On Wed, Sep 23, 2015 at 12:43:21PM +0200, Yann Dupont - Veille Techno wrote: > Le 22/09/2015 00:52, Dave Chinner a écrit : > >As it is, I highly recommend that you try a current 4.3 kernel, as > >there are several code fixes in the XFS kernel code that work > >around compiler issues we know about. AFAIA, the do_div() asm bug > >that trips recent gcc optimisations isn't in the upstream kernel > >yet, but that can be worked around by setting > >CONFIG_CC_OPTIMIZE_FOR_SIZE=y in your build. > > Hi dave, > > I can confirm that CONFIG_CC_OPTIMIZE_FOR_SIZE=y is (was ?) the only > way for me to have reliable XFS kernel code on different arm > platforms (Marvell kirkwood, Allwinner A20, Amlogic S805), no matter > what recent gcc version I've been using. > > I must admit I was cross-compiling from X86-64 too, but I think (not > sure) that it was also the case with native gcc. > > I must also admit that I didn't tried since some months, because > CONFIG_CC_OPTIMIZE_FOR_SIZE=y was the silver bullet for arm xfs > kernel crashes. This crash was difficult to understand because it > occurs quite randomly (I.e it can take several hours to trigger) > > If there's a patch floating around for gcc (or kernel), I'm > interested to test. See this subthread from august: http://oss.sgi.com/archives/xfs/2015-08/msg00234.html AFAICT, the do_div patch to fix the problem has not yet been picked up - it's not in the 4.3-rc2 kernel... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
