riscv: cleanup do_trap_break

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>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 1ac75f7..10a17e5 100644 (file)
--- 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