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uaccess: remove segment_eq

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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 <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Greentime Hu <green.hu@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Link: http://lkml.kernel.org/r/20200710135706.537715-5-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-08-11 18:33:44 -07:00 committed by Linus Torvalds
parent efbfc62e1d
commit 428e2976a5
24 changed files with 25 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/include/asm/uaccess.h
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@ -20,7 +20,7 @@
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
/*
* Is a address valid? This does a straightforward calculation rather

3
arch/arc/include/asm/segment.h
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@ -14,8 +14,7 @@ typedef unsigned long mm_segment_t;
#define KERNEL_DS MAKE_MM_SEG(0)
#define USER_DS MAKE_MM_SEG(TASK_SIZE)
#define segment_eq(a, b) ((a) == (b))
#define uaccess_kernel() (get_fs() == KERNEL_DS)
#endif /* __ASSEMBLY__ */
#endif /* __ASMARC_SEGMENT_H */

4
arch/arm/include/asm/uaccess.h
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@ -76,7 +76,7 @@ static inline void set_fs(mm_segment_t fs)
modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
}
#define segment_eq(a, b) ((a) == (b))
#define uaccess_kernel() (get_fs() == KERNEL_DS)
/*
* We use 33-bit arithmetic here. Success returns zero, failure returns
@ -267,7 +267,7 @@ extern int __put_user_8(void *, unsigned long long);
*/
#define USER_DS KERNEL_DS
#define segment_eq(a, b) (1)
#define uaccess_kernel() (true)
#define __addr_ok(addr) ((void)(addr), 1)
#define __range_ok(addr, size) ((void)(addr), 0)
#define get_fs() (KERNEL_DS)

2
arch/arm64/include/asm/uaccess.h
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@ -50,7 +50,7 @@ static inline void set_fs(mm_segment_t fs)
CONFIG_ARM64_UAO));
}
#define segment_eq(a, b) ((a) == (b))
#define uaccess_kernel() (get_fs() == KERNEL_DS)
/*
* Test whether a block of memory is a valid user space address.

2
arch/csky/include/asm/segment.h
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@ -13,6 +13,6 @@ typedef struct {
#define USER_DS ((mm_segment_t) { 0x80000000UL })
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif /* __ASM_CSKY_SEGMENT_H */

2
arch/h8300/include/asm/segment.h
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@ -33,7 +33,7 @@ static inline mm_segment_t get_fs(void)
return USER_DS;
}
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif /* __ASSEMBLY__ */

2
arch/ia64/include/asm/uaccess.h
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@ -50,7 +50,7 @@
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
/*
* When accessing user memory, we need to make sure the entire area really is in

2
arch/m68k/include/asm/segment.h
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@ -52,7 +52,7 @@ static inline void set_fs(mm_segment_t val)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#endif
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif /* __ASSEMBLY__ */

2
arch/microblaze/include/asm/uaccess.h
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@ -41,7 +41,7 @@
# define get_fs() (current_thread_info()->addr_limit)
# define set_fs(val) (current_thread_info()->addr_limit = (val))
# define segment_eq(a, b) ((a).seg == (b).seg)
# define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#ifndef CONFIG_MMU

2
arch/mips/include/asm/uaccess.h
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@ -72,7 +72,7 @@ extern u64 __ua_limit;
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
/*
* eva_kernel_access() - determine whether kernel memory access on an EVA system

2
arch/nds32/include/asm/uaccess.h
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@ -44,7 +44,7 @@ static inline void set_fs(mm_segment_t fs)
current_thread_info()->addr_limit = fs;
}
#define segment_eq(a, b) ((a) == (b))
#define uaccess_kernel() (get_fs() == KERNEL_DS)
#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))

2
arch/nios2/include/asm/uaccess.h
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@ -30,7 +30,7 @@
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(seg) (current_thread_info()->addr_limit = (seg))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define __access_ok(addr, len) \
(((signed long)(((long)get_fs().seg) & \

2
arch/openrisc/include/asm/uaccess.h
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@ -43,7 +43,7 @@
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a) == (b))
#define uaccess_kernel() (get_fs() == KERNEL_DS)
/* Ensure that the range from addr to addr+size is all within the process'
* address space

2
arch/parisc/include/asm/uaccess.h
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@ -14,7 +14,7 @@
#define KERNEL_DS ((mm_segment_t){0})
#define USER_DS ((mm_segment_t){1})
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))

3
arch/powerpc/include/asm/uaccess.h
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@ -38,8 +38,7 @@ static inline void set_fs(mm_segment_t fs)
set_thread_flag(TIF_FSCHECK);
}
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define user_addr_max() (get_fs().seg)
#ifdef __powerpc64__

4
arch/riscv/include/asm/uaccess.h
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@ -64,11 +64,9 @@ static inline void set_fs(mm_segment_t fs)
current_thread_info()->addr_limit = fs;
}
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define user_addr_max() (get_fs().seg)
/**
* access_ok: - Checks if a user space pointer is valid
* @addr: User space pointer to start of block to check

2
arch/s390/include/asm/uaccess.h
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@ -32,7 +32,7 @@
#define USER_DS_SACF (3)
#define get_fs() (current->thread.mm_segment)
#define segment_eq(a,b) (((a) & 2) == ((b) & 2))
#define uaccess_kernel() ((get_fs() & 2) == KERNEL_DS)
void set_fs(mm_segment_t fs);

3
arch/sh/include/asm/segment.h
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@ -24,8 +24,7 @@ typedef struct {
#define USER_DS KERNEL_DS
#endif
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))

2
arch/sparc/include/asm/uaccess_32.h
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@ -28,7 +28,7 @@
#define get_fs() (current->thread.current_ds)
#define set_fs(val) ((current->thread.current_ds) = (val))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
/* We have there a nice not-mapped page at PAGE_OFFSET - PAGE_SIZE, so that this test
* can be fairly lightweight.

2
arch/sparc/include/asm/uaccess_64.h
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@ -32,7 +32,7 @@
#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define set_fs(val) \
do { \

2
arch/x86/include/asm/uaccess.h
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@ -33,7 +33,7 @@ static inline void set_fs(mm_segment_t fs)
set_thread_flag(TIF_FSCHECK);
}
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define user_addr_max() (current->thread.addr_limit.seg)
/*

2
arch/xtensa/include/asm/uaccess.h
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@ -35,7 +35,7 @@
#define get_fs() (current->thread.current_ds)
#define set_fs(val) (current->thread.current_ds = (val))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define __kernel_ok (uaccess_kernel())
#define __user_ok(addr, size) \

4
include/asm-generic/uaccess.h
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@ -86,8 +86,8 @@ static inline void set_fs(mm_segment_t fs)
}
#endif
#ifndef segment_eq
#define segment_eq(a, b) ((a).seg == (b).seg)
#ifndef uaccess_kernel
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif
#define access_ok(addr, size) __access_ok((unsigned long)(addr),(size))

2
include/linux/uaccess.h
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@ -6,8 +6,6 @@
#include <linux/sched.h>
#include <linux/thread_info.h>
#define uaccess_kernel() segment_eq(get_fs(), KERNEL_DS)
#include <asm/uaccess.h>
/*