linux-kernel - Re: [PATCH 7/8] ACPI, APEI, CPER: Cleanup CPER memory error output format

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Date:	Mon, 14 Oct 2013 23:50:47 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Tony Luck <tony.luck@...il.com>
Cc:	Chen Gong <gong.chen@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Lance Ortiz <lance.ortiz@...com>,
	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Subject: Re: [PATCH 7/8] ACPI, APEI, CPER: Cleanup CPER memory error output
 format

On Mon, Oct 14, 2013 at 02:03:16PM -0700, Tony Luck wrote:
> Do you have a suggested mechanism for this disabling of dmesg?

Hmm, how about a 64-bit flag variable (we can use the remaining bits
for other stuff later) called x86_ras_flags which is private to
arch/x86/ras/core.c (a new file)...

 [ btw, I'm thinking of something similar to efi's x86_efi_facility which we
 nicely query with test_bit and set with set_bit and clear_bit, etc, etc ]

Also, look at arch/x86/platform/efi/efi.c::efi_enabled() how it hides
the actual variable and we can do something similar so that eMCA and
other users like cper.c can do

apei_estatus_print_section:

	if (!ras_tracepoint_enabled())
		cper_print_mem(...)

We set the bit in x86_ras_flags from, say, debugfs, i.e., a userspace
tool sets it and from that moment on all RAS output is rerouted to the
trace event. I.e., the output for which there is a trace event...

How does that look like?

Purely hypothetical, of course, I might me missing something but it
looks ok from here. As always, the devil is in the detail, of course.

HTH.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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