[PATCH] kexec: change locking mechanism to a mutex

[Eric DeVolder]

On 9/21/23 19:22, Andrew Morton wrote:
> On Thu, 21 Sep 2023 17:59:38 -0400 Eric DeVolder <eric.devolder at oracle.com> wrote:
> 
>> Scaled up testing has revealed that the kexec_trylock()
>> implementation leads to failures within the crash hotplug
>> infrastructure due to the inability to acquire the lock,
>> specifically the message:
>>
>> ...
>>
>> Convert the atomic lock to a mutex.
>>
> 
> Do you think this problem is serious enough to warrant a backport into
> -stable kernels?

I do not since it will be the lock traffic created by the crash hotplug infrastructure that will 
reveal the weak locking mechanism. Until this crash hotplug shows up in a stable kernel, it should 
not be an issue; there isn't anything else that easily exercise it to reveal the problem.

eric