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:   Mon, 02 Oct 2023 20:14:47 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Frank Li" <Frank.Li@....com>, "Baoquan He" <bhe@...hat.com>
Cc:     dmaengine@...r.kernel.org,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        imx@...ts.linux.dev, linux-kernel@...r.kernel.org,
        "kernel test robot" <lkp@...el.com>, oe-kbuild-all@...ts.linux.dev,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "Vinod Koul" <vkoul@...nel.org>
Subject: Re: [PATCH v2 1/1] fs: debugfs: fix build error at powerpc platform

On Mon, Oct 2, 2023, at 16:57, Frank Li wrote:
> ld: fs/debugfs/file.o: in function `debugfs_print_regs':
>    file.c:(.text+0x95a): undefined reference to `ioread64be'
>>> ld: file.c:(.text+0x9dd): undefined reference to `ioread64'
>
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: 
> https://lore.kernel.org/oe-kbuild-all/202309291322.3pZiyosI-lkp@intel.com/
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---

I still think this is wrong, for the reasons I explained in
https://lore.kernel.org/all/b795ed61-0174-487f-a263-8431e7c76af5@app.fastmail.com/

The part that I had missed earlier is how this is
related to GENERIC_IOMAP, since on those architectures,
the ioread helpers are not just fixed-endian MMIO accessors
like readl and readq but also multiplex to the PIO functions
(inb/inw/inl) that do not have a 64-bit version because x86
and PCI both only define those up to 32 bit width.

The best workaround is probably to use readq() instead of
ioread64(), or swab64(readl()) instead of ioread64_be().

This should work on all 64-bit architectures, plus any 32-bit
one that defines readq(), so you can just use an 'ifdef readq'
around the call.

     Arnd

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ