linux-kernel - Re: [PATCHV2 1/3] x86, ras: Add new infrastructure for machine check fixup tables

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Message-ID: <CALCETrUO+g9HbPa8yaA=1JpVxw9ReSvgokT_GDKwePigyGoZLQ@mail.gmail.com>
Date:	Fri, 11 Dec 2015 12:06:42 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Tony Luck <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>,
	Dan Williams <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCHV2 1/3] x86, ras: Add new infrastructure for machine check
 fixup tables

On Thu, Dec 10, 2015 at 1:58 PM, Tony Luck <tony.luck@...el.com> wrote:
> Copy the existing page fault fixup mechanisms to create a new table
> to be used when fixing machine checks. Note:
> 1) At this time we only provide a macro to annotate assembly code
> 2) We assume all fixups will in code builtin to the kernel.
> 3) Only for x86_64
> 4) New code under CONFIG_MCE_KERNEL_RECOVERY
>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

> +#ifdef CONFIG_MCE_KERNEL_RECOVERY
> +int fixup_mcexception(struct pt_regs *regs, u64 addr)
> +{
> +       const struct exception_table_entry *fixup;
> +       unsigned long new_ip;
> +
> +       fixup = search_mcexception_tables(regs->ip);
> +       if (fixup) {
> +               new_ip = ex_fixup_addr(fixup);
> +
> +               regs->ip = new_ip;
> +               regs->ax = BIT(63) | addr;

Can this be an actual #define?

--Andy
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