linux-kernel - [PATCH v2] powerpc: Fix HAVE_HARDLOCKUP_DETECTOR

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Date:   Mon, 29 Mar 2021 10:27:00 +0800
From:   Chen Huang <chenhuang5@...wei.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Paul Mackerras" <paulus@...ba.org>
CC:     Don Zickus <dzickus@...hat.com>, <linux-kernel@...r.kernel.org>,
        "Nicholas Piggin" <npiggin@...il.com>,
        Hulk Robot <hulkci@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linuxppc-dev@...ts.ozlabs.org>
Subject: [PATCH v2] powerpc: Fix HAVE_HARDLOCKUP_DETECTOR_ARCH build
 configuration

When compiling the powerpc with the SMP disabled, it shows the issue:

arch/powerpc/kernel/watchdog.c: In function ‘watchdog_smp_panic’:
arch/powerpc/kernel/watchdog.c:177:4: error: implicit declaration of function ‘smp_send_nmi_ipi’; did you mean ‘smp_send_stop’? [-Werror=implicit-function-declaration]
  177 |    smp_send_nmi_ipi(c, wd_lockup_ipi, 1000000);
      |    ^~~~~~~~~~~~~~~~
      |    smp_send_stop
cc1: all warnings being treated as errors
make[2]: *** [scripts/Makefile.build:273: arch/powerpc/kernel/watchdog.o] Error 1
make[1]: *** [scripts/Makefile.build:534: arch/powerpc/kernel] Error 2
make: *** [Makefile:1980: arch/powerpc] Error 2
make: *** Waiting for unfinished jobs....

We found that powerpc used ipi to implement hardlockup watchdog, so the
HAVE_HARDLOCKUP_DETECTOR_ARCH should depend on the SMP.

Fixes: 2104180a5369 ("powerpc/64s: implement arch-specific hardlockup watchdog")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Chen Huang <chenhuang5@...wei.com>
---
 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 764df010baee..a5196e1a1281 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -210,6 +210,7 @@ config PPC
    select HAVE_FUNCTION_TRACER
    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_HW_BREAKPOINT       if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
    select HAVE_IDE
    select HAVE_IOREMAP_PROT
@@ -225,7 +226,6 @@ config PPC
    select HAVE_LIVEPATCH           if HAVE_DYNAMIC_FTRACE_WITH_REGS
    select HAVE_MOD_ARCH_SPECIFIC
    select HAVE_NMI             if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
-   select HAVE_HARDLOCKUP_DETECTOR_ARCH    if (PPC64 && PPC_BOOK3S)
    select HAVE_OPTPROBES           if PPC64
    select HAVE_PERF_EVENTS
    select HAVE_PERF_EVENTS_NMI     if PPC64
--
2.17.1