From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org,
Andrew Cooper <andrew.cooper3@citrix.com>,
virtualization@lists.linux-foundation.org,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
"H. Peter Anvin" <hpa@zytor.com>,
David Miller <davem@davemloft.net>,
linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, sparclinux@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-metag@vger.kernel.org, linux-mips@linux-mips.org,
x86@kernel.org, user-mode-linux-devel@lists.sourceforge.net,
adi-buildroot-devel@lists.sourceforge.net,
linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org,
xen-devel@lists.xenproject.org,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Andrey Konovalov <andreyknvl@google.com>,
Christian Borntraeger <borntraeger@de.ibm.com>
Subject: Re: [PATCH v2 06/32] s390: reuse asm-generic/barrier.h
Date: Mon, 4 Jan 2016 16:03:39 +0100 [thread overview]
Message-ID: <20160104160339.25101b5d@mschwide> (raw)
In-Reply-To: <20160104132042.GW6344@twins.programming.kicks-ass.net>
On Mon, 4 Jan 2016 14:20:42 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
> On Thu, Dec 31, 2015 at 09:06:30PM +0200, Michael S. Tsirkin wrote:
> > On s390 read_barrier_depends, smp_read_barrier_depends
> > smp_store_mb(), smp_mb__before_atomic and smp_mb__after_atomic match the
> > asm-generic variants exactly. Drop the local definitions and pull in
> > asm-generic/barrier.h instead.
> >
> > This is in preparation to refactoring this code area.
> >
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > Acked-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> > arch/s390/include/asm/barrier.h | 10 ++--------
> > 1 file changed, 2 insertions(+), 8 deletions(-)
> >
> > diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
> > index 7ffd0b1..c358c31 100644
> > --- a/arch/s390/include/asm/barrier.h
> > +++ b/arch/s390/include/asm/barrier.h
> > @@ -30,14 +30,6 @@
> > #define smp_rmb() rmb()
> > #define smp_wmb() wmb()
> >
> > -#define read_barrier_depends() do { } while (0)
> > -#define smp_read_barrier_depends() do { } while (0)
> > -
> > -#define smp_mb__before_atomic() smp_mb()
> > -#define smp_mb__after_atomic() smp_mb()
>
> As per:
>
> lkml.kernel.org/r/20150921112252.3c2937e1@mschwide
>
> s390 should change this to barrier() instead of smp_mb() and hence
> should not use the generic versions.
Yes, we wanted to simplify this. Thanks for the reminder, I'll queue
a patch.
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
next prev parent reply other threads:[~2016-01-04 15:04 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-31 19:05 [PATCH v2 00/34] arch: barrier cleanup + barriers for virt Michael S. Tsirkin
2015-12-31 19:05 ` [PATCH v2 01/32] lcoking/barriers, arch: Use smp barriers in smp_store_release() Michael S. Tsirkin
2015-12-31 19:05 ` [PATCH v2 02/32] asm-generic: guard smp_store_release/load_acquire Michael S. Tsirkin
2015-12-31 19:06 ` [PATCH v2 03/32] ia64: rename nop->iosapic_nop Michael S. Tsirkin
2015-12-31 19:06 ` [PATCH v2 04/32] ia64: reuse asm-generic/barrier.h Michael S. Tsirkin
2015-12-31 19:06 ` [PATCH v2 05/32] powerpc: " Michael S. Tsirkin
2015-12-31 19:06 ` [PATCH v2 06/32] s390: " Michael S. Tsirkin
2016-01-04 13:20 ` Peter Zijlstra
2016-01-04 15:03 ` Martin Schwidefsky [this message]
2016-01-04 20:42 ` Michael S. Tsirkin
2016-01-05 8:03 ` Martin Schwidefsky
2016-01-04 20:34 ` Michael S. Tsirkin
2015-12-31 19:06 ` [PATCH v2 07/32] sparc: " Michael S. Tsirkin
2015-12-31 19:43 ` David Miller
2015-12-31 19:06 ` [PATCH v2 08/32] arm: " Michael S. Tsirkin
2016-01-02 11:20 ` Russell King - ARM Linux
2015-12-31 19:06 ` [PATCH v2 09/32] arm64: " Michael S. Tsirkin
2015-12-31 19:07 ` [PATCH v2 10/32] metag: " Michael S. Tsirkin
2016-01-04 23:24 ` James Hogan
2015-12-31 19:07 ` [PATCH v2 11/32] mips: " Michael S. Tsirkin
2016-01-04 13:26 ` Peter Zijlstra
2015-12-31 19:07 ` [PATCH v2 12/32] x86/um: " Michael S. Tsirkin
2016-01-05 23:12 ` Richard Weinberger
2015-12-31 19:07 ` [PATCH v2 13/32] x86: " Michael S. Tsirkin
2015-12-31 19:07 ` [PATCH v2 14/32] asm-generic: add __smp_xxx wrappers Michael S. Tsirkin
2015-12-31 19:07 ` [PATCH v2 15/32] powerpc: define __smp_xxx Michael S. Tsirkin
2016-01-05 1:36 ` Boqun Feng
2016-01-05 8:51 ` Michael S. Tsirkin
2016-01-05 9:53 ` Boqun Feng
2016-01-05 16:16 ` Michael S. Tsirkin
2016-01-06 1:51 ` Boqun Feng
2016-01-06 20:23 ` Michael S. Tsirkin
2016-01-07 0:43 ` Boqun Feng
2015-12-31 19:07 ` [PATCH v2 16/32] arm64: " Michael S. Tsirkin
2015-12-31 19:07 ` [PATCH v2 17/32] arm: " Michael S. Tsirkin
2016-01-02 11:24 ` Russell King - ARM Linux
2016-01-03 9:12 ` Michael S. Tsirkin
2016-01-04 13:36 ` Peter Zijlstra
2016-01-04 13:54 ` Peter Zijlstra
2016-01-04 13:59 ` Russell King - ARM Linux
2016-01-05 14:38 ` Michael S. Tsirkin
2016-01-04 20:39 ` Michael S. Tsirkin
2016-01-04 20:12 ` Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 18/32] blackfin: " Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 19/32] ia64: " Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 20/32] metag: " Michael S. Tsirkin
2016-01-04 13:41 ` Peter Zijlstra
2016-01-04 15:25 ` James Hogan
2016-01-04 15:30 ` Peter Zijlstra
2016-01-04 16:04 ` James Hogan
2016-01-05 0:09 ` James Hogan
2016-01-11 11:10 ` Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 21/32] mips: " Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 22/32] s390: " Michael S. Tsirkin
2016-01-04 13:45 ` Peter Zijlstra
2016-01-04 20:18 ` Michael S. Tsirkin
2016-01-05 8:13 ` Martin Schwidefsky
2016-01-05 9:30 ` Michael S. Tsirkin
2016-01-05 12:08 ` Martin Schwidefsky
2016-01-05 13:04 ` Michael S. Tsirkin
2016-01-05 14:21 ` Martin Schwidefsky
2016-01-05 15:39 ` Christian Borntraeger
2016-01-05 16:04 ` Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 23/32] sh: define __smp_xxx, fix smp_store_mb for !SMP Michael S. Tsirkin
2015-12-31 19:08 ` [PATCH v2 24/32] sparc: define __smp_xxx Michael S. Tsirkin
2015-12-31 19:44 ` David Miller
2015-12-31 19:09 ` [PATCH v2 25/32] tile: " Michael S. Tsirkin
2015-12-31 19:09 ` [PATCH v2 26/32] xtensa: " Michael S. Tsirkin
2015-12-31 19:09 ` [PATCH v2 27/32] x86: " Michael S. Tsirkin
2015-12-31 19:09 ` [PATCH v2 28/32] asm-generic: implement virt_xxx memory barriers Michael S. Tsirkin
2015-12-31 19:09 ` [PATCH v2 29/32] Revert "virtio_ring: Update weak barriers to use dma_wmb/rmb" Michael S. Tsirkin
2015-12-31 19:09 ` [PATCH v2 30/32] virtio_ring: update weak barriers to use __smp_XXX Michael S. Tsirkin
2016-01-01 10:21 ` [PATCH v2 30/32] virtio_ring: update weak barriers to use __smp_xxx Michael S. Tsirkin
2015-12-31 19:09 ` [PATCH v2 31/32] sh: support a 2-byte smp_store_mb Michael S. Tsirkin
2016-01-04 14:05 ` Peter Zijlstra
2015-12-31 19:09 ` [PATCH v2 32/32] virtio_ring: use virt_store_mb Michael S. Tsirkin
2016-01-01 17:23 ` Sergei Shtylyov
2016-01-03 9:01 ` Michael S. Tsirkin
2015-12-31 19:10 ` [PATCH v2 33/34] xenbus: use virt_xxx barriers Michael S. Tsirkin
2016-01-04 11:32 ` [Xen-devel] " David Vrabel
2016-01-04 12:03 ` Stefano Stabellini
2016-01-04 14:09 ` Peter Zijlstra
2015-12-31 19:10 ` [PATCH v2 34/34] xen/io: " Michael S. Tsirkin
2016-01-04 11:32 ` [Xen-devel] " David Vrabel
2016-01-04 12:05 ` Stefano Stabellini
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