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| author | Minfei Huang <mnfhuang@gmail.com> | 2014-10-23 23:36:17 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-10-28 12:21:48 +0100 |
| commit | 96e70f83285676d8794f62f3c294d0247bef6b21 (patch) | |
| tree | 2d182d3a0ec64b38f305914aa5e3592e15e0269a /arch/x86 | |
| parent | cac7f2429872d3733dc3f9915857b1691da2eb2f (diff) | |
| download | linux-stable-96e70f83285676d8794f62f3c294d0247bef6b21.tar.gz linux-stable-96e70f83285676d8794f62f3c294d0247bef6b21.tar.bz2 linux-stable-96e70f83285676d8794f62f3c294d0247bef6b21.zip | |
x86/mm: Avoid overlap the fixmap area on i386
It is a problem when configuring high memory off where the
vmalloc reserve area could end up overlapping the early_ioremap
fixmap area on i386.
The ordering of the VMALLOC_RESERVE space is:
FIXADDR_TOP
fixed_addresses
FIXADDR_START
early_ioremap fixed addresses
FIXADDR_BOOT_START
Persistent kmap area
PKMAP_BASE
VMALLOC_END
Vmalloc area
VMALLOC_START
high_memory
The available address we can use is lower than
FIXADDR_BOOT_START. So we will set the kmap boundary below the
FIXADDR_BOOT_START, if we configure high memory.
If we configure high memory, the vmalloc reserve area should
end up to PKMAP_BASE, otherwise should end up to
FIXADDR_BOOT_START.
Signed-off-by: Minfei Huang <mnfhuang@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/6B680A9E-6CE9-4C96-934B-CB01DCB58278@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/pgtable_32_types.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h index ed5903be26fe..2ac5fc86abb3 100644 --- a/arch/x86/include/asm/pgtable_32_types.h +++ b/arch/x86/include/asm/pgtable_32_types.h @@ -43,7 +43,7 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */ #ifdef CONFIG_HIGHMEM # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) #else -# define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE) +# define VMALLOC_END (FIXADDR_BOOT_START - 2 * PAGE_SIZE) #endif #define MODULES_VADDR VMALLOC_START |