linux-kernel - [PATCH] powerpc/process: Enhance readability for trap types.

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Date:   Sun, 28 Mar 2021 22:35:45 +0800
From:   Xiongwei Song <sxwjean@...com>
To:     mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        npiggin@...il.com, christophe.leroy@...roup.eu,
        ravi.bangoria@...ux.ibm.com, mikey@...ling.org,
        aneesh.kumar@...ux.ibm.com, haren@...ux.ibm.com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Xiongwei Song <sxwjean@...il.com>
Subject: [PATCH] powerpc/process: Enhance readability for trap types.

From: Xiongwei Song <sxwjean@...il.com>

Define macros to enhance the code readability on ppc trap types.

Signed-off-by: Xiongwei Song <sxwjean@...il.com>
---
 arch/powerpc/kernel/process.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 3231c2df9e26..3bbd3cf353a7 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1451,6 +1451,10 @@ static void print_msr_bits(unsigned long val)
 #define LAST_VOLATILE	12
 #endif
 
+#define TRAP_MC  0x200 /* Machine Check */
+#define TRAP_DSI 0x300 /* DSI exception */
+#define TRAP_AM  0x600 /* Alignment exception */
+
 static void __show_regs(struct pt_regs *regs)
 {
 	int i, trap;
@@ -1465,7 +1469,7 @@ static void __show_regs(struct pt_regs *regs)
 	trap = TRAP(regs);
 	if (!trap_is_syscall(regs) && cpu_has_feature(CPU_FTR_CFAR))
 		pr_cont("CFAR: "REG" ", regs->orig_gpr3);
-	if (trap == 0x200 || trap == 0x300 || trap == 0x600) {
+	if (trap == TRAP_MC || trap == TRAP_DSI || trap == TRAP_AM) {
 		if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE))
 			pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, regs->dsisr);
 		else
-- 
2.17.1