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Date: Wed, 12 Jun 2019 11:00:08 -0600
From: Rob Herring <robh@...nel.org>
To: Frank Rowand <frowand.list@...il.com>
Cc: Kefeng Wang <wangkefeng.wang@...wei.com>,
devicetree@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH next] of/fdt: Fix defined but not used compiler warning
On Wed, Jun 12, 2019 at 10:45 AM Frank Rowand <frowand.list@...il.com> wrote:
>
> Hi Kefeng,
>
> If Rob agrees, I'd like to see one more change in this patch.
>
> Since the only caller of of_fdt_match() is of_flat_dt_match(),
> can you move the body of of_fdt_match() into of_flat_dt_match()
> and eliminate of_fdt_match()?
That's fine as long as we think there's never any use for of_fdt_match
after init? Fixup of nodes in an overlay for example.
Rob
>
> (Noting that of_flat_dt_match() consists only of the call to
> of_fdt_match().)
>
> -Frank
>
>
> On 6/11/19 6:00 PM, Kefeng Wang wrote:
> > When CONFIG_OF_EARLY_FLATTREE is disabled, there is a compiler warning,
> >
> > drivers/of/fdt.c:129:19: warning: ‘of_fdt_match’ defined but not used [-Wunused-function]
> > static int __init of_fdt_match(const void *blob, unsigned long node,
> >
> > Move of_fdt_match() and of_fdt_is_compatible() under CONFIG_OF_EARLY_FLATTREE
> > to fix it.
> >
> > Cc: Stephen Boyd <swboyd@...omium.org>
> > Cc: Rob Herring <robh@...nel.org>
> > Cc: Frank Rowand <frowand.list@...il.com>
> > Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> > ---
> > drivers/of/fdt.c | 106 +++++++++++++++++++++++------------------------
> > 1 file changed, 53 insertions(+), 53 deletions(-)
> >
> > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> > index 3d36b5afd9bd..d6afd5b22940 100644
> > --- a/drivers/of/fdt.c
> > +++ b/drivers/of/fdt.c
> > @@ -78,38 +78,6 @@ void __init of_fdt_limit_memory(int limit)
> > }
> > }
> >
> > -/**
> > - * of_fdt_is_compatible - Return true if given node from the given blob has
> > - * compat in its compatible list
> > - * @blob: A device tree blob
> > - * @node: node to test
> > - * @compat: compatible string to compare with compatible list.
> > - *
> > - * On match, returns a non-zero value with smaller values returned for more
> > - * specific compatible values.
> > - */
> > -static int of_fdt_is_compatible(const void *blob,
> > - unsigned long node, const char *compat)
> > -{
> > - const char *cp;
> > - int cplen;
> > - unsigned long l, score = 0;
> > -
> > - cp = fdt_getprop(blob, node, "compatible", &cplen);
> > - if (cp == NULL)
> > - return 0;
> > - while (cplen > 0) {
> > - score++;
> > - if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
> > - return score;
> > - l = strlen(cp) + 1;
> > - cp += l;
> > - cplen -= l;
> > - }
> > -
> > - return 0;
> > -}
> > -
> > static bool of_fdt_device_is_available(const void *blob, unsigned long node)
> > {
> > const char *status = fdt_getprop(blob, node, "status", NULL);
> > @@ -123,27 +91,6 @@ static bool of_fdt_device_is_available(const void *blob, unsigned long node)
> > return false;
> > }
> >
> > -/**
> > - * of_fdt_match - Return true if node matches a list of compatible values
> > - */
> > -static int __init of_fdt_match(const void *blob, unsigned long node,> - const char *const *compat)
> > -{
> > - unsigned int tmp, score = 0;
> > -
> > - if (!compat)
> > - return 0;
> > -
> > - while (*compat) {
> > - tmp = of_fdt_is_compatible(blob, node, *compat);
> > - if (tmp && (score == 0 || (tmp < score)))
> > - score = tmp;
> > - compat++;
> > - }
> > -
> > - return score;
> > -}
> > -
> > static void *unflatten_dt_alloc(void **mem, unsigned long size,
> > unsigned long align)
> > {
> > @@ -764,6 +711,59 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
> > return fdt_getprop(initial_boot_params, node, name, size);
> > }
> >
> > +/**
> > + * of_fdt_is_compatible - Return true if given node from the given blob has
> > + * compat in its compatible list
> > + * @blob: A device tree blob
> > + * @node: node to test
> > + * @compat: compatible string to compare with compatible list.
> > + *
> > + * On match, returns a non-zero value with smaller values returned for more
> > + * specific compatible values.
> > + */
> > +static int of_fdt_is_compatible(const void *blob,
> > + unsigned long node, const char *compat)
> > +{
> > + const char *cp;
> > + int cplen;
> > + unsigned long l, score = 0;
> > +
> > + cp = fdt_getprop(blob, node, "compatible", &cplen);
> > + if (cp == NULL)
> > + return 0;
> > + while (cplen > 0) {
> > + score++;
> > + if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
> > + return score;
> > + l = strlen(cp) + 1;
> > + cp += l;
> > + cplen -= l;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * of_fdt_match - Return true if node matches a list of compatible values
> > + */
> > +static int __init of_fdt_match(const void *blob, unsigned long node,
> > + const char *const *compat)
> > +{
> > + unsigned int tmp, score = 0;
> > +
> > + if (!compat)
> > + return 0;
> > +
> > + while (*compat) {
> > + tmp = of_fdt_is_compatible(blob, node, *compat);
> > + if (tmp && (score == 0 || (tmp < score)))
> > + score = tmp;
> > + compat++;
> > + }
> > +
> > + return score;
> > +}
> > +
> > /**
> > * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
> > * @node: node to test
> >
>
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