linux-kernel - Re: [PATCH] compiler*.h: Add '__' prefix and suffix to all __attribute_

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Date:   Mon, 28 Oct 2019 09:12:30 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [PATCH] compiler*.h: Add '__' prefix and suffix to all
 __attribute__ #defines

On Sun, Oct 27, 2019 at 3:03 PM Joe Perches <joe@...ches.com> wrote:
>
> To avoid macro name collisions and improve portability use a
> double underscore prefix and suffix on all __attribute__ #defines.
>
> Before this patch, 33 of 56 #defines used a form like:
>
>         '#define __<type> __attribute__((__<attribute_name>__))'
>
> Now all __attribute__ #defines use that form.
>
> Signed-off-by: Joe Perches <joe@...ches.com>

Thanks for the cleanup.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  include/linux/compiler-clang.h |  2 +-
>  include/linux/compiler-gcc.h   | 10 +++++-----
>  include/linux/compiler_types.h | 34 +++++++++++++++++-----------------
>  3 files changed, 23 insertions(+), 23 deletions(-)
>
> diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
> index 333a66..26d655f 100644
> --- a/include/linux/compiler-clang.h
> +++ b/include/linux/compiler-clang.h
> @@ -19,7 +19,7 @@
>  /* emulate gcc's __SANITIZE_ADDRESS__ flag */
>  #define __SANITIZE_ADDRESS__
>  #define __no_sanitize_address \
> -               __attribute__((no_sanitize("address", "hwaddress")))
> +               __attribute__((__no_sanitize__("address", "hwaddress")))
>  #else
>  #define __no_sanitize_address
>  #endif
> diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> index d7ee4c..7a2dee 100644
> --- a/include/linux/compiler-gcc.h
> +++ b/include/linux/compiler-gcc.h
> @@ -76,7 +76,7 @@
>  #define __compiletime_error(message) __attribute__((__error__(message)))
>
>  #if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
> -#define __latent_entropy __attribute__((latent_entropy))
> +#define __latent_entropy __attribute__((__latent_entropy__))
>  #endif
>
>  /*
> @@ -101,8 +101,8 @@
>         } while (0)
>
>  #if defined(RANDSTRUCT_PLUGIN) && !defined(__CHECKER__)
> -#define __randomize_layout __attribute__((randomize_layout))
> -#define __no_randomize_layout __attribute__((no_randomize_layout))
> +#define __randomize_layout __attribute__((__randomize_layout__))
> +#define __no_randomize_layout __attribute__((__no_randomize_layout__))
>  /* This anon struct can add padding, so only enable it under randstruct. */
>  #define randomized_struct_fields_start struct {
>  #define randomized_struct_fields_end   } __randomize_layout;
> @@ -140,7 +140,7 @@
>  #endif
>
>  #if __has_attribute(__no_sanitize_address__)
> -#define __no_sanitize_address __attribute__((no_sanitize_address))
> +#define __no_sanitize_address __attribute__((__no_sanitize_address__))
>  #else
>  #define __no_sanitize_address
>  #endif
> @@ -171,4 +171,4 @@
>  #define __diag_GCC_8(s)
>  #endif
>
> -#define __no_fgcse __attribute__((optimize("-fno-gcse")))
> +#define __no_fgcse __attribute__((__optimize__("-fno-gcse")))
> diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
> index 72393a..b8c2145 100644
> --- a/include/linux/compiler_types.h
> +++ b/include/linux/compiler_types.h
> @@ -5,27 +5,27 @@
>  #ifndef __ASSEMBLY__
>
>  #ifdef __CHECKER__
> -# define __user                __attribute__((noderef, address_space(1)))
> -# define __kernel      __attribute__((address_space(0)))
> -# define __safe                __attribute__((safe))
> -# define __force       __attribute__((force))
> -# define __nocast      __attribute__((nocast))
> -# define __iomem       __attribute__((noderef, address_space(2)))
> -# define __must_hold(x)        __attribute__((context(x,1,1)))
> -# define __acquires(x) __attribute__((context(x,0,1)))
> -# define __releases(x) __attribute__((context(x,1,0)))
> -# define __acquire(x)  __context__(x,1)
> -# define __release(x)  __context__(x,-1)
> +# define __user                __attribute__((__noderef__, __address_space__(1)))
> +# define __kernel      __attribute__((__address_space__(0)))
> +# define __safe                __attribute__((__safe__))
> +# define __force       __attribute__((__force__))
> +# define __nocast      __attribute__((__nocast__))
> +# define __iomem       __attribute__((__noderef__, __address_space__(2)))
> +# define __must_hold(x)        __attribute__((__context__(x, 1, 1)))
> +# define __acquires(x) __attribute__((__context__(x, 0, 1)))
> +# define __releases(x) __attribute__((__context__(x, 1, 0)))
> +# define __acquire(x)  __context__(x, 1)
> +# define __release(x)  __context__(x, -1)
>  # define __cond_lock(x,c)      ((c) ? ({ __acquire(x); 1; }) : 0)
> -# define __percpu      __attribute__((noderef, address_space(3)))
> -# define __rcu         __attribute__((noderef, address_space(4)))
> -# define __private     __attribute__((noderef))
> +# define __percpu      __attribute__((__noderef__, __address_space__(3)))
> +# define __rcu         __attribute__((__noderef__, __address_space__(4)))
> +# define __private     __attribute__((__noderef__))
>  extern void __chk_user_ptr(const volatile void __user *);
>  extern void __chk_io_ptr(const volatile void __iomem *);
>  # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
>  #else /* __CHECKER__ */
>  # ifdef STRUCTLEAK_PLUGIN
> -#  define __user __attribute__((user))
> +#  define __user __attribute__((__user__))
>  # else
>  #  define __user
>  # endif
> @@ -111,9 +111,9 @@ struct ftrace_likely_data {
>  #endif
>
>  #if defined(CC_USING_HOTPATCH)
> -#define notrace                        __attribute__((hotpatch(0, 0)))
> +#define notrace                        __attribute__((__hotpatch__(0, 0)))
>  #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY)
> -#define notrace                        __attribute__((patchable_function_entry(0, 0)))
> +#define notrace                        __attribute__((__patchable_function_entry__(0, 0)))
>  #else
>  #define notrace                        __attribute__((__no_instrument_function__))
>  #endif
>
>
> --
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-- 
Thanks,
~Nick Desaulniers