linux-kernel - Re: [PATCH v4 01/13] kexec: consolidate kexec and crash options into kernel/Kconfig.kexec

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Message-ID: <5dc44667-2421-f926-babd-e2f5c86b8e57@oracle.com>
Date:   Thu, 6 Jul 2023 07:23:15 -0500
From:   Eric DeVolder <eric.devolder@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org
Cc:     WANG Xuerui <kernel@...0n.name>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>, gor@...ux.ibm.com,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        borntraeger@...ux.ibm.com, Sven Schnelle <svens@...ux.ibm.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kees Cook <keescook@...omium.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Zi Yan <ziy@...dia.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Xin Li <xin3.li@...el.com>, Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        tsi@...oix.net, Baoquan He <bhe@...hat.com>,
        hbathini@...ux.ibm.com, sourabhjain@...ux.ibm.com,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v4 01/13] kexec: consolidate kexec and crash options into
 kernel/Kconfig.kexec



On 7/6/23 07:18, Arnd Bergmann wrote:
> On Wed, Jul 5, 2023, at 16:19, Eric DeVolder wrote:
>> +
>> +config CRASH_DUMP
>> +	bool "kernel crash dumps"
>> +	depends on ARCH_SUPPORTS_CRASH_DUMP
>> +	select CRASH_CORE
>> +	select KEXEC
> 
> Today's linux-next now runs into a warning on arm64 and
> presumably others, with the same problem as on arm earlier:
> 
> WARNING: unmet direct dependencies detected for KEXEC
>    Depends on [n]: ARCH_SUPPORTS_KEXEC [=n]
>    Selected by [y]:
>    - CRASH_DUMP [=y] && ARCH_SUPPORTS_CRASH_DUMP [=y]
> 
> I think the easiest way to make this reliable would be
> this fixup:
> 
> diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
> index d82a7ce59c051..e58ca6128d6ee 100644
> --- a/kernel/Kconfig.kexec
> +++ b/kernel/Kconfig.kexec
> @@ -91,6 +91,7 @@ config KEXEC_JUMP
>   config CRASH_DUMP
>          bool "kernel crash dumps"
>          depends on ARCH_SUPPORTS_CRASH_DUMP
> +       depends on ARCH_SUPPORTS_KEXEC
>          select CRASH_CORE
>          select KEXEC
>          help
> 
>     Arnd

Will do, thanks!
I changed my testing to include allnoconfig and allyesconfig and that revealed some minor issues as 
well. Almost there!
eric