From d0be89f6c2570a63ac44ccdd12473a54243cd296 Mon Sep 17 00:00:00 2001 From: Jian Peng Date: Tue, 17 May 2011 12:27:49 -0700 Subject: MIPS: topdown mmap support This patch introduced topdown mmap support in user process address space allocation policy. Recently, we ran some large applications that use mmap heavily and lead to OOM due to inflexible mmap allocation policy on MIPS32. Since most other major archs supported it for years, it is reasonable to follow the trend and reduce the pain of porting applications. Due to cache aliasing concern, arch_get_unmapped_area_topdown() and other helper functions are implemented in arch/mips/kernel/syscall.c. Signed-off-by: Jian Peng Cc: David Daney Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2389/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/pgtable.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/mips/include') diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index 7e40f3778179..b2202a68cf0f 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -414,6 +414,7 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, * constraints placed on us by the cache architecture. */ #define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN /* * No page table caches to initialise -- cgit v1.2.3