Subject: Re: Build errors due to 64 bit xchg/cmpxchg operations in fs/nfs/flexfilelayout

From: Guenter Roeck <[email-masked]>
Date: Fri, 26 Jun 2015 22:39:06 -0700

On 06/26/2015 09:15 PM, Trond Myklebust wrote:
>
> On Jun 27, 2015 12:09 AM, "Guenter Roeck" <[email-masked] <mailto:[email-masked]>> wrote:
>  >
>  > Hi,
>  >
>  > commits 'pNFS/flexfiles: add layoutstats tracking' and 'pnfs/flexfiles: report layoutstat
>  > regularly' in -next introduce 64 bit xchg and cmpxchg operations. This causes compile
>  > errors with 32 bit builds on architectures which do not support those operations.
>  >
>  > arm:shmobile_defconfig:
>  >
>  > fs/built-in.o: In function `nfs4_ff_end_busy_timer':
>  > :(.text+0xa7110): undefined reference to `__bad_xchg'
>  > fs/built-in.o: In function `nfs4_ff_layoutstat_start_io':
>  > :(.text+0xa7304): undefined reference to `__bad_cmpxchg'
>  > :(.text+0xa731c): undefined reference to `__bad_cmpxchg'
>  > :(.text+0xa73d8): undefined reference to `__bad_cmpxchg'
>  >
>  > xtensa:allmodconfig:
>  >
>  > ERROR: "__xchg_called_with_bad_pointer" [fs/nfs/flexfilelayout/nfs_layout_flexfiles.ko] undefined!
>  > ERROR: "__cmpxchg_called_with_bad_pointer" [fs/nfs/flexfilelayout/nfs_layout_flexfiles.ko] undefined!
>  >
>  > Guenter
>
> Hi Guenter
>
> Is this still the case with today's update? The latest patch from Tao was intended to remove those calls.
>

Hi Trond,

This is with next-20150626. I'll let you know if it still happens with the next build.

Guenter