linux-kernel - [PATCH 08/11] x86, acpi, memblock: Use __memblock_alloc_base() in acpi_initrd

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Date:	Tue, 27 Aug 2013 17:37:45 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	hpa@...or.com, akpm@...ux-foundation.org, tj@...nel.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
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 08/11] x86, acpi, memblock: Use __memblock_alloc_base() in acpi_initrd_override()

The current acpi_initrd_override() calls memblock_find_in_range() to allocate
memory, and pass 0 to %start, which will not limited by the current_limit_low.

acpi_initrd_override()
 |->memblock_find_in_range(0, ...)
     |->memblock_find_in_range_node(0, ...)

When we want to allocate memory from the end of kernel image to higher memory,
we need to limit the lowest address to the end of kernel image.

We have modified memblock_alloc_base_nid() to call memblock_find_in_range_node()
with %start = MEMBLOCK_ALLOC_ACCESSIBLE, which means it will be limited by
current_limit_low. And __memblock_alloc_base() calls memblock_alloc_base_nid().

__memblock_alloc_base()
 |->memblock_alloc_base_nid()
     |->memblock_find_in_range_node(MEMBLOCK_ALLOC_ACCESSIBLE, ...)

So use __memblock_alloc_base() to allocate memory in acpi_initrd_override().

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 drivers/acpi/osl.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index fece767..1d68fc0 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -629,8 +629,8 @@ void __init acpi_initrd_override(void *data, size_t size)
 		return;
 
 	/* under 4G at first, then above 4G */
-	acpi_tables_addr = memblock_find_in_range(0, (1ULL<<32) - 1,
-					all_tables_size, PAGE_SIZE);
+	acpi_tables_addr = __memblock_alloc_base(all_tables_size,
+						 PAGE_SIZE, (1ULL<<32) - 1);
 	if (!acpi_tables_addr) {
 		WARN_ON(1);
 		return;
-- 
1.7.1

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