linux-kernel - [PATCH v1] mm/memblock: Add memblock_first_region

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Message-Id: <1440703185-16072-1-git-send-email-kuleshovmail@gmail.com>
Date:	Fri, 28 Aug 2015 01:19:45 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Pekka Enberg <penberg@...nel.org>
Cc:	Mel Gorman <mgorman@...e.de>, Xishi Qiu <qiuxishi@...wei.com>,
	Baoquan He <bhe@...hat.com>, Robin Holt <holt@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH v1] mm/memblock: Add memblock_first_region_size() helper

Some architectures (like s390, microblaze and etc...) require size
of the first memory region. This patch provides new memblock_first_region_size()
helper for this case.

Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
 include/linux/memblock.h | 1 +
 mm/memblock.c            | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cc4b019..8a481e5 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -319,6 +319,7 @@ phys_addr_t memblock_phys_mem_size(void);
 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 phys_addr_t memblock_start_of_DRAM(void);
 phys_addr_t memblock_end_of_DRAM(void);
+phys_addr_t memblock_first_region_size(void);
 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 int memblock_is_memory(phys_addr_t addr);
 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
diff --git a/mm/memblock.c b/mm/memblock.c
index 87108e7..fb4b7ca 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1463,6 +1463,11 @@ phys_addr_t __init_memblock memblock_end_of_DRAM(void)
 	return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
 }
 
+phys_addr_t __init_memblock memblock_first_region_size(void)
+{
+	return memblock.memory.regions[0].size;
+}
+
 void __init memblock_enforce_memory_limit(phys_addr_t limit)
 {
 	phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
-- 
2.5.0

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