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From: Peter Zijlstra <peterz@infradead.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Qian Cai <cai@lca.pw>, Jason Gunthorpe <jgg@mellanox.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH] mm/debug: add a cast to u64 for atomic64_read()
Date: Wed, 13 Mar 2019 15:21:43 +0100	[thread overview]
Message-ID: <20190313142142.GE5996@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAK8P3a3_2O7KBKTSD-QC5tcpohy8bkVVHsdAJnanTU1B+H12-w@mail.gmail.com>

On Wed, Mar 13, 2019 at 02:46:55PM +0100, Arnd Bergmann wrote:
> I thiunk it needs an '__attribute__((aligned(8)))' annotation at least on
> x86-32, 

I _hate_ that s64 isn't already natively aligned.

Anyway, yes, unaligned atomics are a _bad_ idea if they work at all.


  reply	other threads:[~2019-03-13 14:21 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-10 18:30 [PATCH] mm/debug: add a cast to u64 for atomic64_read() Qian Cai
2019-03-11  3:58 ` Davidlohr Bueso
2019-03-11 12:21   ` Jason Gunthorpe
2019-03-11 14:00     ` Qian Cai
2019-03-11 14:20       ` Arnd Bergmann
2019-03-13  9:18         ` Peter Zijlstra
2019-03-13 13:46           ` Arnd Bergmann
2019-03-13 14:21             ` Peter Zijlstra [this message]
2019-03-13 14:24             ` Peter Zijlstra
2019-03-13 14:35           ` Mark Rutland
2019-03-13 14:57             ` Arnd Bergmann
2019-03-13 16:29               ` Mark Rutland
2019-03-11 14:00     ` Arnd Bergmann

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