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Message-Id: <20090611152558.8510.75249.sendpatchset@linux-fd7s.americas.hpqcorp.net> Date: Thu, 11 Jun 2009 15:26:43 +0000 (UTC) From: Naga Chumbalkar <nagananda.chumbalkar@...com> To: davej@...emonkey.org.uk Cc: Naga Chumbalkar <nagananda.chumbalkar@...com>, andreas.herrmann3@....com, linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org, mark.langsdorf@....com, trenn@...e.de Subject: [PATCH 0/2] powernow-k8: fix incorrect value reported in cpuinfo_cur_freq The "cpuinfo_cur_freq" value reported in /sys is incorrect. For example, on a 1P quad-core AMD platform (cores: 0,1,2,3) if you want the "cpuinfo_cur_freq" for core2, you will actually get the value for core0. The bug is apparent when all the cores are not at the same frequency. Prior to 2.6.27.8, "cpuinfo_cur_freq" used to return the correct value because query_current_values_with_pending_wait() obtained the P-state for core2 from HW, and overwrote the "currpstate" for core0 with it. However, that got broken with the commit: a266d9f1253a38ec2d5655ebcd6846298b0554f4 This patch fixes the regression by: - special-casing the AMD erratum 311 (discussed in the above commit) to AMD Family 11h processors only - cleaning up the way powernowk8_get() obtains the per-CPU data arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 31 +++++++++++----------------- 1 files changed, 12 insertions(+), 19 deletions(-) Thanks, - naga - -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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