linux-kernel - Re: [PATCH 4.14 00/31] 4.14.1-stable review

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Date:   Tue, 21 Nov 2017 19:07:14 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        shuahkh@....samsung.com, patches@...nelci.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 4.14 00/31] 4.14.1-stable review

On Tue, 2017-11-21 at 18:09 +0100, Greg Kroah-Hartman wrote:
> On Tue, Nov 21, 2017 at 04:46:18PM +0000, Ben Hutchings wrote:
> > On Tue, 2017-11-21 at 17:35 +0100, Greg Kroah-Hartman wrote:
> > > On Tue, Nov 21, 2017 at 03:26:10PM +0000, Ben Hutchings wrote:
> > 
> > [...]
> > > > Not all 32-bit configurations can provide cmpxchg64().  i40e's use of
> > > > cmpxchg64() appears to be fixed by:
> > > > 
> > > > b74f571f59a8 i40e/i40evf: organize and re-number feature flags
> > > > b48be9978e4b i40e: fix flags declaration
> > > 
> > > So without those patches, are any specific arches/configs broken for
> > > 4.14?
> > 
> > 32-bit parisc is.
> 
> Ok, but that's a horrid hack on the i40e driver, it just happens to move
> the bitfield to a 32bit variable.  Can't we just provide a "real"
> cmpxchg64() for 32-bit parisc?

No.  There is a generic implementation of cmpxchg64() but it is only
suitable for non-SMP configurations.

> Or mark this driver as not buildable on that platform?

I suggested adding a 'depends 64BIT' but got no response.

Ben.

> I doubt anyone is doing 40gb networking on parisc :)
> 
> thanks,
> 
> greg k-h
> 
-- 
Ben Hutchings
Software Developer, Codethink Ltd.