From a91690ddd05ab0b7fbdd37733875525ac75c20f2 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 17 Mar 2006 14:41:03 -0800 Subject: [SPARC64]: Top-down address space allocation for 32-bit tasks. Currently allocations are very constrained for 32-bit processes. It grows down-up from 0x70000000 to 0xf0000000 which gives about 2GB of stack + dynamic mmap() space. So support the top-down method, and we need to override the generic helper function in order to deal with D-cache coloring. With these changes I was able to squeeze out a mmap() just over 3.6GB in size in a 32-bit process. Signed-off-by: David S. Miller --- include/asm-sparc64/pgtable.h | 5 ++++- include/asm-sparc64/processor.h | 2 ++ 2 files changed, 6 insertions(+), 1 deletion(-) (limited to 'include/asm-sparc64') diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h index d427ce649214..ed4124edf837 100644 --- a/include/asm-sparc64/pgtable.h +++ b/include/asm-sparc64/pgtable.h @@ -752,8 +752,11 @@ extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, #include -/* We provide our own get_unmapped_area to cope with VA holes for userland */ +/* We provide our own get_unmapped_area to cope with VA holes and + * SHM area cache aliasing for userland. + */ #define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN /* We provide a special get_unmapped_area for framebuffer mmaps to try and use * the largest alignment possible such that larget PTEs can be used. diff --git a/include/asm-sparc64/processor.h b/include/asm-sparc64/processor.h index 685479fb4364..c6896b88283e 100644 --- a/include/asm-sparc64/processor.h +++ b/include/asm-sparc64/processor.h @@ -217,6 +217,8 @@ static inline void prefetchw(const void *x) #define spin_lock_prefetch(x) prefetchw(x) +#define HAVE_ARCH_PICK_MMAP_LAYOUT + #endif /* !(__ASSEMBLY__) */ #endif /* !(__ASM_SPARC64_PROCESSOR_H) */ -- cgit v1.2.2