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:   Fri, 14 Jun 2019 23:10:36 +0530
From:   "Aneesh Kumar K.V" <>
To:     Jeff Moyer <>
Cc:     Dan Williams <>,
        Oscar Salvador <>, Qian Cai <>,
        Andrew Morton <>,
        Linux MM <>,
        Linux Kernel Mailing List <>,
        linux-nvdimm <>
Subject: Re: [PATCH -next] mm/hotplug: skip bad PFNs from pfn_to_online_page()

On 6/14/19 10:38 PM, Jeff Moyer wrote:
> "Aneesh Kumar K.V" <> writes:
>> On 6/14/19 10:06 PM, Dan Williams wrote:
>>> On Fri, Jun 14, 2019 at 9:26 AM Aneesh Kumar K.V
>>> <> wrote:
>>>> Why not let the arch
>>>> arch decide the SUBSECTION_SHIFT and default to one subsection per
>>>> section if arch is not enabled to work with subsection.
>>> Because that keeps the implementation from ever reaching a point where
>>> a namespace might be able to be moved from one arch to another. If we
>>> can squash these arch differences then we can have a common tool to
>>> initialize namespaces outside of the kernel. The one wrinkle is
>>> device-dax that wants to enforce the mapping size,
>> The fsdax have a much bigger issue right? The file system block size
>> is the same as PAGE_SIZE and we can't make it portable across archs
>> that support different PAGE_SIZE?
> File system blocks are not tied to page size.  They can't be *bigger*
> than the page size currently, but they can be smaller.

ppc64 page size is 64K.

> Still, I don't see that as an arugment against trying to make the
> namespaces work across architectures.  Consider a user who only has
> sector mode namespaces.  We'd like that to work if at all possible.

agreed. I was trying to list out the challenges here.


Powered by blists - more mailing lists