linux-kernel - Re: [RFC][PATCH] regmap: Drop CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 26 Jun 2019 12:15:08 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [RFC][PATCH] regmap: Drop CONFIG_64BIT checks from core

On Wed, Jun 26, 2019 at 01:31:16AM +0200, Marek Vasut wrote:
> Drop the CONFIG_64BIT checks from core regmap code, as it is well
> possible to access e.g. an SPI device with 64bit registers from a
> 32bit CPU. The CONFIG_64BIT checks are still left in place in the
> regmap mmio code however.

The issue with 8 bit registers was that we use unsigned long for
addresses and values and a 64 bit value won't fit in those on a 32 bit
system.  Some of the bulk APIs will work but things like individual
register writes and the caches will have problems.

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)