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Subject[PATCH V2] mm, memory_failure: don't send BUS_MCEERR_AO for action required error
Date
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.

Suggested-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Wetp Zhang <wetp.zy@linux.alibaba.com>
---
mm/memory-failure.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index a96364be8ab4..dd3862fcf2e9 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -210,14 +210,17 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
{
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
--
2.14.3 (Apple Git-98)
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