From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Pavel Tatashin <pasha.tatashin@oracle.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Zhou Chengming <zhouchengming1@huawei.com>,
Jiri Kosina <jkosina@suse.cz>,
Josh Poimboeuf <jpoimboe@redhat.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Chris von Recklinghausen <crecklin@redhat.com>,
Jason Baron <jbaron@akamai.com>, Scott Wood <swood@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Clark Williams <williams@redhat.com>,
x86@kernel.org
Subject: Re: [PATCH V2 9/9] jump_label: Batch up if arch supports it
Date: Tue, 18 Dec 2018 22:06:06 +0100 [thread overview]
Message-ID: <9bc42806-e48f-a9a0-980a-3f0c83dd3d3a@redhat.com> (raw)
In-Reply-To: <20181218153208.6f8bd858@gandalf.local.home>
On 12/18/18 9:32 PM, Steven Rostedt wrote:
> Where? Mostly we have BUILD_BUG_ON() which isn't bad at all.
>
> The only other BUG I see in the jump label code is in the arch specific
> code and that's from 2012. Lately, we are trying to get rid of BUG()
> and panic() entirely, with a few exceptions (where there's really no
> way to return. Like when the function graph stack is corrupted, and we
> don't know where to go).
>
> If there's a way to continue in a critical state, it's best to WARN()
> and continue on. That way, the user can have a chance to see what
> happened.
Got it!
>> What I could do here is:
>>
>> Add a "fallback" boll that is disabled by default.
>> If I hit this case:
>> WARN()
>> turn "fallback" on, returning to the old mode (without batch)
>>
>> Sound better?
> Yes, please do.
ack!
Thanks, Steve!
-- Daniel
prev parent reply other threads:[~2018-12-18 21:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 16:46 [PATCH V2 0/9] x86/jump_label: Bound IPIs sent when updating a static key Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 1/9] jump_label: Add for_each_label_entry helper Daniel Bristot de Oliveira
2018-12-18 21:19 ` Borislav Petkov
2018-12-19 7:38 ` Daniel Bristot de Oliveira
2018-12-19 10:37 ` Borislav Petkov
2018-12-18 16:46 ` [PATCH V2 2/9] jump_label: Add the jump_label_can_update_check() helper Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 3/9] x86/jump_label: Move checking code away from __jump_label_transform() Daniel Bristot de Oliveira
2018-12-19 8:43 ` Jiri Kosina
2018-12-19 8:49 ` Thomas Gleixner
2018-12-19 10:14 ` Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 4/9] x86/jump_label: Add __jump_label_set_jump_code() helper Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 5/9] x86/alternative: Split text_poke_bp() into tree steps Daniel Bristot de Oliveira
2018-12-18 17:25 ` Steven Rostedt
2018-12-19 8:44 ` Jiri Kosina
2018-12-18 16:46 ` [PATCH V2 6/9] jump_label: Sort entries of the same key by the code Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 7/9] x86/alternative: Batch of patch operations Daniel Bristot de Oliveira
2018-12-18 17:31 ` Steven Rostedt
2018-12-18 19:27 ` Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 8/9] x86/jump_label: Batch jump label updates Daniel Bristot de Oliveira
2018-12-18 16:46 ` [PATCH V2 9/9] jump_label: Batch up if arch supports it Daniel Bristot de Oliveira
2018-12-18 17:35 ` Steven Rostedt
2018-12-18 19:33 ` Daniel Bristot de Oliveira
2018-12-18 20:32 ` Steven Rostedt
2018-12-18 21:06 ` Daniel Bristot de Oliveira [this message]
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