linux-kernel - Re: unaligned accesses in SLAB etc.

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Date:	Thu, 16 Oct 2014 23:11:49 +0300 (EEST)
From:	Meelis Roos <mroos@...ux.ee>
To:	David Miller <davem@...emloft.net>
cc:	iamjoonsoo.kim@....com,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	sparclinux@...r.kernel.org
Subject: Re: unaligned accesses in SLAB etc.

> > Hopefully, this should be a simply matter of doing a complete build
> > with gcc-4.9, then removing the object file we want to selectively
> > build with the older compiler and then going:
> > 
> > 	make CC="gcc-4.6" arch/sparc/mm/init_64.o
> > 
> > then relinking with plain 'make'.
> > 
> > If the build system rebuilds the object file on you when you try
> > to relink the final kernel image, we'll have to do some of this
> > by hand to make the test.
> 
> Unfortunately it starts a full rebuild with plain make after compiling 
> some files with gcc-4.6 - detects CC change?

Figured out from make V=1 how to call gcc-4.6 directly, so far my 
bisection shows that it one or probably more of arch/sparc/kernel/*.c 
but probably more than 1 - 2 halfs of it both failed. Still bisecting.

-- 
Meelis Roos (mroos@...ux.ee)
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