linux-kernel - [PATCH v2] powerpc/mm: eliminate unneeded for_each

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Date:	Wed,  9 Jan 2013 14:40:18 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	galak@...nel.crashing.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH v2] powerpc/mm: eliminate unneeded for_each_memblock

The only persistent change made by this loop is calling
memblock_set_node() once for each memblock, which is not useful (and has
no effect) as memblock_set_node() is not called with any
memblock-specific parameters.

Subsistute a single memblock_set_node().

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---

Now with a signoff & wrapped comment line.

 arch/powerpc/mm/mem.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0dba506..40df7c8 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -195,13 +195,10 @@ void __init do_init_bootmem(void)
 	min_low_pfn = MEMORY_START >> PAGE_SHIFT;
 	boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
 
-	/* Add active regions with valid PFNs */
-	for_each_memblock(memory, reg) {
-		unsigned long start_pfn, end_pfn;
-		start_pfn = memblock_region_memory_base_pfn(reg);
-		end_pfn = memblock_region_memory_end_pfn(reg);
-		memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
-	}
+	/* Place all memblock_regions in the same node and merge contiguous
+	 * memblock_regions
+	 */
+	memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
 
 	/* Add all physical memory to the bootmem map, mark each area
 	 * present.
-- 
1.8.0.3

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