linux-kernel - Re: [PATCH 3/3] livepatch: Use static buffer for debugging messages under rq lock

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Date:   Thu, 6 Jun 2019 15:27:43 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] livepatch: Use static buffer for debugging messages
 under rq lock

On Fri 2019-05-31 14:39:08, Josh Poimboeuf wrote:
> On Fri, May 31, 2019 at 09:41:47AM +0200, Petr Mladek wrote:
> > The err_buf array uses 128 bytes of stack space.  Move it off the stack
> > by making it static.  It's safe to use a shared buffer because
> > klp_try_switch_task() is called under klp_mutex.
> > 
> > Signed-off-by: Petr Mladek <pmladek@...e.com>
> > Acked-by: Miroslav Benes <mbenes@...e.cz>
> > Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
> 
> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

The patch is committed into for-5.3/core branch.

Note that the branch is based on the last merge from livepatch.git.
As a result, the sefttest fails because of the regression in
the reliable stacktrace code.

You might want to base your development on the for-next branch.
Or you chould cherry pick the commit 7eaf51a2e094229b75cc0c31
("[PATCH] stacktrace: Unbreak stack_trace_save_tsk_reliable()").

Best Regards,
Petr

PS: I am leaving the fate of the other two patches into Miroslav's
hands ;-)