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| author | Bob Liu <lliubbo@gmail.com> | 2012-01-17 18:06:34 +0800 |
|---|---|---|
| committer | Bob Liu <lliubbo@gmail.com> | 2012-03-21 11:00:07 +0800 |
| commit | a5e0d8652adfc0530b3fce18e54e429287aeee73 (patch) | |
| tree | 06ba5e43b294fc6fa2a057e54144f22eb14eb9f5 | |
| parent | 5d002cce4c8a24234b81033119eda3272ebf7981 (diff) | |
| download | linux-next-a5e0d8652adfc0530b3fce18e54e429287aeee73.tar.gz | |
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>
| -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) SSYNC(r2); jump .Lretry_corelock_noflush .Ldone_corelock_noflush: + /* + * SMP kgdb runs into dead loop without NOP here, when one core + * single steps over get_core_lock_noflush and the other executes + * get_core_lock as a slave node. + */ + nop; + CSYNC(r2); rts; ENDPROC(_get_core_lock_noflush) |