[patches] [PATCH] Fix mmap2 syscall for ColdFire

[Maxim Kuvyrkov <maxim@xxxxxxxxxxxxxxxx>]

This patch fixes mmap2 syscall on ColdFire systems.

M68K linux port expects the argument of mmap2 syscall to be counted in 
the memory pages.  ColdFire has a non-standard page size of 8K, which 
libc is not yet aware of.  The patch defines the MMAP2_PAGE_SHIFT macro 
to fix that.

This patch was rejected from GLIBC Ports in 
http://sourceware.org/ml/libc-ports/2009-10/msg00005.html .

OK to check in?

Thank you,

--
Maxim Kuvyrkov
CodeSourcery
maxim@xxxxxxxxxxxxxxxx
(650) 331-3385 x724

From 5efd401d137cc14f4cd99f2f0669d60aa1c267a5 Mon Sep 17 00:00:00 2001
From: Maxim Kuvyrkov <maxim@xxxxxxxxxxxxxxxx>
Date: Fri, 2 Oct 2009 14:22:47 +0400
Subject: [PATCH] Fix ColdFire's mmap2.

	* sysdeps/unix/sysv/linux/m68k/kernel-features.h (MMAP2_PAGE_SHIFT):
	Define to 13.

Signed-off-by: Maxim Kuvyrkov <maxim@xxxxxxxxxxxxxxxx>
---
 sysdeps/unix/sysv/linux/m68k/kernel-features.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/m68k/kernel-features.h b/sysdeps/unix/sysv/linux/m68k/kernel-features.h
index 2920943..fcff833 100644
--- a/sysdeps/unix/sysv/linux/m68k/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/m68k/kernel-features.h
@@ -39,3 +39,9 @@
 /* These syscalls are not implemented yet for m68k.  */
 #undef __ASSUME_PSELECT
 #undef __ASSUME_PPOLL
+
+#ifdef __mcoldfire__
+/* ColdFire kernels have PAGE_SHIFT set to 13 and expect
+   mmap2 offset to be provided in 8K pages.  */
+# define MMAP2_PAGE_SHIFT 13
+#endif
-- 
1.6.4