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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>
This commit is contained in:
Christoph Hellwig 2019-10-17 19:37:30 +02:00 committed by Paul Walmsley
parent a6d9e26726
commit e8f44c50df
1 changed files with 6 additions and 20 deletions
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26
arch/riscv/kernel/traps.c
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@ -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