Messages in this thread Patch in this message | | | From | Toshi Kani <> | Subject | [PATCH v2 2/3] resource: Add region_intersects_pmem() | Date | Fri, 23 Oct 2015 12:53:58 -0600 |
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Add region_intersects_pmem(), which checks if a specified address range is persistent memory registered as "Persistent Memory" in the iomem_resource list.
Note, it does not support legacy persistent memory registered as "Persistent Memory (legacy)". It can be supported by extending this function or a separate function, if necessary.
This interface is exported so that it can be called from modules, such as the EINJ driver.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com> --- include/linux/mm.h | 1 + kernel/resource.c | 12 ++++++++++++ 2 files changed, 13 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 699224e..ae1790f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -361,6 +361,7 @@ enum { int region_intersects(resource_size_t offset, size_t size, const char *type, unsigned long flags); int region_intersects_ram(resource_size_t offset, size_t size); +int region_intersects_pmem(resource_size_t offset, size_t size); /* Support for virtually mapped pages */ struct page *vmalloc_to_page(const void *addr); diff --git a/kernel/resource.c b/kernel/resource.c index 15c133e..5230e63 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -548,6 +548,18 @@ int region_intersects_ram(resource_size_t start, size_t size) } EXPORT_SYMBOL_GPL(region_intersects_ram); +/* + * region_intersects_pmem() checks if a specified address range is + * persistent memory, registered as "Persistent Memory", in the + * iomem_resource list. + */ +int region_intersects_pmem(resource_size_t start, size_t size) +{ + return region_intersects(start, size, "Persistent Memory", + IORESOURCE_MEM); +} +EXPORT_SYMBOL_GPL(region_intersects_pmem); + void __weak arch_remove_reservations(struct resource *avail) { }
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