From: Wetp Zhang <wetp.zy@xxxxxxxxxxxxxxxxx> Subject: mm, memory_failure: don't send BUS_MCEERR_AO for action required error Some processes dont't want to be killed early, but in "Action Required" case, those also may be killed by BUS_MCEERR_AO when sharing memory with other which is accessing the fail memory. And sending SIGBUS with BUS_MCEERR_AO for action required error is strange, so ignore the non-current processes here. Link: http://lkml.kernel.org/r/1590817116-21281-1-git-send-email-wetp.zy@xxxxxxxxxxxxxxxxx Signed-off-by: Wetp Zhang <wetp.zy@xxxxxxxxxxxxxxxxx> Suggested-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx> Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx> Acked-by: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memory-failure.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) --- a/mm/memory-failure.c~mm-memory_failure-dont-send-bus_mceerr_ao-for-action-required-error +++ a/mm/memory-failure.c @@ -210,14 +210,17 @@ static int kill_proc(struct to_kill *tk, { struct task_struct *t = tk->tsk; short addr_lsb = tk->size_shift; - int ret; + int ret = 0; - pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n", - pfn, t->comm, t->pid); + if ((t->mm == current->mm) || !(flags & MF_ACTION_REQUIRED)) + pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n", + pfn, t->comm, t->pid); - if ((flags & MF_ACTION_REQUIRED) && t->mm == current->mm) { - ret = force_sig_mceerr(BUS_MCEERR_AR, (void __user *)tk->addr, - addr_lsb); + if (flags & MF_ACTION_REQUIRED) { + if (t->mm == current->mm) + ret = force_sig_mceerr(BUS_MCEERR_AR, + (void __user *)tk->addr, addr_lsb); + /* send no signal to non-current processes */ } else { /* * Don't use force here, it's convenient if the signal _
