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From: Christoph Hellwig <hch@lst.de>
To: Palmer Dabbelt <palmer@sifive.com>,
	Paul Walmsley <paul.walmsley@sifive.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 02/15] riscv: cleanup do_trap_break
Date: Thu, 17 Oct 2019 19:37:30 +0200	[thread overview]
Message-ID: <20191017173743.5430-3-hch@lst.de> (raw)
In-Reply-To: <20191017173743.5430-1-hch@lst.de>

If we always compile the get_break_insn_length inline function we can
remove the ifdefs and let dead code elimination take care of the warn
branch that is now unreadable because the report_bug stub always
returns BUG_TRAP_TYPE_BUG.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/kernel/traps.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 1ac75f7d0bff..10a17e545f43 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -111,7 +111,6 @@ DO_ERROR_INFO(do_trap_ecall_s,
 DO_ERROR_INFO(do_trap_ecall_m,
 	SIGILL, ILL_ILLTRP, "environment call from M-mode");
 
-#ifdef CONFIG_GENERIC_BUG
 static inline unsigned long get_break_insn_length(unsigned long pc)
 {
 	bug_insn_t insn;
@@ -120,28 +119,15 @@ static inline unsigned long get_break_insn_length(unsigned long pc)
 		return 0;
 	return (((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ? 4UL : 2UL);
 }
-#endif /* CONFIG_GENERIC_BUG */
 
 asmlinkage void do_trap_break(struct pt_regs *regs)
 {
-	if (user_mode(regs)) {
-		force_sig_fault(SIGTRAP, TRAP_BRKPT,
-				(void __user *)(regs->sepc));
-		return;
-	}
-#ifdef CONFIG_GENERIC_BUG
-	{
-		enum bug_trap_type type;
-
-		type = report_bug(regs->sepc, regs);
-		if (type == BUG_TRAP_TYPE_WARN) {
-			regs->sepc += get_break_insn_length(regs->sepc);
-			return;
-		}
-	}
-#endif /* CONFIG_GENERIC_BUG */
-
-	die(regs, "Kernel BUG");
+	if (user_mode(regs))
+		force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->sepc);
+	else if (report_bug(regs->sepc, regs) == BUG_TRAP_TYPE_WARN)
+		regs->sepc += get_break_insn_length(regs->sepc);
+	else
+		die(regs, "Kernel BUG");
 }
 
 #ifdef CONFIG_GENERIC_BUG
-- 
2.20.1


WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Palmer Dabbelt <palmer@sifive.com>,
	Paul Walmsley <paul.walmsley@sifive.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 02/15] riscv: cleanup do_trap_break
Date: Thu, 17 Oct 2019 19:37:30 +0200	[thread overview]
Message-ID: <20191017173743.5430-3-hch@lst.de> (raw)
In-Reply-To: <20191017173743.5430-1-hch@lst.de>

If we always compile the get_break_insn_length inline function we can
remove the ifdefs and let dead code elimination take care of the warn
branch that is now unreadable because the report_bug stub always
returns BUG_TRAP_TYPE_BUG.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/kernel/traps.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 1ac75f7d0bff..10a17e545f43 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -111,7 +111,6 @@ DO_ERROR_INFO(do_trap_ecall_s,
 DO_ERROR_INFO(do_trap_ecall_m,
 	SIGILL, ILL_ILLTRP, "environment call from M-mode");
 
-#ifdef CONFIG_GENERIC_BUG
 static inline unsigned long get_break_insn_length(unsigned long pc)
 {
 	bug_insn_t insn;
@@ -120,28 +119,15 @@ static inline unsigned long get_break_insn_length(unsigned long pc)
 		return 0;
 	return (((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ? 4UL : 2UL);
 }
-#endif /* CONFIG_GENERIC_BUG */
 
 asmlinkage void do_trap_break(struct pt_regs *regs)
 {
-	if (user_mode(regs)) {
-		force_sig_fault(SIGTRAP, TRAP_BRKPT,
-				(void __user *)(regs->sepc));
-		return;
-	}
-#ifdef CONFIG_GENERIC_BUG
-	{
-		enum bug_trap_type type;
-
-		type = report_bug(regs->sepc, regs);
-		if (type == BUG_TRAP_TYPE_WARN) {
-			regs->sepc += get_break_insn_length(regs->sepc);
-			return;
-		}
-	}
-#endif /* CONFIG_GENERIC_BUG */
-
-	die(regs, "Kernel BUG");
+	if (user_mode(regs))
+		force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->sepc);
+	else if (report_bug(regs->sepc, regs) == BUG_TRAP_TYPE_WARN)
+		regs->sepc += get_break_insn_length(regs->sepc);
+	else
+		die(regs, "Kernel BUG");
 }
 
 #ifdef CONFIG_GENERIC_BUG
-- 
2.20.1


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  parent reply	other threads:[~2019-10-17 17:37 UTC|newest]

Thread overview: 82+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-17 17:37 RISC-V nommu support v5 Christoph Hellwig
2019-10-17 17:37 ` Christoph Hellwig
2019-10-17 17:37 ` [PATCH 01/15] riscv: cleanup <asm/bug.h> Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:50   ` Anup Patel
2019-10-18  2:50     ` Anup Patel
2019-10-23 22:04   ` Paul Walmsley
2019-10-23 22:04     ` Paul Walmsley
2019-10-17 17:37 ` Christoph Hellwig [this message]
2019-10-17 17:37   ` [PATCH 02/15] riscv: cleanup do_trap_break Christoph Hellwig
2019-10-18  2:51   ` Anup Patel
2019-10-18  2:51     ` Anup Patel
2019-10-23 22:05   ` Paul Walmsley
2019-10-23 22:05     ` Paul Walmsley
2019-10-17 17:37 ` [PATCH 03/15] riscv: abstract out CSR names for supervisor vs machine mode Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:51   ` Anup Patel
2019-10-18  2:51     ` Anup Patel
2019-10-18 23:55   ` Paul Walmsley
2019-10-18 23:55     ` Paul Walmsley
2019-10-28  8:12     ` Christoph Hellwig
2019-10-28  8:12       ` Christoph Hellwig
2019-10-17 17:37 ` [PATCH 04/15] riscv: don't allow selecting SBI based drivers for M-mode Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:52   ` Anup Patel
2019-10-18  2:52     ` Anup Patel
2019-10-17 17:37 ` [PATCH 05/15] riscv: poison SBI calls " Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:53   ` Anup Patel
2019-10-18  2:53     ` Anup Patel
2019-10-17 17:37 ` [PATCH 06/15] riscv: cleanup the default power off implementation Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:53   ` Anup Patel
2019-10-18  2:53     ` Anup Patel
2019-10-17 17:37 ` [PATCH 07/15] riscv: implement remote sfence.i using IPIs Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:55   ` Anup Patel
2019-10-18  2:55     ` Anup Patel
2019-10-17 17:37 ` [PATCH 08/15] riscv: add support for MMIO access to the timer registers Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  2:57   ` Anup Patel
2019-10-18  2:57     ` Anup Patel
2019-10-17 17:37 ` [PATCH 09/15] riscv: provide native clint access for M-mode Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:00   ` Anup Patel
2019-10-18  3:00     ` Anup Patel
2019-11-14  7:39   ` Paul Walmsley
2019-11-14  7:39     ` Paul Walmsley
2019-10-17 17:37 ` [PATCH 10/15] riscv: read the hart ID from mhartid on boot Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:01   ` Anup Patel
2019-10-18  3:01     ` Anup Patel
2019-11-14  7:40   ` Paul Walmsley
2019-11-14  7:40     ` Paul Walmsley
2019-10-17 17:37 ` [PATCH 11/15] riscv: use the correct interrupt levels for M-mode Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:01   ` Anup Patel
2019-10-18  3:01     ` Anup Patel
2019-10-17 17:37 ` [PATCH 12/15] riscv: clear the instruction cache and all registers when booting Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:05   ` Anup Patel
2019-10-18  3:05     ` Anup Patel
2019-10-17 17:37 ` [PATCH 13/15] riscv: add nommu support Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:04   ` Anup Patel
2019-10-18  3:04     ` Anup Patel
2019-10-17 17:37 ` [PATCH 14/15] riscv: provide a flat image loader Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:06   ` Anup Patel
2019-10-18  3:06     ` Anup Patel
2019-10-17 17:37 ` [PATCH 15/15] riscv: disable the EFI PECOFF header for M-mode Christoph Hellwig
2019-10-17 17:37   ` Christoph Hellwig
2019-10-18  3:06   ` Anup Patel
2019-10-18  3:06     ` Anup Patel
2019-10-18  3:08 ` RISC-V nommu support v5 Anup Patel
2019-10-18  3:08   ` Anup Patel
2019-10-18  3:29   ` Paul Walmsley
2019-10-18  3:29     ` Paul Walmsley
2019-10-18 15:25     ` Christoph Hellwig
2019-10-18 15:25       ` Christoph Hellwig
2019-10-18 23:46       ` Paul Walmsley
2019-10-18 23:46         ` Paul Walmsley

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