diff options
| author | Bob Liu <lliubbo@gmail.com> | 2012-01-17 05:06:34 -0500 |
|---|---|---|
| committer | Bob Liu <lliubbo@gmail.com> | 2012-03-20 23:00:07 -0400 |
| commit | a5e0d8652adfc0530b3fce18e54e429287aeee73 (patch) | |
| tree | 06ba5e43b294fc6fa2a057e54144f22eb14eb9f5 /arch/blackfin | |
| parent | 5d002cce4c8a24234b81033119eda3272ebf7981 (diff) | |
blackfin: bf561: forgot CSYNC in get_core_lock_noflush
SMP kgdb runs into dead loop without this CSYNC when one core single
steps over get_core_lock_noflush and the other executes get_core_lock
as a slave node.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/mach-bf561/atomic.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S index 52d6f73fcced..2a08df8e8c4c 100644 --- a/arch/blackfin/mach-bf561/atomic.S +++ b/arch/blackfin/mach-bf561/atomic.S | |||
| @@ -72,6 +72,13 @@ ENTRY(_get_core_lock_noflush) | |||
| 72 | SSYNC(r2); | 72 | SSYNC(r2); |
| 73 | jump .Lretry_corelock_noflush | 73 | jump .Lretry_corelock_noflush |
| 74 | .Ldone_corelock_noflush: | 74 | .Ldone_corelock_noflush: |
| 75 | /* | ||
| 76 | * SMP kgdb runs into dead loop without NOP here, when one core | ||
| 77 | * single steps over get_core_lock_noflush and the other executes | ||
| 78 | * get_core_lock as a slave node. | ||
| 79 | */ | ||
| 80 | nop; | ||
| 81 | CSYNC(r2); | ||
| 75 | rts; | 82 | rts; |
| 76 | ENDPROC(_get_core_lock_noflush) | 83 | ENDPROC(_get_core_lock_noflush) |
| 77 | 84 | ||