Commit 8dfdbe43 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

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: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1f3702890d6dbd64702b61834753bcc96851c18c.1652074503.git.christophe.leroy@csgroup.eu
parent af8b9f35

arch/powerpc/include/asm/inst.h

+9 −4
Original line number Diff line number Diff line
@@ -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 */