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

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Date:   Thu, 06 Jul 2023 14:18:36 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Eric DeVolder" <eric.devolder@...cle.com>,
        "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 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