watchdog/perf: rename watchdog_hld.c to watchdog_perf.c

JIRA: https://issues.redhat.com/browse/RHEL-143910

commit 6ea0d04211a7715a926f5dca4aa1065614fa64da
Author: Douglas Anderson <dianders@chromium.org>
Date:   Fri, 19 May 2023 10:18:31 -0700

    watchdog/perf: rename watchdog_hld.c to watchdog_perf.c

    The code currently in "watchdog_hld.c" is for detecting hardlockups using
    perf, as evidenced by the line in the Makefile that only compiles this
    file if CONFIG_HARDLOCKUP_DETECTOR_PERF is defined.  Rename the file to
    prepare for the buddy hardlockup detector, which doesn't use perf.

    It could be argued that the new name makes it less obvious that this is a
    hardlockup detector.  While true, it's not hard to remember that the
    "perf" detector is always a hardlockup detector and it's nice not to have
    names that are too convoluted.

    Link: https://lkml.kernel.org/r/20230519101840.v5.7.Ice803cb078d0e15fb2cbf49132f096ee2bd4199d@changeid
    Signed-off-by: Douglas Anderson <dianders@chromium.org>
    Acked-by: Nicholas Piggin <npiggin@gmail.com>
    Reviewed-by: Petr Mladek <pmladek@suse.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Chen-Yu Tsai <wens@csie.org>
    Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
    Cc: Colin Cross <ccross@android.com>
    Cc: Daniel Thompson <daniel.thompson@linaro.org>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Guenter Roeck <groeck@chromium.org>
    Cc: Ian Rogers <irogers@google.com>
    Cc: Lecopzer Chen <lecopzer.chen@mediatek.com>
    Cc: Marc Zyngier <maz@kernel.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>
    Cc: Matthias Kaehlcke <mka@chromium.org>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Pingfan Liu <kernelfans@gmail.com>
    Cc: Randy Dunlap <rdunlap@infradead.org>
    Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
    Cc: Ricardo Neri <ricardo.neri@intel.com>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Stephen Boyd <swboyd@chromium.org>
    Cc: Sumit Garg <sumit.garg@linaro.org>
    Cc: Tzung-Bi Shih <tzungbi@chromium.org>
    Cc: Will Deacon <will@kernel.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Waiman Long <longman@redhat.com>

kernel/Makefile

@@ -98,7 +98,7 @@ obj-$(CONFIG_FAIL_FUNCTION) += fail_function.o
 obj-$(CONFIG_KGDB) += debug/
 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
 obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
-obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF) += watchdog_hld.o
+obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF) += watchdog_perf.o
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o

kernel/watchdog_perf.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Detect hard lockups on a system
+ * Detect hard lockups on a system using perf
  *
  * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
  *