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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>
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@ -21,12 +21,12 @@ typedef struct {
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
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#ifdef CONFIG_MMU
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#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
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#define KERNEL_DS MAKE_MM_SEG(0xdfffffffUL)
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#else
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#define USER_DS KERNEL_DS
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#define USER_DS MAKE_MM_SEG(memory_end)
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#define KERNEL_DS MAKE_MM_SEG(0xe0000000UL)
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#endif
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#define get_ds() (KERNEL_DS)
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@ -27,8 +27,6 @@
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define __addr_ok(addr) ((unsigned long)(addr) < get_addr_limit())
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/*
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* check that a range of addresses falls within the current address limit
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*/
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