linux-kernel - Re: [lustre-devel] [PATCH] staging: lustre: ptlrpc: re-export lustre_swab_[lmv|lov]_mds

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Date:   Tue, 20 Sep 2016 16:32:37 +0100 (BST)
From:   James Simmons <jsimmons@...radead.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, James Simmons <uja.ornl@...oo.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [lustre-devel] [PATCH] staging: lustre: ptlrpc: re-export
 lustre_swab_[lmv|lov]_mds_md


> > On Tue, Sep 20, 2016 at 11:52:19AM +0300, Dan Carpenter wrote:
> > > On Tue, Sep 20, 2016 at 08:47:02AM +0200, Greg Kroah-Hartman wrote:
> > > > On Mon, Sep 19, 2016 at 01:27:05PM -0400, James Simmons wrote:
> > > > > Being over zealous in removing unused EXPORT_SYMBOLs two functions
> > > > > lustre_swab_[lmv|lov]_mds_md exports were removed. They need to be
> > > > > exported so this patch restores those EXPORT_SYMBOLS. Same mistake
> > > > > was done when porting to the upstream client.
> > > > 
> > > > How did our build testing not catch this?  What needs these exports?  Is
> > > > it any in-kernel code?
> > > > 
> > > > confused,
> > > 
> > > It did catch it...
> > 
> > It did?  Works here for me, and I didn't see an error report anywhere...
> > 
> > > James, every patch has to be buildable (bisectable) so the original
> > > patch is never going to be merged.
> > 
> > What is the "original" patch here?
> > 
> 
> [PATCH 112/124] staging: lustre: ptlrpc: remove unnecessary EXPORT_SYMBOL
> 
> kbuild responded to the email that it broke compilation on s360 but I
> don't think the breakage is arch specific?

But it is. The breakage appears on only a subset of platforms. All the 
patches I sent are tested on a real file system setup using our special
test suite. This was done on x86 hardware where the problem doesn't show
up. I guess I need to ask work for a non-x86 platform to test with :-)