mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-31 22:34:33 +01:00
Christoph Hellwig
428e2976a5
segment_eq is only used to implement uaccess_kernel. Just open code uaccess_kernel in the arch uaccess headers and remove one layer of indirection. Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Acked-by: Linus Torvalds <[email protected]> Acked-by: Greentime Hu <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Cc: Nick Hu <[email protected]> Cc: Vincent Chen <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Palmer Dabbelt <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>
34 lines
860 B
C
34 lines
860 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_SEGMENT_H
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#define __ASM_SH_SEGMENT_H
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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/*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*/
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
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#ifdef CONFIG_MMU
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#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
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#else
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#define USER_DS KERNEL_DS
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#endif
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#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
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#define get_fs() (current_thread_info()->addr_limit)
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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_SH_SEGMENT_H */
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