linux-kernel - [PATCH 2/3] powerpc/uaccess: Switch __patch_instruction() to __put_user_asm

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Message-Id: <b9745b122f4a9ae72cef445c61320022ab8b77b7.1599216721.git.christophe.leroy@csgroup.eu>
Date:   Fri,  4 Sep 2020 11:01:31 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 2/3] powerpc/uaccess: Switch __patch_instruction() to
 __put_user_asm_goto()

__patch_instruction() is the only user of __put_user_asm() outside
of asm/uaccess.h

Switch to the new __put_user_asm_goto() to enable retirement of
__put_user_asm() in a later patch.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/lib/code-patching.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index 8c3934ea6220..2333625b5e31 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -21,21 +21,18 @@
 static int __patch_instruction(struct ppc_inst *exec_addr, struct ppc_inst instr,
 			       struct ppc_inst *patch_addr)
 {
-	int err = 0;
-
-	if (!ppc_inst_prefixed(instr)) {
-		__put_user_asm(ppc_inst_val(instr), patch_addr, err, "stw");
-	} else {
-		__put_user_asm(ppc_inst_as_u64(instr), patch_addr, err, "std");
-	}
-
-	if (err)
-		return err;
+	if (!ppc_inst_prefixed(instr))
+		__put_user_asm_goto(ppc_inst_val(instr), patch_addr, failed, "stw");
+	else
+		__put_user_asm_goto(ppc_inst_as_u64(instr), patch_addr, failed, "std");
 
 	asm ("dcbst 0, %0; sync; icbi 0,%1; sync; isync" :: "r" (patch_addr),
 							    "r" (exec_addr));
 
 	return 0;
+
+failed:
+	return -EFAULT;
 }
 
 int raw_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr)
-- 
2.25.0