diff options
Diffstat (limited to 'arch/blackfin/mach-bf561/atomic.S')
| -rw-r--r-- | arch/blackfin/mach-bf561/atomic.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S index f99f174b129..2a08df8e8c4 100644 --- a/arch/blackfin/mach-bf561/atomic.S +++ b/arch/blackfin/mach-bf561/atomic.S @@ -49,6 +49,7 @@ ENTRY(_get_core_lock) jump .Lretry_corelock .Ldone_corelock: p0 = r1; + /* flush core internal write buffer before invalidate dcache */ CSYNC(r2); flushinv[p0]; SSYNC(r2); @@ -71,6 +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) @@ -685,6 +693,8 @@ ENTRY(___raw_atomic_test_asm) r1 = -L1_CACHE_BYTES; r1 = r0 & r1; p0 = r1; + /* flush core internal write buffer before invalidate dcache */ + CSYNC(r2); flushinv[p0]; SSYNC(r2); r0 = [p1]; @@ -907,6 +917,8 @@ ENTRY(___raw_uncached_fetch_asm) r1 = -L1_CACHE_BYTES; r1 = r0 & r1; p0 = r1; + /* flush core internal write buffer before invalidate dcache */ + CSYNC(r2); flushinv[p0]; SSYNC(r2); r0 = [p1]; |