linux-kernel - [PATCH v5 01/18] watchdog/perf: Define dummy watchdog_update_hrtimer

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Date:   Fri, 19 May 2023 10:18:25 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        kgdb-bugreport@...ts.sourceforge.net,
        Stephane Eranian <eranian@...gle.com>, mpe@...erman.id.au,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        linuxppc-dev@...ts.ozlabs.org, Sumit Garg <sumit.garg@...aro.org>,
        npiggin@...il.com, davem@...emloft.net,
        Marc Zyngier <maz@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, sparclinux@...r.kernel.org,
        christophe.leroy@...roup.eu,
        Catalin Marinas <catalin.marinas@....com>,
        ravi.v.shankar@...el.com, Randy Dunlap <rdunlap@...radead.org>,
        Pingfan Liu <kernelfans@...il.com>,
        Guenter Roeck <groeck@...omium.org>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Ian Rogers <irogers@...gle.com>, ito-yuichi@...itsu.com,
        ricardo.neri@...el.com, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, Will Deacon <will@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Douglas Anderson <dianders@...omium.org>
Subject: [PATCH v5 01/18] watchdog/perf: Define dummy watchdog_update_hrtimer_threshold() on correct config

The real watchdog_update_hrtimer_threshold() is defined in
kernel/watchdog_hld.c. That file is included if
CONFIG_HARDLOCKUP_DETECTOR_PERF and the function is defined in that
file if CONFIG_HARDLOCKUP_CHECK_TIMESTAMP.

The dummy version of the function in "nmi.h" didn't get that quite
right. While this doesn't appear to be a huge deal, it's nice to make
it consistent.

It doesn't break builds because CHECK_TIMESTAMP is only defined by
x86 so others don't get a double definition, and x86 uses perf lockup
detector, so it gets the out of line version.

Fixes: 7edaeb6841df ("kernel/watchdog: Prevent false positives with turbo modes")
Reviewed-by: Nicholas Piggin <npiggin@...il.com>
Reviewed-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v5:
- Add Nicholas's explanation of why this didn't break builds.
- watchdog_hardlockup_perf.c => kernel/watchdog_hld.c in description.

Changes in v4:
- ("Define dummy watchdog_update_hrtimer_threshold() ...") new for v4.

 include/linux/nmi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index 048c0b9aa623..771d77b62bc1 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -197,7 +197,7 @@ u64 hw_nmi_get_sample_period(int watchdog_thresh);
 #endif
 
 #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \
-    defined(CONFIG_HARDLOCKUP_DETECTOR)
+    defined(CONFIG_HARDLOCKUP_DETECTOR_PERF)
 void watchdog_update_hrtimer_threshold(u64 period);
 #else
 static inline void watchdog_update_hrtimer_threshold(u64 period) { }
-- 
2.40.1.698.g37aff9b760-goog