linux-kernel - Re: [PATCH v2 07/21] x86/io: Remove useless definition of mmiowb()

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Date:   Fri, 5 Apr 2019 16:14:23 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Will Deacon <will.deacon@....com>
cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Daniel Lustig <dlustig@...dia.com>,
        David Howells <dhowells@...hat.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Maciej W. Rozycki" <macro@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Ingo Molnar <mingo@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, Tony Luck <tony.luck@...el.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Akira Yokosawa <akiyks@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH v2 07/21] x86/io: Remove useless definition of mmiowb()

On Fri, 5 Apr 2019, Will Deacon wrote:

> x86 maps mmiowb() to barrier(), but this is superfluous because a
> compiler barrier is already implied by spin_unlock(). Since x86 also
> includes asm-generic/io.h in its asm/io.h file, we can remove the

s/we can//

> definition entirely and pick up the dummy definition from core code.
> 
> Signed-off-by: Will Deacon <will.deacon@....com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>