From: viresh.kumar@linaro.org (Viresh Kumar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V4 1/2] ACPI / EC: Fix broken 64bit big-endian users of 'global_lock'
Date: Fri, 25 Sep 2015 14:44:38 -0700 [thread overview]
Message-ID: <20150925214438.GH5951@linux> (raw)
In-Reply-To: <2524822.pQu4UKMrlb@vostro.rjw.lan>
On 25-09-15, 22:58, Rafael J. Wysocki wrote:
> Say you have three adjacent fields in a structure, x, y, z, each one byte long.
> Initially, all of them are equal to 0.
>
> CPU A writes 1 to x and CPU B writes 2 to y at the same time.
>
> What's the result?
But then two CPUs can update the same variable as well, and we must
have proper locking in place to fix that.
Anyway, that problem isn't here for sure as its between two
unsigned-longs. So, should I just move it to bool and resend ?
--
viresh
next prev parent reply other threads:[~2015-09-25 21:44 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-25 16:41 [PATCH V4 1/2] ACPI / EC: Fix broken 64bit big-endian users of 'global_lock' Viresh Kumar
2015-09-25 16:41 ` [PATCH V4 2/2] debugfs: Pass bool pointer to debugfs_create_bool() Viresh Kumar
2015-09-25 17:42 ` [PATCH V4 1/2] ACPI / EC: Fix broken 64bit big-endian users of 'global_lock' Johannes Berg
2015-09-25 18:47 ` Viresh Kumar
2015-09-25 18:49 ` Johannes Berg
2015-09-25 18:52 ` Viresh Kumar
2015-09-25 20:26 ` Rafael J. Wysocki
2015-09-25 20:33 ` Rafael J. Wysocki
2015-09-25 20:25 ` Viresh Kumar
2015-09-25 20:58 ` Rafael J. Wysocki
2015-09-25 21:44 ` Viresh Kumar [this message]
2015-09-25 22:19 ` Rafael J. Wysocki
2015-09-26 18:40 ` Viresh Kumar
2015-09-26 19:33 ` Arnd Bergmann
2015-09-27 14:10 ` Rafael J. Wysocki
2015-09-28 8:24 ` Arnd Bergmann
2015-09-28 13:07 ` Rafael J. Wysocki
2015-09-26 19:52 ` James Bottomley
2015-09-27 14:09 ` Rafael J. Wysocki
2015-09-28 8:58 ` David Laight
2015-09-28 14:26 ` James Bottomley
2015-09-28 14:50 ` David Laight
2015-09-28 15:11 ` James Bottomley
2015-09-28 15:31 ` David Laight
2015-09-25 20:18 ` Rafael J. Wysocki
2015-09-25 20:22 ` Rafael J. Wysocki
[not found] ` <CAJPN1uvPyZ+hZ64_0ZXU9wPLuAR-qm06GrRmHTjc9+rgiChYDQ@mail.gmail.com>
2015-09-27 14:35 ` Viresh Kumar
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