Commit 03da3ff1 authored Sep 16, 2015 by David Woodhouse Committed by Ingo Molnar Sep 16, 2015

x86/platform: Fix Geode LX timekeeping in the generic x86 build

In 2007, commit 07190a08 ("Mark TSC on GeodeLX reliable")
bypassed verification of the TSC on Geode LX. However, this code
(now in the check_system_tsc_reliable() function in
arch/x86/kernel/tsc.c) was only present if CONFIG_MGEODE_LX was
set.

OpenWRT has recently started building its generic Geode target
for Geode GX, not LX, to include support for additional
platforms. This broke the timekeeping on LX-based devices,
because the TSC wasn't marked as reliable:
https://dev.openwrt.org/ticket/20531



By adding a runtime check on is_geode_lx(), we can also include
the fix if CONFIG_MGEODEGX1 or CONFIG_X86_GENERIC are set, thus
fixing the problem.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: Andres Salomon <dilinger@queued.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marcelo Tosatti <marcelo@kvack.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1442409003.131189.87.camel@infradead.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 5d7c631d

arch/x86/kernel/tsc.c

+10 −7

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@
		#include <asm/hypervisor.h>
		#include <asm/nmi.h>
		#include <asm/x86_init.h>
		#include <asm/geode.h>

		unsigned int __read_mostly cpu_khz; /* TSC clocks / usec, not used here */
		EXPORT_SYMBOL(cpu_khz);
		@@ -1015,7 +1016,8 @@ EXPORT_SYMBOL_GPL(mark_tsc_unstable);

		static void __init check_system_tsc_reliable(void)
		{
		#ifdef CONFIG_MGEODE_LX
		#if defined(CONFIG_MGEODEGX1) \|\| defined(CONFIG_MGEODE_LX) \|\| defined(CONFIG_X86_GENERIC)
		if (is_geode_lx()) {
		/* RTSC counts during suspend */
		#define RTSC_SUSP 0x100
		unsigned long res_low, res_high;
		@@ -1024,6 +1026,7 @@ static void __init check_system_tsc_reliable(void)
		/* Geode_LX - the OLPC CPU has a very reliable TSC */
		if (res_low & RTSC_SUSP)
		tsc_clocksource_reliable = 1;
		}
		#endif
		if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE))
		tsc_clocksource_reliable = 1;

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