From: SUGIOKA Toshinobu <sugioka@itonet.co.jp>
To: linux-sh@vger.kernel.org
Subject: [PATCH] fix mmap2 syscall
Date: Mon, 20 Apr 2009 21:48:43 +0000 [thread overview]
Message-ID: <4.2.0.58.J.20090421052216.0362b680@router.itonet.co.jp> (raw)
Hi,
Last argument of mmap2 system call is always (offset >> 12) in glibc regardless of the PAGE_SIZE,
but do_mmap_pgoff function requires 'pgoff' parameter which is shifted by real PAGE_SHIFT.
So, we should adjust this argument if page size is not equal to 4k byte.
Signed-off-by: Toshinobu Sugioka <sugioka@itonet.co.jp>
diff --git a/arch/sh/kernel/sys_sh.c b/arch/sh/kernel/sys_sh.c
index 58dfc02..15a56be 100644
--- a/arch/sh/kernel/sys_sh.c
+++ b/arch/sh/kernel/sys_sh.c
@@ -63,7 +63,9 @@ asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
- return do_mmap2(addr, len, prot, flags, fd, pgoff);
+ /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
+ we have. */
+ return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
}
/*
SUGIOKA Toshinobu
next reply other threads:[~2009-04-20 21:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-20 21:48 SUGIOKA Toshinobu [this message]
2009-04-20 22:14 ` [PATCH] fix mmap2 syscall Paul Mundt
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