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powerpc/uaccess: Remove __get/put_user_inatomic() 

Powerpc is the only architecture having _inatomic variants of
__get_user() and __put_user() accessors. They were introduced
by commit e68c825bb0 ("[POWERPC] Add inatomic versions of __get_user
and __put_user").

Those variants expand to the _nosleep macros instead of expanding
to the _nocheck macros. The only difference between the _nocheck
and the _nosleep macros is the call to might_fault().

Since commit 662bbcb274 ("mm, sched: Allow uaccess in atomic with
pagefault_disable()"), __get/put_user() can be used in atomic parts
of the code, therefore __get/put_user_inatomic() have become useless.

Remove __get_user_inatomic() and __put_user_inatomic().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1e5c895669e8d54a7810b62dc61eb111f33c2c37.1615398265.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-03-10 17:46:43 +00:00 committed by Michael Ellerman
parent 3fa3db3295
commit bad956b8fe
3 changed files with 2 additions and 39 deletions
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37
arch/powerpc/include/asm/uaccess.h
View File

@ -53,11 +53,6 @@ static inline bool __access_ok(unsigned long addr, unsigned long size)
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user_inatomic(x, ptr) \
__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
#define __put_user_inatomic(x, ptr) \
__put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#ifdef CONFIG_PPC64
#define ___get_user_instr(gu_op, dest, ptr) \
@ -92,9 +87,6 @@ static inline bool __access_ok(unsigned long addr, unsigned long size)
#define __get_user_instr(x, ptr) \
___get_user_instr(__get_user, x, ptr)
#define __get_user_instr_inatomic(x, ptr) \
___get_user_instr(__get_user_inatomic, x, ptr)
extern long __put_user_bad(void);
#define __put_user_size(x, ptr, size, retval) \
@ -141,20 +133,6 @@ __pu_failed: \
__pu_err; \
})
#define __put_user_nosleep(x, ptr, size) \
({ \
long __pu_err; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
__typeof__(size) __pu_size = (size); \
\
__chk_user_ptr(__pu_addr); \
__put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
\
__pu_err; \
})
/*
* We don't tell gcc that we are accessing memory, but this is OK
* because we do not write to any memory gcc knows about, so there
@ -320,21 +298,6 @@ do { \
__gu_err; \
})
#define __get_user_nosleep(x, ptr, size) \
({ \
long __gu_err; \
__long_type(*(ptr)) __gu_val; \
__typeof__(*(ptr)) __user *__gu_addr = (ptr); \
__typeof__(size) __gu_size = (size); \
\
__chk_user_ptr(__gu_addr); \
__get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
\
__gu_err; \
})
/* more complex routines */
extern unsigned long __copy_tofrom_user(void __user *to,

2
arch/powerpc/kernel/hw_breakpoint_constraints.c
View File

@ -141,7 +141,7 @@ void wp_get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
{
struct instruction_op op;
if (__get_user_instr_inatomic(*instr, (void __user *)regs->nip))
if (__get_user_instr(*instr, (void __user *)regs->nip))
return;
analyse_instr(&op, regs, *instr);

2
arch/powerpc/kernel/traps.c
View File

@ -863,7 +863,7 @@ static void p9_hmi_special_emu(struct pt_regs *regs)
unsigned long ea, msr, msr_mask;
bool swap;
if (__get_user_inatomic(instr, (unsigned int __user *)regs->nip))
if (__get_user(instr, (unsigned int __user *)regs->nip))
return;
/*