linux-kernel - [RESEND PATCH v2 5/9] x86: Support allocate memory from bottom upwards in relocate

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Date:	Thu, 12 Sep 2013 17:52:13 +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: [RESEND PATCH v2 5/9] x86: Support allocate memory from bottom upwards in relocate_initrd().

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 relocate_initrd(), we add the above logic.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 arch/x86/kernel/setup.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index f0de629..7372be7 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -326,6 +326,15 @@ static void __init relocate_initrd(void)
 	char *p, *q;
 
 	/* We need to move the initrd down into directly mapped mem */
+	if (memblock_direction_bottom_up()) {
+		ramdisk_here = memblock_alloc_bottom_up(
+						MEMBLOCK_ALLOC_ACCESSIBLE,
+						PFN_PHYS(max_pfn_mapped),
+						area_size, PAGE_SIZE);
+		if (ramdisk_here)
+			goto success;
+	}
+
 	ramdisk_here = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
 						 area_size, PAGE_SIZE);
 
@@ -333,6 +342,7 @@ static void __init relocate_initrd(void)
 		panic("Cannot find place for new RAMDISK of size %lld\n",
 			 ramdisk_size);
 
+success:
 	/* Note: this includes all the mem currently occupied by
 	   the initrd, we rely on that fact to keep the data intact. */
 	memblock_reserve(ramdisk_here, area_size);
-- 
1.7.1

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