HWPOISON: Clean up PR_MCE_KILL interface
While writing the manpage I noticed some shortcomings in the current interface. - Define symbolic names for all the different values - Boundary check the kill mode values - For symmetry add a get interface too. This allows library code to get/set the current state. - For consistency define a PR_MCE_KILL_DEFAULT value Signed-off-by: Andi Kleen <ak@linux.intel.com>
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@ -88,6 +88,18 @@
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#define PR_TASK_PERF_EVENTS_DISABLE 31
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#define PR_TASK_PERF_EVENTS_ENABLE 32
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/*
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* Set early/late kill mode for hwpoison memory corruption.
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* This influences when the process gets killed on a memory corruption.
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*/
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#define PR_MCE_KILL 33
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# define PR_MCE_KILL_CLEAR 0
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# define PR_MCE_KILL_SET 1
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# define PR_MCE_KILL_LATE 0
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# define PR_MCE_KILL_EARLY 1
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# define PR_MCE_KILL_DEFAULT 2
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#define PR_MCE_KILL_GET 34
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#endif /* _LINUX_PRCTL_H */
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23
kernel/sys.c
23
kernel/sys.c
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@ -1546,24 +1546,37 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
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if (arg4 | arg5)
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return -EINVAL;
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switch (arg2) {
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case 0:
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case PR_MCE_KILL_CLEAR:
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if (arg3 != 0)
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return -EINVAL;
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current->flags &= ~PF_MCE_PROCESS;
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break;
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case 1:
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case PR_MCE_KILL_SET:
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current->flags |= PF_MCE_PROCESS;
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if (arg3 != 0)
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if (arg3 == PR_MCE_KILL_EARLY)
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current->flags |= PF_MCE_EARLY;
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else
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else if (arg3 == PR_MCE_KILL_LATE)
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current->flags &= ~PF_MCE_EARLY;
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else if (arg3 == PR_MCE_KILL_DEFAULT)
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current->flags &=
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~(PF_MCE_EARLY|PF_MCE_PROCESS);
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else
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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error = 0;
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break;
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case PR_MCE_KILL_GET:
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if (arg2 | arg3 | arg4 | arg5)
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return -EINVAL;
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if (current->flags & PF_MCE_PROCESS)
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error = (current->flags & PF_MCE_EARLY) ?
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PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE;
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else
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error = PR_MCE_KILL_DEFAULT;
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break;
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default:
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error = -EINVAL;
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break;
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