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 Mon, 19 Oct 2020 10:13:46 -0400 (EDT)
From: Thomas Monjalon <thomas@monjalon.net>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, anatoly.burakov@intel.com, david.marchand@redhat.com
Date: Mon, 19 Oct 2020 16:13:46 +0200
Message-ID: <11702768.X94JZly3y1@thomas>
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Subject: Re: [dpdk-dev] [PATCH v2] eal/rte_malloc: add alloc_size()
	attribute to allocation functions
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15/10/2020 02:55, Stephen Hemminger:
> By using the alloc_size() attribute the compiler can optimize
> better and detect errors at compile time.
> 
> For example, Gcc will fail one of the invalid allocation examples
> in app/test/test_malloc.c because the allocation is outside the
> limits of memory.
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
> v2 - rebase onto correct branch (main)
[...]
> +/**
> + * Tells compiler that the function returns a value that points to
> + * memory, where the size is given by the one or two arguments.
> + * Used by compiler to validate object size.
> + */
> +#if defined(RTE_CC_GCC) || defined(RTE_CC_CLANG)
> +#define __rte_alloc_size(...) \
> +	__attribute__((alloc_size(__VA_ARGS__)))
> +#else
> +#define __rte_alloc_size(...)
> +#endif

Not sure about the rebase: RTE_CC_GCC and RTE_CC_CLANG don't exist.