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authorVineet Gupta <vgupta@synopsys.com>2016-06-13 16:38:27 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-07 08:32:42 +0200
commit03551c85c1c01bf7ec58218a2afb225d98da0b97 (patch)
tree55b21a4715508da29a4e82f6fe40cc64511b05a3 /arch
parente44f5b5386f49f00d8d62880c28a814e8220c8ed (diff)
ARC: Elide redundant setup of DMA callbacks
commit 45c3b08a117e2232fc8d7b9e849ead36386f4f96 upstream. For resources shared by all cores such as SLC and IOC, only the master core needs to do any setups / enabling / disabling etc. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arc/mm/cache.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index ff7ff6cbb811..aaf1e2d1d900 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -914,6 +914,15 @@ void arc_cache_init(void)
printk(arc_cache_mumbojumbo(0, str, sizeof(str)));
+ /*
+ * Only master CPU needs to execute rest of function:
+ * - Assume SMP so all cores will have same cache config so
+ * any geomtry checks will be same for all
+ * - IOC setup / dma callbacks only need to be setup once
+ */
+ if (cpu)
+ return;
+
if (IS_ENABLED(CONFIG_ARC_HAS_ICACHE)) {
struct cpuinfo_arc_cache *ic = &cpuinfo_arc700[cpu].icache;