linux-kernel - [PATCH 3.18 43/69] powerpc/powernv/cpufreq: Fix the frequency read by /proc/cpuinfo

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Message-Id: <20171218152744.142090185@linuxfoundation.org>
Date:   Mon, 18 Dec 2017 16:48:29 +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, Shriya <shriyak@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 3.18 43/69] powerpc/powernv/cpufreq: Fix the frequency read by /proc/cpuinfo

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shriya <shriyak@...ux.vnet.ibm.com>


[ Upstream commit cd77b5ce208c153260ed7882d8910f2395bfaabd ]

The call to /proc/cpuinfo in turn calls cpufreq_quick_get() which
returns the last frequency requested by the kernel, but may not
reflect the actual frequency the processor is running at. This patch
makes a call to cpufreq_get() instead which returns the current
frequency reported by the hardware.

Fixes: fb5153d05a7d ("powerpc: powernv: Implement ppc_md.get_proc_freq()")
Signed-off-by: Shriya <shriyak@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/platforms/powernv/setup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -319,7 +319,7 @@ static unsigned long pnv_get_proc_freq(u
 {
 	unsigned long ret_freq;
 
-	ret_freq = cpufreq_quick_get(cpu) * 1000ul;
+	ret_freq = cpufreq_get(cpu) * 1000ul;
 
 	/*
 	 * If the backend cpufreq driver does not exist,