sched/core: Fix context analysis errors in non-preferred CPU push

Nathan reported build failure with clang23 when CONFIG_PREFERRED_CPU=y.

  kernel/sched/core.c:11298:3: error: releasing raw_spinlock 'rq_lockp(rq)' that was not held [-Werror,-Wthread-safety-analysis]
   11298 |                 rq_unlock(rq, &rf);
         |                 ^
  kernel/sched/core.c:11303:1: error: raw_spinlock 'rq_lockp(__this_rq())' is not held on every path through here [-Werror,-Wthread-safety-analysis]

context_unsafe_alias(rq) was placed after rq_lock(), by which point it had
already associated the lock with the original rq alias.

Move the alias barrier before rq_lock() so that the changing rq alias is
accounted for before acquiring the lock.

Fixes: 74699f56ebcf ("sched/core: Push current task from non preferred CPU")
Closes: https://lore.kernel.org/all/20260929121838.GA1814129@ax162/
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Nathan Chancellor <nathan@kernel.org> # build
Link: https://patch.msgid.link/20260929164712.1054883-1-sshegde@linux.ibm.com

0 files changed, 0 insertions, 0 deletions