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powerpc/inst: Add __copy_inst_from_kernel_nofault()

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On the same model as get_user() versus __get_user(),
introduce __copy_inst_from_kernel_nofault() which doesn't
check address.

To be used by callers that have already checked that the adress
is a kernel address.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1f3702890d6dbd64702b61834753bcc96851c18c.1652074503.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-05-09 07:36:18 +02:00 committed by Michael Ellerman
parent af8b9f352f
commit 8dfdbe4368
1 changed files with 9 additions and 4 deletions
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13
arch/powerpc/include/asm/inst.h
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@ -158,13 +158,10 @@ static inline char *__ppc_inst_as_str(char str[PPC_INST_STR_LEN], ppc_inst_t x)
__str; \
})
static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
static inline int __copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
{
unsigned int val, suffix;
if (unlikely(!is_kernel_addr((unsigned long)src)))
return -ERANGE;
/* See https://github.com/ClangBuiltLinux/linux/issues/1521 */
#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 140000
val = suffix = 0;
@ -181,4 +178,12 @@ static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
return -EFAULT;
}
static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
{
if (unlikely(!is_kernel_addr((unsigned long)src)))
return -ERANGE;
return __copy_inst_from_kernel_nofault(inst, src);
}
#endif /* _ASM_POWERPC_INST_H */