linux-kernel - Re: [PATCH v8 3/3] x86, mce: Add __mcsafe

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Message-ID: <20160112002645.GA10179@agluck-desk.sc.intel.com>
Date:	Mon, 11 Jan 2016 16:26:45 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-nvdimm <linux-nvdimm@...1.01.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert <elliott@....com>, Ingo Molnar <mingo@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH v8 3/3] x86, mce: Add __mcsafe_copy()

On Fri, Jan 08, 2016 at 05:49:30PM -0800, Andy Lutomirski wrote:
> Also, what's the sfence for?  You don't seem to be using any
> non-temporal operations.

So I deleted the "sfence" and now I just have a comment
at the 100: label.

37:
        shl $6,%ecx
        lea -48(%ecx,%edx),%edx
        jmp 100f
38:
        shl $6,%ecx
        lea -56(%ecx,%edx),%edx
        jmp 100f
39:
        lea (%rdx,%rcx,8),%rdx
        jmp 100f
40:
        mov %ecx,%edx
100:
        /* %rax set the fault number in fixup_exception() */
        ret

Should I just change all the "jmp 100f" into "ret"?  There
aren't any tools that will be confused that the function
has 10 returns, are there?

-Tony