From: Jia He <justin.he@arm.com>
To: Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Mike Rapoport <rppt@linux.ibm.com>,
David Hildenbrand <david@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Dave Jiang <dave.jiang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Steve Capper <steve.capper@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Logan Gunthorpe <logang@deltatee.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Hsin-Yi Wang <hsinyi@chromium.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Dave Hansen <dave.hansen@linux.intel.com>,
Kees Cook <keescook@chromium.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
linux-mm@kvack.org, Wei Yang <richardw.yang@linux.intel.com>,
Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
Ira Weiny <ira.weiny@intel.com>, Kaly Xin <Kaly.Xin@arm.com>,
Jia He <justin.he@arm.com>
Subject: [RFC PATCH 2/6] resource: export find_next_iomem_res() helper
Date: Wed, 29 Jul 2020 11:34:20 +0800 [thread overview]
Message-ID: <20200729033424.2629-3-justin.he@arm.com> (raw)
In-Reply-To: <20200729033424.2629-1-justin.he@arm.com>
The helper is to find the lowest iomem resource that covers part of
[@start..@end]
It is useful when relaxing the alignment check for dax pmem kmem.
Signed-off-by: Jia He <justin.he@arm.com>
---
include/linux/ioport.h | 3 +++
kernel/resource.c | 3 ++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 6c2b06fe8beb..203fd16c9f45 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -247,6 +247,9 @@ extern struct resource * __request_region(struct resource *,
extern void __release_region(struct resource *, resource_size_t,
resource_size_t);
+extern int find_next_iomem_res(resource_size_t start, resource_size_t end,
+ unsigned long flags, unsigned long desc,
+ bool first_lvl, struct resource *res);
#ifdef CONFIG_MEMORY_HOTREMOVE
extern int release_mem_region_adjustable(struct resource *, resource_size_t,
resource_size_t);
diff --git a/kernel/resource.c b/kernel/resource.c
index 841737bbda9e..57e6a6802a3d 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -338,7 +338,7 @@ EXPORT_SYMBOL(release_resource);
* @first_lvl: walk only the first level children, if set
* @res: return ptr, if resource found
*/
-static int find_next_iomem_res(resource_size_t start, resource_size_t end,
+int find_next_iomem_res(resource_size_t start, resource_size_t end,
unsigned long flags, unsigned long desc,
bool first_lvl, struct resource *res)
{
@@ -391,6 +391,7 @@ static int find_next_iomem_res(resource_size_t start, resource_size_t end,
read_unlock(&resource_lock);
return p ? 0 : -ENODEV;
}
+EXPORT_SYMBOL(find_next_iomem_res);
static int __walk_iomem_res_desc(resource_size_t start, resource_size_t end,
unsigned long flags, unsigned long desc,
--
2.17.1
next prev parent reply other threads:[~2020-07-29 3:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-29 3:34 [RFC PATCH 0/6] decrease unnecessary gap due to pmem kmem alignment Jia He
2020-07-29 3:34 ` [RFC PATCH 1/6] mm/memory_hotplug: remove redundant memory block size alignment check Jia He
2020-07-29 3:34 ` Jia He [this message]
2020-07-29 3:34 ` [RFC PATCH 3/6] mm/memory_hotplug: allow pmem kmem not to align with memory_block_size Jia He
2020-07-29 3:34 ` [RFC PATCH 4/6] mm/page_alloc: adjust the start,end in dax pmem kmem case Jia He
2020-07-29 3:34 ` [RFC PATCH 5/6] device-dax: relax the memblock size alignment for kmem_start Jia He
2020-07-29 3:34 ` [RFC PATCH 6/6] arm64: fall back to vmemmap_populate_basepages if not aligned with PMD_SIZE Jia He
2020-07-29 6:36 ` [RFC PATCH 0/6] decrease unnecessary gap due to pmem kmem alignment David Hildenbrand
2020-07-29 8:27 ` Justin He
2020-07-29 8:44 ` David Hildenbrand
2020-07-29 9:31 ` Mike Rapoport
2020-07-29 9:35 ` David Hildenbrand
2020-07-29 13:00 ` Mike Rapoport
2020-07-29 13:03 ` David Hildenbrand
2020-07-29 14:12 ` Mike Rapoport
2020-07-30 2:17 ` Justin He
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