From 08dc179b9b00cfbed006ae6f5d0e471ef79dc69c Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Tue, 6 Apr 2010 14:35:09 -0700
Subject: [PATCH] frv: fix kernel/user segment handling in NOMMU mode
In NOMMU mode, the FRV segment handling is broken because KERNEL_DS ==
USER_DS. This causes tests of the following sort:
/* don't pin down non-user-based iovecs */
if (segment_eq(get_fs(), KERNEL_DS))
return NULL;
to malfunction.
To fix this, make USER_DS the top of RAM instead of the top of the non-IO
address space, and make KERNEL_DS one more than the top of the non-IO
address space.
Also get rid of FRV's __addr_ok() as nothing uses it.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/frv/include/asm/segment.h | 6 +++---
arch/frv/include/asm/uaccess.h | 2 --
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch/frv/include/asm/segment.h b/arch/frv/include/asm/segment.h
index e3616a6f941d..a2320a4a0042 100644
--- a/arch/frv/include/asm/segment.h
+++ b/arch/frv/include/asm/segment.h
@@ -21,12 +21,12 @@ typedef struct {
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-#define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
-
#ifdef CONFIG_MMU
#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
+#define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
#else
-#define USER_DS KERNEL_DS
+#define USER_DS MAKE_MM_SEG(memory_end)
+#define KERNEL_DS MAKE_MM_SEG(0xe0000000UL)
#endif
#define get_ds() (KERNEL_DS)
diff --git a/arch/frv/include/asm/uaccess.h b/arch/frv/include/asm/uaccess.h
index 53650c958f41..0b67ec5b4414 100644
--- a/arch/frv/include/asm/uaccess.h
+++ b/arch/frv/include/asm/uaccess.h
@@ -27,8 +27,6 @@
#define VERIFY_READ 0
#define VERIFY_WRITE 1
-#define __addr_ok(addr) ((unsigned long)(addr) < get_addr_limit())
-
/*
* check that a range of addresses falls within the current address limit
*/
--
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