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authorAndrea Parri <parri.andrea@gmail.com>2020-01-09 19:06:49 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-01-16 21:09:02 +0300
commit0af3e137c144377fbaf5025ba784ff5ba7ad40c9 (patch)
treee7061dcf97329e37ca4a45d5882a6582765da744 /include/clocksource
parentb9c60a741f06eda56d12c7216accb317b74266b4 (diff)
downloadlinux-0af3e137c144377fbaf5025ba784ff5ba7ad40c9.tar.xz
clocksource/drivers/hyper-v: Untangle stimers and timesync from clocksources
hyperv_timer.c exports hyperv_cs, which is used by stimers and the timesync mechanism. However, the clocksource dependency is not needed: these mechanisms only depend on the partition reference counter (which can be read via a MSR or via the TSC Reference Page). Introduce the (function) pointer hv_read_reference_counter, as an embodiment of the partition reference counter read, and export it in place of the hyperv_cs pointer. The latter can be removed. This should clarify that there's no relationship between Hyper-V stimers & timesync and the Linux clocksource abstractions. No functional or semantic change. Suggested-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Andrea Parri <parri.andrea@gmail.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200109160650.16150-2-parri.andrea@gmail.com
Diffstat (limited to 'include/clocksource')
-rw-r--r--include/clocksource/hyperv_timer.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/clocksource/hyperv_timer.h b/include/clocksource/hyperv_timer.h
index 553e539469f0..34eef083c988 100644
--- a/include/clocksource/hyperv_timer.h
+++ b/include/clocksource/hyperv_timer.h
@@ -30,7 +30,7 @@ extern void hv_stimer_global_cleanup(void);
extern void hv_stimer0_isr(void);
#ifdef CONFIG_HYPERV_TIMER
-extern struct clocksource *hyperv_cs;
+extern u64 (*hv_read_reference_counter)(void);
extern void hv_init_clocksource(void);
extern struct ms_hyperv_tsc_page *hv_get_tsc_page(void);