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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2015-09-13 03:25:26 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-09-22 08:13:57 +0100 |
| commit | 6ff0966052c46efb53980b8a1add2e7b49c9f560 (patch) | |
| tree | 7fb25013442035b048936549be4dab2efc473f6e | |
| parent | 803e3dbcb4cf80c898faccf01875f6ff6e5e76fd (diff) | |
| download | linux-6ff0966052c46efb53980b8a1add2e7b49c9f560.tar.bz2 | |
ARM: 8432/1: move VMALLOC_END from 0xff000000 to 0xff800000
There is a 12MB unused region in our memory map between the vmalloc and
fixmap areas. This became unused with commit e9da6e9905e6, confirmed
with commit 64d3b6a3f480.
We also have a 8MB guard area before the vmalloc area. With the default
240MB vmalloc area size and the current VMALLOC_END definition, that
means the end of low memory ends up at 0xef800000 which is unfortunate
for 768MB machines where 8MB of RAM is lost to himem.
Let's move VMALLOC_END to 0xff800000 so the guard area won't chop the
top of the 768MB low memory area while keeping the default vmalloc area
size unchanged and still preserving a gap between the vmalloc and fixmap
areas.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | Documentation/arm/memory.txt | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/arm/memory.txt b/Documentation/arm/memory.txt index 4178ebda6e66..546a39048eb0 100644 --- a/Documentation/arm/memory.txt +++ b/Documentation/arm/memory.txt @@ -54,7 +54,7 @@ VMALLOC_START VMALLOC_END-1 vmalloc() / ioremap() space. located here through iotable_init(). VMALLOC_START is based upon the value of the high_memory variable, and VMALLOC_END - is equal to 0xff000000. + is equal to 0xff800000. PAGE_OFFSET high_memory-1 Kernel direct-mapped RAM region. This maps the platforms RAM, and typically diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index f40354198bad..348caabb7625 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -43,7 +43,7 @@ */ #define VMALLOC_OFFSET (8*1024*1024) #define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) -#define VMALLOC_END 0xff000000UL +#define VMALLOC_END 0xff800000UL #define LIBRARY_TEXT_START 0x0c000000 |