linux-kernel - [PATCH v3 10/17] resource: Change walk_system

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Date:	Tue,  5 Jan 2016 11:54:34 -0700
From:	Toshi Kani <toshi.kani@....com>
To:	akpm@...ux-foundation.org, bp@...en8.de
Cc:	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	Toshi Kani <toshi.kani@....com>
Subject: [PATCH v3 10/17] resource: Change walk_system_ram to use System RAM type

Now that all System RAM resource entries have been initialized
to IORESOURCE_SYSTEM_RAM type, change walk_system_ram_res() and
walk_system_ram_range() to call find_next_iomem_res() by setting
IORESOURCE_SYSTEM_RAM to @res.flags and NULL to @name.  With
this change, they walk through the iomem table to find System
RAM ranges without using strcmp().

No functional change is made to the interfaces.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Toshi Kani <toshi.kani@....com>
---
 kernel/resource.c |   22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 65eca4d..1d3ea50 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -415,9 +415,9 @@ int walk_iomem_res(char *name, unsigned long flags, u64 start, u64 end,
 }
 
 /*
- * This function calls callback against all memory range of "System RAM"
- * which are marked as IORESOURCE_MEM and IORESOUCE_BUSY.
- * Now, this function is only for "System RAM". This function deals with
+ * This function calls callback against all memory range of System RAM
+ * which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY.
+ * Now, this function is only for System RAM. This function deals with
  * full ranges and not pfn. If resources are not pfn aligned, dealing
  * with pfn can truncate ranges.
  */
@@ -430,10 +430,10 @@ int walk_system_ram_res(u64 start, u64 end, void *arg,
 
 	res.start = start;
 	res.end = end;
-	res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+	res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 	orig_end = res.end;
 	while ((res.start < res.end) &&
-		(!find_next_iomem_res(&res, "System RAM", true))) {
+		(!find_next_iomem_res(&res, NULL, true))) {
 		ret = (*func)(res.start, res.end, arg);
 		if (ret)
 			break;
@@ -446,9 +446,9 @@ int walk_system_ram_res(u64 start, u64 end, void *arg,
 #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
 
 /*
- * This function calls callback against all memory range of "System RAM"
- * which are marked as IORESOURCE_MEM and IORESOUCE_BUSY.
- * Now, this function is only for "System RAM".
+ * This function calls callback against all memory range of System RAM
+ * which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY.
+ * Now, this function is only for System RAM.
  */
 int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 		void *arg, int (*func)(unsigned long, unsigned long, void *))
@@ -460,10 +460,10 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 
 	res.start = (u64) start_pfn << PAGE_SHIFT;
 	res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1;
-	res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+	res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 	orig_end = res.end;
 	while ((res.start < res.end) &&
-		(find_next_iomem_res(&res, "System RAM", true) >= 0)) {
+		(find_next_iomem_res(&res, NULL, true) >= 0)) {
 		pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT;
 		end_pfn = (res.end + 1) >> PAGE_SHIFT;
 		if (end_pfn > pfn)
@@ -484,7 +484,7 @@ static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
 }
 /*
  * This generic page_is_ram() returns true if specified address is
- * registered as "System RAM" in iomem_resource list.
+ * registered as System RAM in iomem_resource list.
  */
 int __weak page_is_ram(unsigned long pfn)
 {
--
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