linux-kernel - Re: linux-next: Fixes tag needs some work in the tip tree

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Message-ID: <20190829191800.28cd34c2@canb.auug.org.au>
Date:   Thu, 29 Aug 2019 19:18:00 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Bandan Das <bsd@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: Fixes tag needs some work in the tip tree

Hi Bandan,

On Thu, 29 Aug 2019 04:26:33 -0400 Bandan Das <bsd@...hat.com> wrote:
>
> Stephen Rothwell <sfr@...b.auug.org.au> writes:
> 
> > In commit
> >
> >   bae3a8d3308e ("x86/apic: Do not initialize LDR and DFR for bigsmp")
> >
> > Fixes tag
> >
> >   Fixes: db7b9e9f26b8 ("[PATCH] Clustered APIC setup for >8 CPU systems")
> >
> > has these problem(s):
> >
> >   - Target SHA1 does not exist
> >  
> 
> I tried to dig this up and I believe that this is from pre-git.
> I went back as far as commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
> Author: Linus Torvalds <torvalds@...970.osdl.org>
> Date:   Sat Apr 16 15:20:36 2005 -0700
> 
>     Linux-2.6.12-rc2
>     
>     Initial git repository build. I'm not bothering with the full history,
>     even though we have it. We can create a separate "historical" git
>     archive of that later if we want to, and in the meantime it's about
>     3.2GB when imported into git - space that would just make the early
>     git days unnecessarily complicated, when we don't have a lot of good
>     infrastructure for it.
>     
>     Let it rip!
> 
> which adds init_apic_ldr() in include/asm-i386/mach-bigsmp/mach_apic.h with
> the following:
> 
> +static inline void init_apic_ldr(void)
> +{
> +       unsigned long val;
> +
> +       apic_write_around(APIC_DFR, APIC_DFR_VALUE);
> +       val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
> +       val = calculate_ldr(val);
> +       apic_write_around(APIC_LDR, val);
> +}
> ...
> 
> 
> So, the bug seems to be present here as well...

Ah ha!

commit db7b9e9f26b8 ("[PATCH] Clustered APIC setup for >8 CPU systems")
is from Thomas' history git tree ...  I should have read more of the
commit message :-(  Sorry for the noise.

-- 
Cheers,
Stephen Rothwell

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