linux-kernel - Re: [PATCH v2] efi: Unify dmi setup code over architectures arm/arm64, io64 and x86

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Date:   Thu, 21 Mar 2019 11:11:50 +0100
From:   Jean Delvare <jdelvare@...e.de>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Robert Richter <rrichter@...vell.com>
Cc:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Marcin Benka <mbenka@...vell.com>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2] efi: Unify dmi setup code over architectures
 arm/arm64, io64 and x86

On Thu, 2019-03-21 at 10:51 +0100, Ard Biesheuvel wrote:
> On Thu, 21 Mar 2019 at 10:39, Robert Richter <rrichter@...vell.com> wrote:
> > 
> > On 20.03.19 23:02:09, Ard Biesheuvel wrote:
> > > On Wed, 20 Mar 2019 at 16:23, Robert Richter <rrichter@...vell.com> wrote:
> > > > 
> > > > On 20.03.19 14:16:07, Robert Richter wrote:
> > > > > On 20.03.19 13:05:37, Robert Richter wrote:
> > > > > > @@ -167,6 +167,7 @@ static int __init arm_dmi_init(void)
> > > > > >      * itself, depends on dmi_scan_machine() having been called already.
> > > > > >      */
> > > > > >     dmi_scan_machine();
> > > > > > +   dmi_memdev_walk();
> > > > > >     if (dmi_available)
> > > > > >             dmi_set_dump_stack_arch_desc();
> > > > > >     return 0;
> > > > > 
> > > > > After
> > > > > 
> > > > >  [PATCH] efi/arm: Show SMBIOS bank/device location in cper and
> > > > >   ghes error logs
> > > > > 
> > > > > wents in for arm/arm64, we can unify the code. See patch below.
> > > > 
> > > > V2 with the fix in arm_dmi_init() below.
> > > > 
> > > > -Robert
> > > > 
> > > > 
> > > > -- >8 --
> > > > From: Robert Richter <rrichter@...vell.com>
> > > > Subject: [PATCH v2] efi: Unify dmi setup code over architectures arm/arm64,
> > > >  io64 and x86
> > > > 
> > > > All architectures (arm/arm64, io64 and x86) do the same here, so unify
> > > > the code.
> > > > 
> > > > Note: We do not need to call dump_stack_set_arch_desc() in case of
> > > > !dmi_available. Both strings, dmi_ids_string and dump_stack_arch_
> > > > desc_str are initialized zero and thus nothing would change.
> > > > 
> > > 
> > > I don't understand the last sentence - we do not need to call
> > > dump_stack_set_arch_desc() when !dmi_available, but we do so anyway,
> > > right? Doesn't that wipe the arch description we set based on the DT
> > > machine name?
> > 
> > No, in dmi_setup() we exit early when !dmi_available. So for arm/arm64
> > nothing changed. But for x86 and ia64 we no longer call dump_stack_
> > set_arch_desc() in this case. This is ok since both strings,
> > dmi_ids_string and dump_stack_arch_desc_str, are initialized zero and
> > copying one to the other does not change anything.
> > 
> 
> Ah, of course. Apologies for not reading more carefully.
> 
> I'll take this patch via the EFI tree.

I like the idea. If this is not going through my tree then:

Reviewed-by: Jean Delvare <jdelvare@...e.de>

-- 
Jean Delvare
SUSE L3 Support