linux-kernel - [PATCH v2 4/9] x86: Support allocate memory from bottom upwards in setup_log

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Date:	Wed, 11 Sep 2013 18:07:32 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	tj@...nel.org, rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de,
	mingo@...e.hu, hpa@...or.com, akpm@...ux-foundation.org,
	trenn@...e.de, yinghai@...nel.org, jiang.liu@...wei.com,
	wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com, toshi.kani@...com
Cc:	x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: [PATCH v2 4/9] x86: Support allocate memory from bottom upwards in setup_log_buf().

During early boot, if the bottom up mode is set, just
try allocating bottom up from the end of kernel image,
and if that fails, do normal top down allocation.

So in function setup_log_buf(), we add the above logic.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 kernel/printk/printk.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index b4e8500..2958118 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -759,9 +759,20 @@ void __init setup_log_buf(int early)
 	if (early) {
 		unsigned long mem;
 
+		if (memblock_direction_bottom_up()) {
+			mem = memblock_alloc_bottom_up(
+						MEMBLOCK_ALLOC_ACCESSIBLE,
+						MEMBLOCK_ALLOC_ACCESSIBLE,
+						new_log_buf_len, PAGE_SIZE);
+			if (mem)
+				goto success;
+		}
+
 		mem = memblock_alloc(new_log_buf_len, PAGE_SIZE);
 		if (!mem)
 			return;
+
+success:
 		new_log_buf = __va(mem);
 	} else {
 		new_log_buf = alloc_bootmem_nopanic(new_log_buf_len);
-- 
1.7.1

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