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

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Message-Id: <1357322760-12197-1-git-send-email-cody@linux.vnet.ibm.com>
Date:	Fri,  4 Jan 2013 13:06:00 -0500
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH] 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().
---
 arch/powerpc/mm/mem.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0dba506..50370bb 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -195,13 +195,8 @@ 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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