linux-kernel - [PATCH] ARM: fix bug which lowmem size is limited to 760MB

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Message-id: <1441257066-10963-1-git-send-email-ytk.lee@samsung.com>
Date:	Thu, 03 Sep 2015 14:11:06 +0900
From:	Yongtaek Lee <ytk.lee@...sung.com>
To:	Russell King <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Yongtaek Lee <ytk.lee@...sung.com>
Subject: [PATCH] ARM: fix bug which lowmem size is limited to 760MB

default value of VMALLOC_START was set 0xf0000000 for ARM by commit
0536bdf3. It leads lowmem end address 0xef800000 not 0xf0000000.

VMALLOC_END - (240 << 20) - VMALLOC_OFFSET)
0xff000000 - 0x0f000000 - 0x00800000 = 0xef800000

In case of 768MB ram without CONFIG_HIGHMEM=y, last 8MB could not be
allocated. Kernel log also print out warning message as below.
"Truncating RAM at 80000000-afffffff to -af7fffff (vmalloc region overlap)."

Although it could be solved by state "vmalloc=size" in cmdline but i think
it would be better to change default value to 232 from 240.

Signed-off-by: Yongtaek Lee <ytk.lee@...sung.com>
---
 arch/arm/mm/mmu.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 8348ed6..9a1bab4 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1040,12 +1040,12 @@ void __init debug_ll_io_init(void)
 #endif
 
 static void * __initdata vmalloc_min =
-	(void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
+	(void *)(VMALLOC_END - (232 << 20) - VMALLOC_OFFSET);
 
 /*
  * vmalloc=size forces the vmalloc area to be exactly 'size'
  * bytes. This can be used to increase (or decrease) the vmalloc
- * area - the default is 240m.
+ * area - the default is 232m.
  */
 static int __init early_vmalloc(char *arg)
 {
-- 
1.7.9

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