This is a note to let you know that I've just added the patch titled
ARC: Elide redundant setup of DMA callbacks
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arc-elide-redundant-setup-of-dma-callbacks.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 45c3b08a117e2232fc8d7b9e849ead36386f4f96 Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Date: Mon, 13 Jun 2016 16:38:27 +0200
Subject: ARC: Elide redundant setup of DMA callbacks
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from vgupta@xxxxxxxxxxxx are
queue-4.4/arc-build-better-way-to-detect-isa-compatible-toolchain.patch
queue-4.4/arc-elide-redundant-setup-of-dma-callbacks.patch
queue-4.4/arc-call-trace_hardirqs_on-before-enabling-irqs.patch
queue-4.4/arc-use-correct-offset-in-pt_regs-for-saving-restoring-user-mode-r25.patch
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