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authorBob Liu <lliubbo@gmail.com>2012-01-17 18:06:34 +0800
committerBob Liu <lliubbo@gmail.com>2012-03-21 11:00:07 +0800
commita5e0d8652adfc0530b3fce18e54e429287aeee73 (patch)
tree06ba5e43b294fc6fa2a057e54144f22eb14eb9f5 /arch
parent5d002cce4c8a24234b81033119eda3272ebf7981 (diff)
downloadop-kernel-dev-a5e0d8652adfc0530b3fce18e54e429287aeee73.zip
op-kernel-dev-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>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/mach-bf561/atomic.S7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S
index 52d6f73..2a08df8 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)
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