[v2,1/6] lib/eal: add a common wrapper for restricted pointers
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Commit Message
The 'restrict' keyword is recognized in C99, while type qulifier
'__restrict' compiles ok in C with all language levels. This patch
is to add a wrapper defining '__rte_restrict' with 'restrict' and
'__restrict' to be supported by all compilers.
Signed-off-by: Joyce Kong <joyce.kong@arm.com>
---
lib/librte_eal/include/rte_common.h | 10 ++++++++++
1 file changed, 10 insertions(+)
Comments
On Mon, Jul 6, 2020 at 1:19 PM Joyce Kong <joyce.kong@arm.com> wrote:
>
> The 'restrict' keyword is recognized in C99, while type qulifier
> '__restrict' compiles ok in C with all language levels. This patch
> is to add a wrapper defining '__rte_restrict' with 'restrict' and
> '__restrict' to be supported by all compilers.
>
> Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
> ---
> lib/librte_eal/include/rte_common.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/lib/librte_eal/include/rte_common.h b/lib/librte_eal/include/rte_common.h
> index 0843ce69e..cda32c056 100644
> --- a/lib/librte_eal/include/rte_common.h
> +++ b/lib/librte_eal/include/rte_common.h
> @@ -103,6 +103,16 @@ typedef uint16_t unaligned_uint16_t;
> */
> #define __rte_unused __attribute__((__unused__))
>
> +/**
> + * Define a wrapper for restricted pointers which can be supported
> + * by all compilers.
> + */
> +#if __STDC_VERSION__ >= 199901
> +#define __rte_restrict restrict
> +#else
> +#define __rte_restrict __restrict
> +#endif
> +
> /**
> * definition to mark a variable or function parameter as used so
> * as to avoid a compiler warning
> --
> 2.27.0
>
> -----Original Message-----
> From: Joyce Kong <joyce.kong@arm.com>
> Sent: Monday, July 6, 2020 3:49 PM
> To: maxime.coquelin@redhat.com; jerinj@marvell.com;
> zhihong.wang@intel.com; xiaolong.ye@intel.com; beilei.xing@intel.com;
> jia.guo@intel.com; john.mcnamara@intel.com; matan@mellanox.com;
> shahafs@mellanox.com; viacheslavo@mellanox.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Phil Yang <Phil.Yang@arm.com>;
> Ruifeng Wang <Ruifeng.Wang@arm.com>
> Cc: dev@dpdk.org; nd <nd@arm.com>
> Subject: [PATCH v2 1/6] lib/eal: add a common wrapper for restricted
> pointers
>
> The 'restrict' keyword is recognized in C99, while type qulifier
> '__restrict' compiles ok in C with all language levels. This patch
> is to add a wrapper defining '__rte_restrict' with 'restrict' and
> '__restrict' to be supported by all compilers.
>
> Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> ---
Reviewed-by: Phil Yang <phil.yang@arm.com>
> -----Original Message-----
> From: Joyce Kong <joyce.kong@arm.com>
> Sent: Monday, July 6, 2020 3:49 PM
> To: maxime.coquelin@redhat.com; jerinj@marvell.com;
> zhihong.wang@intel.com; xiaolong.ye@intel.com; beilei.xing@intel.com;
> jia.guo@intel.com; john.mcnamara@intel.com; matan@mellanox.com;
> shahafs@mellanox.com; viacheslavo@mellanox.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Phil Yang <Phil.Yang@arm.com>;
> Ruifeng Wang <Ruifeng.Wang@arm.com>
> Cc: dev@dpdk.org; nd <nd@arm.com>
> Subject: [PATCH v2 1/6] lib/eal: add a common wrapper for restricted
> pointers
>
> The 'restrict' keyword is recognized in C99, while type qulifier '__restrict'
> compiles ok in C with all language levels. This patch is to add a wrapper
> defining '__rte_restrict' with 'restrict' and '__restrict' to be supported by all
> compilers.
>
> Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> ---
> lib/librte_eal/include/rte_common.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/lib/librte_eal/include/rte_common.h
> b/lib/librte_eal/include/rte_common.h
> index 0843ce69e..cda32c056 100644
> --- a/lib/librte_eal/include/rte_common.h
> +++ b/lib/librte_eal/include/rte_common.h
> @@ -103,6 +103,16 @@ typedef uint16_t unaligned_uint16_t;
> */
> #define __rte_unused __attribute__((__unused__))
>
> +/**
> + * Define a wrapper for restricted pointers which can be supported
> + * by all compilers.
> + */
> +#if __STDC_VERSION__ >= 199901
> +#define __rte_restrict restrict
> +#else
> +#define __rte_restrict __restrict
> +#endif
> +
> /**
> * definition to mark a variable or function parameter as used so
> * as to avoid a compiler warning
> --
> 2.27.0
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
On Mon, Jul 6, 2020 at 9:50 AM Joyce Kong <joyce.kong@arm.com> wrote:
>
> The 'restrict' keyword is recognized in C99, while type qulifier
> '__restrict' compiles ok in C with all language levels. This patch
> is to add a wrapper defining '__rte_restrict' with 'restrict' and
> '__restrict' to be supported by all compilers.
>
> Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> ---
> lib/librte_eal/include/rte_common.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/lib/librte_eal/include/rte_common.h b/lib/librte_eal/include/rte_common.h
> index 0843ce69e..cda32c056 100644
> --- a/lib/librte_eal/include/rte_common.h
> +++ b/lib/librte_eal/include/rte_common.h
> @@ -103,6 +103,16 @@ typedef uint16_t unaligned_uint16_t;
> */
> #define __rte_unused __attribute__((__unused__))
>
> +/**
> + * Define a wrapper for restricted pointers which can be supported
> + * by all compilers.
> + */
> +#if __STDC_VERSION__ >= 199901
> +#define __rte_restrict restrict
> +#else
> +#define __rte_restrict __restrict
> +#endif
> +
> /**
> * definition to mark a variable or function parameter as used so
> * as to avoid a compiler warning
> --
> 2.27.0
>
This triggers a build error on Centos 7 as reported by the CI.
I suppose the following would do the trick, though it is untested:
/**
* Define a wrapper for restricted pointers which can be supported
* by all compilers.
*/
#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
#define __rte_restrict __restrict
#else
#define __rte_restrict restrict
#endif
> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Tuesday, July 7, 2020 9:57 PM
> To: Joyce Kong <Joyce.Kong@arm.com>
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>; jerinj@marvell.com;
> Zhihong Wang <zhihong.wang@intel.com>; Xiaolong Ye
> <xiaolong.ye@intel.com>; Beilei Xing <beilei.xing@intel.com>; Jeff Guo
> <jia.guo@intel.com>; Mcnamara, John <john.mcnamara@intel.com>; Matan
> Azrad <matan@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>;
> Viacheslav Ovsiienko <viacheslavo@mellanox.com>; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Phil Yang <Phil.Yang@arm.com>;
> Ruifeng Wang <Ruifeng.Wang@arm.com>; dev <dev@dpdk.org>; nd
> <nd@arm.com>
> Subject: Re: [dpdk-dev] [PATCH v2 1/6] lib/eal: add a common wrapper for
> restricted pointers
>
> On Mon, Jul 6, 2020 at 9:50 AM Joyce Kong <joyce.kong@arm.com> wrote:
> >
> > The 'restrict' keyword is recognized in C99, while type qulifier
> > '__restrict' compiles ok in C with all language levels. This patch is
> > to add a wrapper defining '__rte_restrict' with 'restrict' and
> > '__restrict' to be supported by all compilers.
> >
> > Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> > ---
> > lib/librte_eal/include/rte_common.h | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/lib/librte_eal/include/rte_common.h
> > b/lib/librte_eal/include/rte_common.h
> > index 0843ce69e..cda32c056 100644
> > --- a/lib/librte_eal/include/rte_common.h
> > +++ b/lib/librte_eal/include/rte_common.h
> > @@ -103,6 +103,16 @@ typedef uint16_t unaligned_uint16_t;
> > */
> > #define __rte_unused __attribute__((__unused__))
> >
> > +/**
> > + * Define a wrapper for restricted pointers which can be supported
> > + * by all compilers.
> > + */
> > +#if __STDC_VERSION__ >= 199901
> > +#define __rte_restrict restrict
> > +#else
> > +#define __rte_restrict __restrict
> > +#endif
> > +
> > /**
> > * definition to mark a variable or function parameter as used so
> > * as to avoid a compiler warning
> > --
> > 2.27.0
> >
>
> This triggers a build error on Centos 7 as reported by the CI.
> I suppose the following would do the trick, though it is untested:
>
> /**
> * Define a wrapper for restricted pointers which can be supported
> * by all compilers.
> */
> #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L #define
> __rte_restrict __restrict #else #define __rte_restrict restrict #endif
>
Will add this judgement in next version.
>
> --
> David Marchand
@@ -103,6 +103,16 @@ typedef uint16_t unaligned_uint16_t;
*/
#define __rte_unused __attribute__((__unused__))
+/**
+ * Define a wrapper for restricted pointers which can be supported
+ * by all compilers.
+ */
+#if __STDC_VERSION__ >= 199901
+#define __rte_restrict restrict
+#else
+#define __rte_restrict __restrict
+#endif
+
/**
* definition to mark a variable or function parameter as used so
* as to avoid a compiler warning