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From: Peter Zijlstra <peterz@infradead.org>
To: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Linux-Kernel <linux-kernel@vger.kernel.org>,
	mingo@redhat.com, luto@kernel.org, konrad.wilk@oracle.com,
	dwmw@amazon.co.uk, tglx@linutronix.de,
	Srinivas REDDY Eeda <srinivas.eeda@oracle.com>,
	bp@suse.de, daniel@iogearbox.net, yamada.masahiro@socionext.com,
	michal.lkml@markovi.net, hpa@zytor.com
Subject: Re: [PATCH 1/3] retpolines: Only enable retpoline when compiler support it
Date: Tue, 30 Oct 2018 09:32:10 +0100	[thread overview]
Message-ID: <20181030083210.GA1459@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <e63900bc-d7af-4a57-aa96-f6cc84b89e09@default>

On Mon, Oct 29, 2018 at 11:55:04PM -0700, Zhenzhong Duan wrote:
> Since retpoline capable compilers are widely available, make
> CONFIG_RETPOLINE hard depend on it.
> 
> Change KBUILD to use CONFIG_RETPOLINE_SUPPORT to avoid conflict with
> CONFIG_RETPOLINE which is used by kernel.
> 
> With all that stuff, the check of RETPOLINE is changed to
> CONFIG_RETPOLINE.

So what happens when we select CONFIG_RETPOLINE but do not have
RETPOLINE_SUPPORT ? From a quick reading we'll silently build a
!retpoline kernel. I would expect a build failure.

  reply	other threads:[~2018-10-30 15:29 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-30  6:55 Zhenzhong Duan
2018-10-30  8:32 ` Peter Zijlstra [this message]
2018-10-31  4:58   ` Zhenzhong Duan
2018-10-30  9:39 ` Masahiro Yamada
2018-10-30 10:09   ` Peter Zijlstra
2018-10-31  5:55     ` Zhenzhong Duan

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