[GIT PULL] Report recovery time for CSD-lock stall for v7.4

[Paul E. McKenney]

Hello, Linus,

When the v7.4 merge window opens, please pull this CSD-lock update that
reports the time required to recover from a CSD-lock stall:

  git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/csd-lock.2026.10.12a
  # HEAD: f929e61143a2842e8f8ec9f2319ee19dbb048e32: lib/test_csd_lock: Add a module to stall a CPU on a CSD lock (2026-09-03 10:45:17 -0700)

----------------------------------------------------------------
Report CSD-lock stall recovery time

 * Refactor to simplify csd_lock_wait_toolong() function prototype.
 * Report time required to recover from a CSD-lock stall.
 * Add a test of this reporting.

----------------------------------------------------------------
Breno Leitao (3):
      locking/csd-lock: Pack csd_lock_wait_toolong() state into a struct
      locking/csd-lock: Report how long a stuck CSD lock took to recover
      lib/test_csd_lock: Add a module to stall a CPU on a CSD lock

 kernel/smp.c        |  77 +++++++++++++++--------
 lib/Kconfig.debug   |  12 ++++
 lib/Makefile        |   1 +
 lib/test_csd_lock.c | 173 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 237 insertions(+), 26 deletions(-)
 create mode 100644 lib/test_csd_lock.c