From: Christoph Hellwig <hch@infradead.org>
To: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
Alexander Duyck <alexander.duyck@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Russell King <linux@armlinux.org.uk>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
"David S. Miller" <davem@davemloft.net>,
Chris Zankel <chris@zankel.net>,
Max Filippov <jcmvbkbc@gmail.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-sh@vger.kernel.org,
sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
linux-mm@kvack.org
Subject: Re: [PATCH v4 3/4] mm/pageblock: work around multiple arch's cmpxchg support issue
Date: Thu, 10 Sep 2020 06:51:12 +0100 [thread overview]
Message-ID: <20200910055112.GA11727@infradead.org> (raw)
In-Reply-To: <1599116482-7410-3-git-send-email-alex.shi@linux.alibaba.com>
On Thu, Sep 03, 2020 at 03:01:22PM +0800, Alex Shi wrote:
> Armv6, sh2, sparc32 and xtensa can not do cmpxchg1, so we have to use
> cmpxchg4 on it.
>
> Here we mark above 4 arch's NO_CMPXCHG_BYTE, and would add more if we
> found.
>
> This is the first usages of cmpxchg flase sharing change. We'd better
> check more cmpxchg usages in current kernel...
I think a positive symbol, e.g. HAVE_CMPXCHG_BYTE is a lot easier to
understand, and also fool-proof.
next prev parent reply other threads:[~2020-09-10 5:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 7:01 [PATCH v4 1/4] mm/pageblock: mitigation cmpxchg false sharing in pageblock flags Alex Shi
2020-09-03 7:01 ` [PATCH v4 2/4] mm/pageblock: remove false sharing in pageblock_flags Alex Shi
2020-09-03 7:01 ` [PATCH v4 3/4] mm/pageblock: work around multiple arch's cmpxchg support issue Alex Shi
2020-09-03 7:29 ` Max Filippov
2020-09-03 8:50 ` Alex Shi
2020-09-10 5:51 ` Christoph Hellwig [this message]
2020-09-03 7:24 ` [PATCH v4 1/4] mm/pageblock: mitigation cmpxchg false sharing in pageblock flags Mel Gorman
2020-09-03 8:32 ` Alex Shi
2020-09-03 8:40 ` Alex Shi
2020-09-03 9:00 ` Vlastimil Babka
2020-09-03 9:31 ` Mel Gorman
2020-09-03 8:19 ` David Hildenbrand
2020-09-03 9:14 ` Alex Shi
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