| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 076/113] ARC: Elide redundant setup of DMA callbacks | Date | Mon, 5 Sep 2016 18:44:39 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Vineet Gupta <vgupta@synopsys.com>
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>
--- arch/arc/mm/cache.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- 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;
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