linux-kernel - Re: [PATCH v3] partitions/efi: Fix partition name parsing in GUID partition entry

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Date:   Fri, 6 Mar 2020 11:14:41 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Nikolai Merinov <n.merinov@...ngo-systems.com>
Cc:     hch <hch@...radead.org>, Davidlohr Bueso <dave@...olabs.net>,
        Jens Axboe <axboe@...nel.dk>,
        linux-efi <linux-efi@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] partitions/efi: Fix partition name parsing in GUID
 partition entry

On Fri, 6 Mar 2020 at 10:25, Ard Biesheuvel <ardb@...nel.org> wrote:
>
> On Fri, 6 Mar 2020 at 09:43, Nikolai Merinov
> <n.merinov@...ngo-systems.com> wrote:
> >
> > Hi Christoph,
> >
> > Should I perform any other steps in order to get this change in the master?
> >
>
> I can take it via the EFI tree with an ack from Dave.
>

... or actually, I'm sure Dave is fine with it, so I'll just queue it
in efi/next directly (with Christoph's ack)

>
> >
> > ----- Original Message -----
> > > From: "hch" <hch@...radead.org>
> > > To: "n merinov" <n.merinov@...ngo-systems.com>
> > > Cc: "hch" <hch@...radead.org>, "Davidlohr Bueso" <dave@...olabs.net>, "Jens Axboe" <axboe@...nel.dk>, "Ard Biesheuvel"
> > > <ardb@...nel.org>, "linux-efi" <linux-efi@...r.kernel.org>, "linux-block" <linux-block@...r.kernel.org>, "linux-kernel"
> > > <linux-kernel@...r.kernel.org>
> > > Sent: Monday, February 24, 2020 10:08:13 PM
> > > Subject: Re: [PATCH v3] partitions/efi: Fix partition name parsing in GUID partition entry
> >
> > > On Mon, Feb 24, 2020 at 01:38:39PM +0200, Nikolai Merinov wrote:
> > >> Hi Christoph,
> > >>
> > >> > I'd rather use plain __le16 and le16_to_cpu here. Also the be
> > >> > variants seems to be entirely unused.
> > >>
> > >> Looks like I misunderstood your comment from
> > >> https://patchwork.kernel.org/patch/11309223/:
> > >>
> > >> > Please add a an efi_char_from_cpu or similarly named helper
> > >> > to encapsulate this logic.
> > >>
> > >> The "le16_to_cpu(ptes[i].partition_name[label_count])" call is the
> > >> full implementation of the "efi_char_from_cpu" logic. Do you want
> > >> to encapsulate "utf16_le_to_7bit_string" logic entirely like in
> > >> the attached version?
> > >
> > > I think I though of just the inner loop, but your new version looks even
> > > better, so:
> > >
> > > Reviewed-by: Christoph Hellwig <hch@....de>