linux-kernel - [PATCH v2 1/2] mips/kgdb: prepare arch_kgdb

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Message-Id: <030d63848e4b0ef4d76ca24597ab8302a393d692.1544083483.git.christophe.leroy@c-s.fr>
Date:   Thu,  6 Dec 2018 20:07:38 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Richard Kuo <rkuo@...eaurora.org>,
        Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Ley Foon Tan <lftan@...era.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        "GitAuthor: Christophe Leroy" <christophe.leroy@....fr>,
        Douglas Anderson <dianders@...omium.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-hexagon@...r.kernel.org, linux-mips@...r.kernel.org,
        nios2-dev@...ts.rocketboards.org, linuxppc-dev@...ts.ozlabs.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        kgdb-bugreport@...ts.sourceforge.net
Subject: [PATCH v2 1/2] mips/kgdb: prepare arch_kgdb_ops for constness

MIPS is the only architecture modifying arch_kgdb_ops during init.
This patch makes the init static, so that it can be changed to
const in following patch, as recommended by checkpatch.pl

Suggested-by: Paul Burton <paul.burton@...s.com>
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
Acked-by: Paul Burton <paul.burton@...s.com>
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 v2: Added acks from Daniel and Paul.

 arch/mips/kernel/kgdb.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
index eb6c0d582626..31eff1bec577 100644
--- a/arch/mips/kernel/kgdb.c
+++ b/arch/mips/kernel/kgdb.c
@@ -394,18 +394,16 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
 	return -1;
 }
 
-struct kgdb_arch arch_kgdb_ops;
+struct kgdb_arch arch_kgdb_ops = {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+	.gdb_bpt_instr = { spec_op << 2, 0x00, 0x00, break_op },
+#else
+	.gdb_bpt_instr = { break_op, 0x00, 0x00, spec_op << 2 },
+#endif
+};
 
 int kgdb_arch_init(void)
 {
-	union mips_instruction insn = {
-		.r_format = {
-			.opcode = spec_op,
-			.func	= break_op,
-		}
-	};
-	memcpy(arch_kgdb_ops.gdb_bpt_instr, insn.byte, BREAK_INSTR_SIZE);
-
 	register_die_notifier(&kgdb_notifier);
 
 	return 0;
-- 
2.13.3