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x86/entry: Get rid of ist_begin/end_non_atomic()

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This is completely overengineered and definitely not an interface which
should be made available to anything else than this particular MCE case.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134059.462640294@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-03-05 00:52:41 +01:00
parent f93524eb9c
commit b052df3da8
3 changed files with 4 additions and 41 deletions
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6
arch/x86/kernel/cpu/mce/core.c
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@@ -1352,13 +1352,15 @@ void notrace do_machine_check(struct pt_regs *regs, long error_code)
/* Fault was in user mode and we need to take some action */
if ((m.cs & 3) == 3) {
ist_begin_non_atomic(regs);
/* If this triggers there is no way to recover. Die hard. */
BUG_ON(!on_thread_stack() || !user_mode(regs));
local_irq_enable();
preempt_enable();
if (kill_it || do_memory_failure(&m))
force_sig(SIGBUS);
preempt_disable();
local_irq_disable();
ist_end_non_atomic();
} else {
if (!fixup_exception(regs, X86_TRAP_MC, error_code, 0))
mce_panic("Failed kernel mode recovery", &m, msg);