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  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:   Tue, 30 Apr 2019 13:37:54 +0100
From:   Robin Murphy <>
To:     Christoph Hellwig <>,
        Nicolin Chen <>
Subject: Re: [RFC/RFT PATCH 1/2] dma-contiguous: Simplify
 dma_*_from_contiguous() function calls

On 30/04/2019 11:56, Christoph Hellwig wrote:
> So while I really, really like this cleanup it turns out it isn't
> actually safe for arm :(  arm remaps the CMA allocation in place
> instead of using a new mapping, which can be done because they don't
> share PMDs with the kernel.
> So we'll probably need a __dma_alloc_from_contiguous version with
> an additional bool fallback argument - everyone but arms uses
> dma_alloc_from_contiguous as in your patch, just arm will get the
> non-fallback one.

Or we even just implement dma_{alloc,free}_contiguous() as a wrapper 
around the existing APIs so that users can be thoroughly checked and 
converted one-by-one.


Powered by blists - more mailing lists