linux-kernel - Re: [PATCH] include/asm/cmpxchg.h: Remove duplicate header

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Date:   Fri, 2 Nov 2018 12:01:18 -0700
From:   Matt Turner <mattst88@...il.com>
To:     jrdr.linux@...il.com
Cc:     Michael Cree <mcree@...on.net.nz>, brajeswar.linux@...il.com,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Andrea Parri <parri.andrea@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        linux-alpha <linux-alpha@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, sabyasachi.linux@...il.com
Subject: Re: [PATCH] include/asm/cmpxchg.h: Remove duplicate header

On Fri, Nov 2, 2018 at 11:55 AM Souptick Joarder <jrdr.linux@...il.com> wrote:
> We run the static analyser "make includecheck" which list out files where
> duplicate headers can be removed and based on that we thought to remove
> from this file. Didn't understood about the existence of second include ??


#define ____xchg(type, args...)         __xchg ## type ## _local(args)
#define ____cmpxchg(type, args...)      __cmpxchg ## type ## _local(args)
#include <asm/xchg.h>
[snip]
#undef ____xchg
#undef ____cmpxchg
#define ____xchg(type, args...)         __xchg ##type(args)
#define ____cmpxchg(type, args...)      __cmpxchg ##type(args)
#include <asm/xchg.h>

asm/xchg.h has a comment at the top that says

/*
 * xchg/xchg_local and cmpxchg/cmpxchg_local share the same code
 * except that local version do not have the expensive memory barrier.
 * So this file is included twice from asm/cmpxchg.h.
 */