watchdog/hardlockup: define HARDLOCKUP_DETECTOR_ARCH

The HAVE_ prefix means that the code could be enabled. Add another
variable for HAVE_HARDLOCKUP_DETECTOR_ARCH without this prefix.
It will be set when it should be built. It will make it compatible
with the other hardlockup detectors.

The change allows to clean up dependencies of PPC_WATCHDOG
and HAVE_HARDLOCKUP_DETECTOR_PERF definitions for powerpc.

As a result HAVE_HARDLOCKUP_DETECTOR_PERF has the same dependencies
on arm, x86, powerpc architectures.

Link: https://lkml.kernel.org/r/20230616150618.6073-7-pmladek@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: pmladek

arch/powerpc/Kconfig

@@ -90,8 +90,7 @@ config NMI_IPI
 
 config PPC_WATCHDOG
 	bool
-	depends on HARDLOCKUP_DETECTOR
-	depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
+	depends on HARDLOCKUP_DETECTOR_ARCH
 	default y
 	help
 	  This is a placeholder when the powerpc hardlockup detector
@@ -240,7 +239,7 @@ config PPC
 	select HAVE_GCC_PLUGINS			if GCC_VERSION >= 50200   # plugin support on gcc <= 5.1 is buggy on PPC
 	select HAVE_GENERIC_VDSO
 	select HAVE_HARDLOCKUP_DETECTOR_ARCH	if PPC_BOOK3S_64 && SMP
-	select HAVE_HARDLOCKUP_DETECTOR_PERF	if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
+	select HAVE_HARDLOCKUP_DETECTOR_PERF	if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
 	select HAVE_HW_BREAKPOINT		if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
 	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_TIME_ACCOUNTING

include/linux/nmi.h

@@ -9,7 +9,7 @@
 #include <asm/irq.h>
 
 /* Arch specific watchdogs might need to share extra watchdog-related APIs. */
-#if defined(CONFIG_HAVE_HARDLOCKUP_DETECTOR_ARCH) || defined(CONFIG_HARDLOCKUP_DETECTOR_SPARC64)
+#if defined(CONFIG_HARDLOCKUP_DETECTOR_ARCH) || defined(CONFIG_HARDLOCKUP_DETECTOR_SPARC64)
 #include <asm/nmi.h>
 #endif
 

lib/Kconfig.debug

@@ -1056,6 +1056,7 @@ config HARDLOCKUP_DETECTOR
 	depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_BUDDY || HAVE_HARDLOCKUP_DETECTOR_ARCH
 	imply HARDLOCKUP_DETECTOR_PERF
 	imply HARDLOCKUP_DETECTOR_BUDDY
+	imply HARDLOCKUP_DETECTOR_ARCH
 	select LOCKUP_DETECTOR
 
 	help
@@ -1101,6 +1102,14 @@ config HARDLOCKUP_DETECTOR_BUDDY
 	depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
 	select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
 
+config HARDLOCKUP_DETECTOR_ARCH
+	bool
+	depends on HARDLOCKUP_DETECTOR
+	depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
+	help
+	  The arch-specific implementation of the hardlockup detector will
+	  be used.
+
 #
 # Both the "perf" and "buddy" hardlockup detectors count hrtimer
 # interrupts. This config enables functions managing this common code.