Re: [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@xxxxxxxxxx> 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