Merge: Sched: update softirq to use bit waits

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/1113

JIRA: https://issues.redhat.com/browse/RHEL-96261

Enhance wake_up/wait_on_bit() and related code and have softirq use
that instead of more complicated wake_up_var(). This cleans up the
code and removes a few explicit memory barriers.

Omitted-fix: 7266f0a  This is a merge commit which mentions two versions of a bcachefs fix related to these commits which we already have in el10 since it actually came in with v6.12.

Signed-off-by: Phil Auld <pauld@redhat.com>

Approved-by: Waiman Long <longman@redhat.com>
Approved-by: Herton R. Krzesinski <herton@redhat.com>
Approved-by: Rafael Aquini <raquini@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: CKI GitLab Kmaint Pipeline Bot <26919896-cki-kmaint-pipeline-bot@users.noreply.gitlab.com>

Author: CKI KWF Bot