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powerpc/inst: Add __copy_inst_from_kernel_nofault()
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
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1 changed files with 9 additions and 4 deletions
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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)
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__str; \
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})
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static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
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static inline int __copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
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{
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unsigned int val, suffix;
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if (unlikely(!is_kernel_addr((unsigned long)src)))
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return -ERANGE;
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/* See https://github.com/ClangBuiltLinux/linux/issues/1521 */
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#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 140000
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val = suffix = 0;
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@ -181,4 +178,12 @@ static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
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return -EFAULT;
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}
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static inline int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src)
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{
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if (unlikely(!is_kernel_addr((unsigned long)src)))
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return -ERANGE;
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return __copy_inst_from_kernel_nofault(inst, src);
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}
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#endif /* _ASM_POWERPC_INST_H */
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