On Thu, Feb 28, 2013 at 03:38:51PM -0600, Jason Detring wrote: > On 2/27/13, Eric Sandeen <sandeen@xxxxxxxxxxx> wrote: > > On 2/27/13 10:50 PM, Eric Sandeen wrote: > >> On 2/27/13 10:38 PM, Eric Sandeen wrote: > >> > >> ... > >> > >>> re-cc'ing xfs list > >>> > >>> So I used pahole to look at all structs, objdump -d to disassemble, > >>> and md5sum'd the results to see what's different. > >>> > >>> pi@raspberrypi ~ $ md5sum cross/*.dis cross/*.pahole native/*.dis > >>> native/*.pahole > >>> > >>> <manual sort> > >>> > >>> c0abd80c3bf049db5e1909fd851261cc cross/xfs-O1-g.ko.pahole > >>> c0abd80c3bf049db5e1909fd851261cc cross/xfs-O2-g.ko.pahole > >>> c0abd80c3bf049db5e1909fd851261cc cross/xfs-Os-g.ko.pahole > >>> c0abd80c3bf049db5e1909fd851261cc native/xfs-O1-g.ko.pahole > >>> c0abd80c3bf049db5e1909fd851261cc native/xfs-O2-g.ko.pahole > >>> c0abd80c3bf049db5e1909fd851261cc native/xfs-Os-g.ko.pahole > >>> > >>> so all structures look identical, good - but: > >>> > >>> while disassembly of these two modules match: > >>> > >>> d76f6ebf4d8a1b9f786facefbcf16f69 cross/xfs-O1-g.ko.dis > >>> d76f6ebf4d8a1b9f786facefbcf16f69 native/xfs-O1-g.ko.dis > >>> > >>> do you see the problem w/ the cross-compiled xfs-O1-g.ko as well? > > No, I didn't. The problem has only shown itself on the -O2 builds, > both native and cross-compiled. Lower optimization levels don't show > any of the symptoms. > > Perhaps a better comparison would be-O2 builds among working and > non-working compilers? You'd asked for these before, but I just > finished them today. The modules, build logs, and fs/xfs/ build trees > are up at > <http://www.splack.org/~jason/projects/xfs-arm-corruption/3.6.11-g89caf39/> > A quick rundown: > -cross-gcc4.4: OK > -cross-gcc4.5: OK > -cross-gcc4.6: BAD > -cross-gcc4.7: BAD > -cross-gcc4.8: OK > Some of these don't seem to want to rmmod after they've been inserted. > Argh reboots. Do we really need to go any further than this to say conclusively that this is a compiler problem? It's clearly not a problem with the C code in that some compilers produce working code.... i.e. what steps do we need to take to get -cross-gcc4.[67] blacklisted when it comes to building ARM kernels? Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
