linux-kernel - [PATCH 1/3] drivers: memory: clean up section counting

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Message-Id: <1449068821-9870-1-git-send-email-sjennings@variantweb.net>
Date:	Wed,  2 Dec 2015 09:06:59 -0600
From:	Seth Jennings <sjennings@...iantweb.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Seth Jennings <sjennings@...iantweb.net>,
	Andrew Banman <abanman@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russ Anderson <rja@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] drivers: memory: clean up section counting

Right now, section_count is calculated in add_memory_block().
However, init_memory_block() increments section_count as well,
which, at first, seems like it would lead to an off-by-one error.
There is no harm done because add_memory_block() immediately overwrites
the mem->section_count, but it is messy.

This commit moves the increment out of the common init_memory_block()
(called by both add_memory_block() and register_new_memory()) and
adds it to register_new_memory().

Signed-off-by: Seth Jennings <sjennings@...iantweb.net>
---
 drivers/base/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 2804aed..ca2ce02 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -614,7 +614,6 @@ static int init_memory_block(struct memory_block **memory,
 			base_memory_block_id(scn_nr) * sections_per_block;
 	mem->end_section_nr = mem->start_section_nr + sections_per_block - 1;
 	mem->state = state;
-	mem->section_count++;
 	start_pfn = section_nr_to_pfn(mem->start_section_nr);
 	mem->phys_device = arch_get_memory_phys_device(start_pfn);
 
@@ -668,6 +667,7 @@ int register_new_memory(int nid, struct mem_section *section)
 		ret = init_memory_block(&mem, section, MEM_OFFLINE);
 		if (ret)
 			goto out;
+		mem->section_count++;
 	}
 
 	if (mem->section_count == sections_per_block)
-- 
2.5.0
--
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