CVS commit: src/sys/arch/m68k/include

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sun Feb 13 13:41:44 UTC 2022

Modified Files:
        src/sys/arch/m68k/include: lock.h

Log Message:
m68k: __cpu_simple_unlock audit.

- Use `cc' clobbers in asm volatile because they touch the condition
  codes.

- Use `memory' clobbers in asm volatile so the compiler doesn't move
  up loads and stores in the critical section at _other_ addresses
  than the lock so they happen before __cpu_simple_lock or
  __cpu_simple_lock_try.

- Not sure if we have any (or if there even are any?) multicore m68k
  systems out there, but __cpu_simple_unlock needs __insn_barrier
  either way so the compiler doesn't delay loads and stores prior to
  __cpu_simple_unlock so they happen after it.


To generate a diff of this commit:
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/m68k/include/lock.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.