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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>,
	Andrew Morton <akpm@linux-foundation.org>,
	Steve Capper <steve.capper@arm.com>,
	Mark Rutland <mark.rutland@arm.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, Pankaj Gupta <pankaj.gupta.linux@gmail.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
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WARNING: multiple messages have this Message-ID (diff)
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


WARNING: multiple messages have this Message-ID (diff)
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: Mark Rutland <mark.rutland@arm.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-mm@kvack.org, Ira Weiny <ira.weiny@intel.com>,
	Dave Jiang <dave.jiang@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>,
	Will Deacon <will@kernel.org>, Kaly Xin <Kaly.Xin@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Hsin-Yi Wang <hsinyi@chromium.org>, Jia He <justin.he@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
	Steve Capper <steve.capper@arm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
	Wei Yang <richardw.yang@linux.intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Logan Gunthorpe <logang@deltatee.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


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2020-07-29  3:35 UTC|newest]

Thread overview: 56+ 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 ` Jia He
2020-07-29  3:34 ` 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
2020-07-29  3:34   ` Jia He
2020-07-29  3:34 ` Jia He [this message]
2020-07-29  3:34   ` [RFC PATCH 2/6] resource: export find_next_iomem_res() helper Jia He
2020-07-29  3:34   ` Jia He
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   ` Jia He
2020-07-29  3:34   ` 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 4/6] mm/page_alloc: adjust the start, end " Jia He
2020-07-29  3:34   ` [RFC PATCH 4/6] mm/page_alloc: adjust the start,end " 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   ` Jia He
2020-07-29  3:34   ` 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  3:34   ` Jia He
2020-07-29  3:34   ` Jia He
2020-07-29  6:36 ` [RFC PATCH 0/6] decrease unnecessary gap due to pmem kmem alignment David Hildenbrand
2020-07-29  6:36   ` David Hildenbrand
2020-07-29  6:36   ` David Hildenbrand
2020-07-29  8:27   ` Justin He
2020-07-29  8:27     ` Justin He
2020-07-29  8:27     ` Justin He
2020-07-29  8:27     ` Justin He
2020-07-29  8:44     ` David Hildenbrand
2020-07-29  8:44       ` David Hildenbrand
2020-07-29  8:44       ` David Hildenbrand
2020-07-29  8:44       ` David Hildenbrand
2020-07-29  9:31     ` Mike Rapoport
2020-07-29  9:31       ` Mike Rapoport
2020-07-29  9:31       ` Mike Rapoport
2020-07-29  9:31       ` Mike Rapoport
2020-07-29  9:35       ` David Hildenbrand
2020-07-29  9:35         ` David Hildenbrand
2020-07-29  9:35         ` David Hildenbrand
2020-07-29  9:35         ` David Hildenbrand
2020-07-29 13:00         ` Mike Rapoport
2020-07-29 13:00           ` Mike Rapoport
2020-07-29 13:00           ` Mike Rapoport
2020-07-29 13:00           ` Mike Rapoport
2020-07-29 13:03           ` David Hildenbrand
2020-07-29 13:03             ` David Hildenbrand
2020-07-29 13:03             ` David Hildenbrand
2020-07-29 13:03             ` David Hildenbrand
2020-07-29 14:12             ` Mike Rapoport
2020-07-29 14:12               ` Mike Rapoport
2020-07-29 14:12               ` Mike Rapoport
2020-07-29 14:12               ` Mike Rapoport
2020-07-30  2:17         ` Justin He
2020-07-30  2:17           ` Justin He
2020-07-30  2:17           ` Justin He
2020-07-30  2:17           ` Justin He

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