linux-kernel - Re: [PATCH v3 1/7] dump_stack: Support adding to the dump stack arch description

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Message-ID: <20190208020137.GA22600@jagdpanzerIV>
Date:   Fri, 8 Feb 2019 11:01:37 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...abs.org, akpm@...ux-foundation.org, tj@...nel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        dyoung@...hat.com, sergey.senozhatsky@...il.com, pmladek@...e.com,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v3 1/7] dump_stack: Support adding to the dump stack arch
 description

Cc-ing Steven

  https://lore.kernel.org/lkml/20190207124635.3885-1-mpe@ellerman.id.au/T/#u

On (02/07/19 23:46), Michael Ellerman wrote:
> Arch code can set a "dump stack arch description string" which is
> displayed with oops output to describe the hardware platform.
> 
> It is useful to initialise this as early as possible, so that an early
> oops will have the hardware description.
> 
> However in practice we discover the hardware platform in stages, so it
> would be useful to be able to incrementally fill in the hardware
> description as we discover it.
> 
> This patch adds that ability, by creating dump_stack_add_arch_desc().
> 
> If there is no existing string it behaves exactly like
> dump_stack_set_arch_desc(). However if there is an existing string it
> appends to it, with a leading space.
> 
> This makes it easy to call it multiple times from different parts of the
> code and get a reasonable looking result.
> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

You probably can have a __init buffer somewhere in ppc code, append
data to it, step by step, and call dump_stack_set_arch_desc() all
the time.

But no real objections; dump_stack_add_arch_desc() can do.

FWIW,
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss