linux-kernel - Re: [PATCH] livepatch: Remove reliable stacktrace check in klp_try_switch

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Message-Id: <dbd9bdf6-7cb1-cde1-5f7d-d3a5449c560d@linux.vnet.ibm.com>
Date:   Sun, 15 Jul 2018 13:05:56 +0530
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Miroslav Benes <mbenes@...e.cz>, Jiri Kosina <jkosina@...e.cz>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] livepatch: Remove reliable stacktrace check in
 klp_try_switch_task()

On Saturday 14 July 2018 12:07 AM, Josh Poimboeuf wrote:
>> We bail out during patch registration for architectures, those don't
>> support reliable stack trace.
> 
> Does anybody know if that change was intentional?  I thought the plan
> was to allow non-consistency-model arches to still use livepatch, and
> that they'd just have to 'force' patches to completion instead.  That
> seems a little more forgiving.
> 

The initial proposal was to allow 'force' feature on architectures
without HAVE_RELIABLE_STACKTRACE support and use pr_notice() to warn
user about the non-availability of consistency model. It was argued
against, as it will encourage people to use it as an alternative instead
of adding HAVE_RELIABLE_STACKTRACE support to the kernel.

-- 
cheers,
Kamalesh.