linux-kernel - Re: [PATCH 2/5] CMDLINE: drivers: of: ifdef out cmdline section

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Date:   Thu, 4 Mar 2021 16:29:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Daniel Walker <danielwa@...co.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Will Deacon <will@...nel.org>,
        Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>,
        Andrew Morton <akpm@...ux-foundation.org>,
        X86 ML <x86@...nel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Frank Rowand <frowand.list@...il.com>,
        xe-linux-external@...co.com,
        Ruslan Ruslichenko <rruslich@...co.com>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] CMDLINE: drivers: of: ifdef out cmdline section

On Thu, Mar 4, 2021 at 3:24 PM Daniel Walker <danielwa@...co.com> wrote:
>
> On Thu, Mar 04, 2021 at 08:09:52AM +0100, Christophe Leroy wrote:
> >
> >
> > Le 04/03/2021 à 05:47, Daniel Walker a écrit :
> > > It looks like there's some seepage of cmdline stuff into
> > > the generic device tree code. This conflicts with the
> > > generic cmdline implementation so I remove it in the case
> > > when that's enabled.
> > >
> > > Cc: xe-linux-external@...co.com
> > > Signed-off-by: Ruslan Ruslichenko <rruslich@...co.com>
> > > Signed-off-by: Daniel Walker <danielwa@...co.com>
> > > ---
> > >   drivers/of/fdt.c | 12 ++++++++++++
> > >   1 file changed, 12 insertions(+)
> > >
> > > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> > > index feb0f2d67fc5..cfe4f8d3c9f5 100644
> > > --- a/drivers/of/fdt.c
> > > +++ b/drivers/of/fdt.c
> > > @@ -25,6 +25,7 @@
> > >   #include <linux/serial_core.h>
> > >   #include <linux/sysfs.h>
> > >   #include <linux/random.h>
> > > +#include <linux/cmdline.h>
> > >   #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
> > >   #include <asm/page.h>
> > > @@ -1048,8 +1049,18 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> > >     early_init_dt_check_for_initrd(node);
> > > +#ifdef CONFIG_GENERIC_CMDLINE
> > >     /* Retrieve command line */
> > >     p = of_get_flat_dt_prop(node, "bootargs", &l);
> > > +
> > > +   /*
> > > +    * The builtin command line will be added here, or it can override
> > > +    * with the DT bootargs.
> > > +    */
> > > +   cmdline_add_builtin(data,
> > > +                       ((p != NULL && l > 0) ? p : NULL), /* This is sanity checking */
> >
> > Can we do more simple ? If p is NULL, p is already NULL, so (l > 0 ? p : NULL) should be enough.
>
>
> I believe Rob gave me this line. Maybe he can comment on it.

It's an obvious improvement and LGTM.