Commit 08dc179b authored by David Howells's avatar David Howells Committed by Linus Torvalds

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: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ea56f411
......@@ -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)
......
......@@ -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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