memory_base_pfn(reg);
end_pfn = memblock_region_end_pfn(reg); end_pfn = memblock_region_memory_end_pfn(reg);
add_active_range(0, start_pfn, end_pfn); add_active_range(0, start_pfn, end_pfn);
} }
@ -236,9 +236,9 @@ static int __init mark_nonram_nosave(void)
for_each_memblock(memory, reg) { for_each_memblock(memory, reg) {
if (prev && if (prev &&
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_end_pfn(prev), register_nosave_region(memblock_region_memory_end_pfn(prev),
memblock_region_base_pfn(reg)); memblock_region_memory_base_pfn(reg));
prev = reg; prev = reg;
} }
return 0; return 0;

4
arch/powerpc/mm/numa.c
View File

@ -811,8 +811,8 @@ static void __init setup_nonnuma(void)
(top_of_ram - total_ram) >> 20); (top_of_ram - total_ram) >> 20);
for_each_memblock(memory, reg) { for_each_memblock(memory, reg) {
start_pfn = memblock_region_base_pfn(reg); start_pfn = memblock_region_memory_base_pfn(reg);
end_pfn = memblock_region_end_pfn(reg); end_pfn = memblock_region_memory_end_pfn(reg);
fake_numa_create_new_node(end_pfn, &nid); fake_numa_create_new_node(end_pfn, &nid);
add_active_range(nid, start_pfn, end_pfn); add_active_range(nid, start_pfn, end_pfn);

4
arch/sh/mm/init.c
View File

@ -244,8 +244,8 @@ static void __init do_init_bootmem(void)
/* Add active regions with valid PFNs. */ /* Add active regions with valid PFNs. */
for_each_memblock(memory, reg) { for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn; unsigned long start_pfn, end_pfn;
start_pfn = memblock_region_base_pfn(reg); start_pfn = memblock_region_memory_base_pfn(reg);
end_pfn = memblock_region_end_pfn(reg); end_pfn = memblock_region_memory_end_pfn(reg);
__add_active_range(0, start_pfn, end_pfn); __add_active_range(0, start_pfn, end_pfn);
} }

4
arch/sparc/mm/init_64.c
View File

@ -1294,8 +1294,8 @@ static void __init bootmem_init_nonnuma(void)
if (!reg->size) if (!reg->size)
continue; continue;
start_pfn = memblock_region_base_pfn(reg); start_pfn = memblock_region_memory_base_pfn(reg);
end_pfn = memblock_region_end_pfn(reg); end_pfn = memblock_region_memory_end_pfn(reg);
add_active_range(0, start_pfn, end_pfn); add_active_range(0, start_pfn, end_pfn);
} }

25
include/linux/memblock.h
View File

@ -111,40 +111,39 @@ extern void memblock_set_current_limit(phys_addr_t limit);
*/ */
/** /**
* memblock_region_base_pfn - Return the lowest pfn intersecting with the region * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
* @reg: memblock_region structure * @reg: memblock_region structure
*/ */
static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg) static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
{ {
return reg->base >> PAGE_SHIFT; return PFN_UP(reg->base);
} }
/** /**
* memblock_region_last_pfn - Return the highest pfn intersecting with the region * memblock_region_memory_end_pfn - Return the end_pfn this region
* @reg: memblock_region structure * @reg: memblock_region structure
*/ */
static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg) static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
{ {
return (reg->base + reg->size - 1) >> PAGE_SHIFT; return PFN_DOWN(reg->base + reg->size);
} }
/** /**
* memblock_region_end_pfn - Return the pfn of the first page following the region * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
* but not intersecting it
* @reg: memblock_region structure * @reg: memblock_region structure
*/ */
static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg) static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
{ {
return memblock_region_last_pfn(reg) + 1; return PFN_DOWN(reg->base);
} }
/** /**
* memblock_region_pages - Return the number of pages covering a region * memblock_region_reserved_end_pfn - Return the end_pfn this region
* @reg: memblock_region structure * @reg: memblock_region structure
*/ */
static inline unsigned long memblock_region_pages(const struct memblock_region *reg) static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
{ {
return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg); return PFN_UP(reg->base + reg->size);
} }
#define for_each_memblock(memblock_type, region) \ #define for_each_memblock(memblock_type, region) \