From mboxrd@z Thu Jan 1 00:00:00 1970 From: Toshi Kani Subject: [PATCH v2 2/3] resource: Add region_intersects_pmem() Date: Fri, 23 Oct 2015 12:53:58 -0600 Message-ID: <1445626439-8424-3-git-send-email-toshi.kani@hpe.com> References: <1445626439-8424-1-git-send-email-toshi.kani@hpe.com> Return-path: Received: from g2t4622.austin.hp.com ([15.73.212.79]:44607 "EHLO g2t4622.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752612AbbJWS5v (ORCPT ); Fri, 23 Oct 2015 14:57:51 -0400 In-Reply-To: <1445626439-8424-1-git-send-email-toshi.kani@hpe.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: akpm@linux-foundation.org, dan.j.williams@intel.com, rjw@rjwysocki.net Cc: linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Toshi Kani 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 --- 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) { }