linux-kernel - Re: [PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code

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Date:   Fri, 04 May 2018 15:16:37 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nicholas Piggin <npiggin@...il.com>, linuxppc-dev@...ts.ozlabs.org
Cc:     Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
        Nicholas Piggin <npiggin@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 04/15] powerpc/powernv: opal-kmsg use flush fallback from console code

Nicholas Piggin <npiggin@...il.com> writes:

> Use the more refined and tested event polling loop from opal_put_chars
> as the fallback console flush in the opal-kmsg path. This loop is used
> by the console driver today, whereas the opal-kmsg fallback is not
> likely to have been used for years.
>
> Use WARN_ONCE rather than a printk when the fallback is invoked to
> prepare for moving the console flush into a common function.

Do we want to add a WARN in that path? If we're panicking things might
get worse if we WARN (which takes a trap).

cheers