From 00673f93826bf1fbde728d202c319a684bb87150 Mon Sep 17 00:00:00 2001 From: Mike Frysinger <vapier@gentoo.org> Date: Mon, 23 Nov 2009 21:35:34 -0500 Subject: nommu: use MAP_UNINITIALIZE for mallocs Now that the kernel supports MAP_UNINITIALIZE, have the malloc places use it to get real uninitialized memory on no-mmu systems. This avoids a lot of normally useless overhead involved in zeroing out all of the memory (sometimes multiple times). Signed-off-by: Mike Frysinger <vapier@gentoo.org> --- libc/sysdeps/linux/sparc/bits/mman.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'libc/sysdeps/linux/sparc') diff --git a/libc/sysdeps/linux/sparc/bits/mman.h b/libc/sysdeps/linux/sparc/bits/mman.h index be2b7eb28..74921e4c5 100644 --- a/libc/sysdeps/linux/sparc/bits/mman.h +++ b/libc/sysdeps/linux/sparc/bits/mman.h @@ -65,6 +65,8 @@ # define _MAP_NEW 0x80000000 /* Binary compatibility with SunOS. */ # define MAP_POPULATE 0x8000 /* Populate (prefault) pagetables. */ # define MAP_NONBLOCK 0x10000 /* Do not block on IO. */ +# define MAP_UNINITIALIZE 0x4000000 /* For anonymous mmap, memory could + be uninitialized. */ #endif /* Flags to `msync'. */ -- cgit v1.2.3