[0/2] xen/spinlock: cleanup struct spinlock

Message

Jürgen Groß Feb. 24, 2022, 10:54 a.m. UTC

The spinlock data structure contains two cpu fields for storing the
cpu number of the lock holder (one for debug purposes and one for
recursive spinlocks). Merging them removes a build time limitation for
supporting higher cpu numbers than today.

This series is NOT using more bits for storing the cpu number, but
doing that would now be possible. Taking rwlocks into account it would
be possible now to use 14 bits for the cpu, allowing up to 16383 cpus
without growing the lock related data types.

Juergen Gross (2):
  xen/spinlock: use lock address for lock debug functions
  xen/spinlock: merge recurse_cpu and debug.cpu fields in struct
    spinlock

 xen/arch/x86/mm/mm-locks.h |  6 ++--
 xen/common/spinlock.c      | 70 ++++++++++++++++++++------------------
 xen/include/xen/rwlock.h   | 10 +++---
 xen/include/xen/spinlock.h | 53 +++++++++++++++++------------
 4 files changed, 76 insertions(+), 63 deletions(-)