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Date: Tue, 8 Mar 2016 12:26:13 +0100
From: Szabolcs Nagy <>
Cc: "Rich Felker (" <>
Subject: Re: RE: [PATCH] MIPS64 atomic_arch.h Clang complains about
 input type

* Jaydeep Patil <> [2016-03-08 10:09:43 +0000]:
> ./arch/mips64/atomic_arch.h:37:29: error: unsupported inline asm: input with type 'long *' matching output with type 'int'

clang probably should not complain about this

(it's possible to have the output in the low 32bit of a 64bit input reg
and then you do want mismatching input/output types for the same reg)

> #define a_sc_p a_sc_p
> -static inline int a_sc_p(volatile long *p, void *v)
> +static inline void *a_sc_p(volatile long *p, void *v)
> {
> -       int r;
> +       void *r;
>         __asm__ __volatile__ (
>                 "scd %0, %1"
>                 : "=r"(r), "=m"(*p) : "0"(v) : "memory");

the return type should be int (1 on success, 0 on failure)

e.g. you can use 'long r' instead of 'int r'

if clang still complains then maybe

	union {void *v; long r;} u = {v};
	__asm__ __volatile__ (
		"scd %0, %1" : "+r"(u.v), "=m"(*p) :: "memory");
	return u.r;

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