linux-kernel - [PATCH 4.19 146/264] powerpc/tau: Remove duplicated set

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Message-Id: <20201027135437.542154161@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:53:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Finn Thain <fthain@...egraphics.com.au>,
        Stan Johnson <userm57@...oo.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 146/264] powerpc/tau: Remove duplicated set_thresholds() call

From: Finn Thain <fthain@...egraphics.com.au>

[ Upstream commit 420ab2bc7544d978a5d0762ee736412fe9c796ab ]

The commentary at the call site seems to disagree with the code. The
conditional prevents calling set_thresholds() via the exception handler,
which appears to crash. Perhaps that's because it immediately triggers
another TAU exception. Anyway, calling set_thresholds() from TAUupdate()
is redundant because tau_timeout() does so.

Fixes: 1da177e4c3f41 ("Linux-2.6.12-rc2")
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/d7c7ee33232cf72a6a6bbb6ef05838b2e2b113c0.1599260540.git.fthain@telegraphics.com.au
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/kernel/tau_6xx.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/powerpc/kernel/tau_6xx.c b/arch/powerpc/kernel/tau_6xx.c
index 268205cc347da..b8d7e7d498e0a 100644
--- a/arch/powerpc/kernel/tau_6xx.c
+++ b/arch/powerpc/kernel/tau_6xx.c
@@ -110,11 +110,6 @@ static void TAUupdate(int cpu)
 #ifdef DEBUG
 	printk("grew = %d\n", tau[cpu].grew);
 #endif
-
-#ifndef CONFIG_TAU_INT /* tau_timeout will do this if not using interrupts */
-	set_thresholds(cpu);
-#endif
-
 }
 
 #ifdef CONFIG_TAU_INT
-- 
2.25.1