From 064cc44e62283227524c8e84ff247939728dec79 Mon Sep 17 00:00:00 2001 From: Sonic Zhang Date: Fri, 12 Nov 2010 05:54:32 +0000 Subject: [PATCH] Blackfin: SMP: kgdb: flush core internal write buffer before flushinv KGDB single step in SMP kernel may hang forever in flushinv without a CSYNC ahead. This is because the core internal write buffers need to be flushed before invalidating the data cache to make sure the insn fetch is not out of sync. Signed-off-by: Sonic Zhang Signed-off-by: Mike Frysinger --- arch/blackfin/mach-bf561/atomic.S | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S index f99f174b129f..52d6f73fcced 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); @@ -685,6 +686,8 @@ 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 +910,8 @@ 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]; -- 2.30.2