linux-kernel - Re: [PATCH v2 13/13] sh/kexec: refactor for kernel/Kconfig.kexec

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Date:   Mon, 19 Jun 2023 20:21:38 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Eric DeVolder <eric.devolder@...cle.com>, linux@...linux.org.uk,
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Subject: Re: [PATCH v2 13/13] sh/kexec: refactor for kernel/Kconfig.kexec

Hi Eric!

On Mon, 2023-06-19 at 10:58 -0400, Eric DeVolder wrote:
> The kexec and crash kernel options are provided in the common
> kernel/Kconfig.kexec. Utilize the common options and provide
> the ARCH_SUPPORTS_ and ARCH_SELECTS_ entries to recreate the
> equivalent set of KEXEC and CRASH options.
> 
> Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
> ---
>  arch/sh/Kconfig | 46 ++++++++--------------------------------------
>  1 file changed, 8 insertions(+), 38 deletions(-)
> 
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 9652d367fc37..d52e0beed7e9 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -546,44 +546,14 @@ menu "Kernel features"
>  
>  source "kernel/Kconfig.hz"
>  
> -config KEXEC
> -	bool "kexec system call (EXPERIMENTAL)"
> -	depends on MMU
> -	select KEXEC_CORE
> -	help
> -	  kexec is a system call that implements the ability to shutdown your
> -	  current kernel, and to start another kernel.  It is like a reboot
> -	  but it is independent of the system firmware.  And like a reboot
> -	  you can start any kernel with it, not just Linux.
> -
> -	  The name comes from the similarity to the exec system call.
> -
> -	  It is an ongoing process to be certain the hardware in a machine
> -	  is properly shutdown, so do not be surprised if this code does not
> -	  initially work for you.  As of this writing the exact hardware
> -	  interface is strongly in flux, so no good recommendation can be
> -	  made.
> -
> -config CRASH_DUMP
> -	bool "kernel crash dumps (EXPERIMENTAL)"
> -	depends on BROKEN_ON_SMP
> -	help
> -	  Generate crash dump after being started by kexec.
> -	  This should be normally only set in special crash dump kernels
> -	  which are loaded in the main kernel with kexec-tools into
> -	  a specially reserved region and then later executed after
> -	  a crash by kdump/kexec. The crash dump kernel must be compiled
> -	  to a memory address not used by the main kernel using
> -	  PHYSICAL_START.
> -
> -	  For more details see Documentation/admin-guide/kdump/kdump.rst
> -
> -config KEXEC_JUMP
> -	bool "kexec jump (EXPERIMENTAL)"
> -	depends on KEXEC && HIBERNATION
> -	help
> -	  Jump between original kernel and kexeced kernel and invoke
> -	  code via KEXEC
> +config ARCH_SUPPORTS_KEXEC
> +	def_bool MMU
> +
> +config ARCH_SUPPORTS_CRASH_DUMP
> +	def_bool BROKEN_ON_SMP
> +
> +config ARCH_SUPPORTS_KEXEC_JUMP
> +	def_bool y
>  
>  config PHYSICAL_START
>  	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)

Acked-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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