diff options
Diffstat (limited to 'include/linux/memory.h')
| -rw-r--r-- | include/linux/memory.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h index 463dc02f6cff..1783299073e4 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -20,6 +20,7 @@ #include <linux/compiler.h> #include <linux/mutex.h> #include <linux/memory_hotplug.h> +#include <linux/range.h> #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) @@ -100,6 +101,32 @@ int arch_get_memory_phys_device(unsigned long start_pfn); unsigned long memory_block_size_bytes(void); int set_memory_block_size_order(unsigned int order); +/** + * memory_block_aligned_range - align a physical address range to memory blocks + * @range: the input range to align + * + * Aligns the start address up and the end address down to memory block + * boundaries. This is required for memory hotplug operations which must + * operate on memory-block aligned ranges. + * + * Returns the aligned range. Callers should check that the returned + * range is valid (aligned.start < aligned.end) before using it. + */ +static inline struct range memory_block_aligned_range(const struct range *range) +{ + struct range aligned; + + aligned.start = ALIGN(range->start, memory_block_size_bytes()); + aligned.end = ALIGN_DOWN(range->end + 1, memory_block_size_bytes()); + /* No whole block fits (e.g. range below the first boundary): empty. */ + if (aligned.end <= aligned.start) + aligned.start = aligned.end; + else + aligned.end -= 1; + + return aligned; +} + struct memory_notify { unsigned long start_pfn; unsigned long nr_pages; |