linux-kernel - Re: [PATCH v7 3/3] x86, mce: Add __mcsafe

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Message-ID: <CAPcyv4iijhdXnD-4PuHkzbhhPra8eCRZ=df3XTE=z-efbQmVww@mail.gmail.com>
Date:	Tue, 5 Jan 2016 23:11:10 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	"Elliott, Robert (Persistent Memory)" <elliott@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH v7 3/3] x86, mce: Add __mcsafe_copy()

On Tue, Jan 5, 2016 at 11:06 PM, Luck, Tony <tony.luck@...el.com> wrote:
> You were heading towards:
>
> ld: undefined __mcsafe_copy

True, we'd also need a dummy mcsafe_copy() definition to compile it
out in the disabled case.

> since that is also inside the #ifdef.
>
> Weren't you going to "select" this?
>

I do select it, but by randconfig I still need to handle the
CONFIG_X86_MCE=n case.

> I'm seriously wondering whether the ifdef still makes sense. Now I don't have an extra exception table and routines to sort/search/fixup, it doesn't seem as useful as it was a few iterations ago.

Either way is ok with me.  That said, the extra definitions to allow
it compile out when not enabled don't seem too onerous.
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