linux-kernel - Re: [PATCH 6/8] x86/platform/uv: Decode UVsystab Info

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Message-ID: <20190905141634.GA25790@kroah.com>
Date:   Thu, 5 Sep 2019 16:16:34 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mike Travis <mike.travis@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@...radead.org>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        Hedi Berriche <hedi.berriche@....com>,
        Steve Wahl <steve.wahl@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 6/8] x86/platform/uv: Decode UVsystab Info

On Thu, Sep 05, 2019 at 08:02:58AM -0500, Mike Travis wrote:
> Decode the hubless UVsystab passed from BIOS to the kernel saving
> pertinent info in a similar manner that hubbed UVsystabs are decoded.
> 
> Signed-off-by: Mike Travis <mike.travis@....com>
> Reviewed-by: Steve Wahl <steve.wahl@....com>
> Reviewed-by: Dimitri Sivanich <dimitri.sivanich@....com>
> To: Thomas Gleixner <tglx@...utronix.de>
> To: Ingo Molnar <mingo@...hat.com>
> To: H. Peter Anvin <hpa@...or.com>
> To: Andrew Morton <akpm@...ux-foundation.org>
> To: Borislav Petkov <bp@...en8.de>
> To: Christoph Hellwig <hch@...radead.org>
> Cc: Dimitri Sivanich <dimitri.sivanich@....com>
> Cc: Russ Anderson <russ.anderson@....com>
> Cc: Hedi Berriche <hedi.berriche@....com>
> Cc: Steve Wahl <steve.wahl@....com>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: stable@...r.kernel.org
> ---
>  arch/x86/kernel/apic/x2apic_uv_x.c |   16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)

If you are trying to get one of my automated "WTF: patch XXXX was
seriously submitted to be applied to the stable tree?" emails, you are
on track for it...

Please go read the documentation link I sent you last time and figure
out how you can justify any of this patch series for a stable kernel
tree.

Also, nit:

> --- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
> +++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
> @@ -1303,7 +1303,8 @@ static int __init decode_uv_systab(void)
>  	struct uv_systab *st;
>  	int i;
>  
> -	if (uv_hub_info->hub_revision < UV4_HUB_REVISION_BASE)
> +	/* Select only UV4 (hubbed or hubless) and higher */
> +	if (is_uv_hubbed(-2) < uv(4) && is_uv_hubless(-2) < uv(4))
>  		return 0;	/* No extended UVsystab required */
>  
>  	st = uv_systab;
> @@ -1554,8 +1555,19 @@ static __init int uv_system_init_hubless
>  
>  	/* Init kernel/BIOS interface */
>  	rc = uv_bios_init();
> +	if (rc < 0) {
> +		pr_err("UV: BIOS init error:%d\n", rc);

Why isn't that function printing an error?


> +		return rc;
> +	}
> +
> +	/* Process UVsystab */
> +	rc = decode_uv_systab();
> +	if (rc < 0) {
> +		pr_err("UV: UVsystab decode error:%d\n", rc);

Same here, have the function itself print the error, makes this type of
stuff much cleaner.

greg k-h