linux-kernel - [PATCH v1 17/22] powerpc/inst: Add __copy_inst_from_kernel

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Message-Id: <3ff47a837d8dfb6305592f3d8caef6aa2d85fbc2.1648131740.git.christophe.leroy@csgroup.eu>
Date:   Thu, 24 Mar 2022 15:30:07 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 17/22] 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@...roup.eu>
---
 arch/powerpc/include/asm/inst.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
index 80b6d74146c6..b49aae9f6f27 100644
--- a/arch/powerpc/include/asm/inst.h
+++ b/arch/powerpc/include/asm/inst.h
@@ -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 */
-- 
2.35.1