linux-kernel - Re: [PATCH 2/9] iommu/ipmmu-vmsa: Hook up R8A774E1 DT matching code

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Date:   Tue, 14 Jul 2020 14:39:39 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Joerg Roedel <joro@...tes.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        dmaengine <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] iommu/ipmmu-vmsa: Hook up R8A774E1 DT matching code

Hi Shimoda-san,

On Tue, Jul 14, 2020 at 1:42 PM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@...esas.com> wrote:
> > From: Geert Uytterhoeven, Sent: Tuesday, July 14, 2020 5:42 PM
> > On Tue, Jul 14, 2020 at 10:30 AM Lad, Prabhakar
> > <prabhakar.csengg@...il.com> wrote:
> > > On Tue, Jul 14, 2020 at 9:09 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > On Mon, Jul 13, 2020 at 11:35 PM Lad Prabhakar
> > > Also the recent patch to add
> > > "r8a77961" just adds to soc_rcar_gen3_whitelist.
> >
> > Oops, commit 17fe16181639801b ("iommu/renesas: Add support for r8a77961")
> > did it wrong, too.
>
> Thank you for the point it out. We should add r8a77961 to the soc_rcar_gen3[].
> However, I don't know why I could not realize this issue...
> So, I investigated this a little and then, IIUC, glob_match() which
> soc_device_match() uses seems to return true, if *pat = "r8a7796" and *str = "r8a77961".

Are you sure about this?
I enabled CONFIG_GLOB_SELFTEST, and globtest succeeded.
It does test glob_match("a", "aa"), which is a similar test.

To be 100% sure, I added:

--- a/lib/globtest.c
+++ b/lib/globtest.c
@@ -59,6 +59,7 @@ static char const glob_tests[] __initconst =
        "1" "a\0" "a\0"
        "0" "a\0" "b\0"
        "0" "a\0" "aa\0"
+       "0" "r8a7796\0" "r8a77961\0"
        "0" "a\0" "\0"
        "1" "\0" "\0"
        "0" "\0" "a\0"

and it still succeeded.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds