On 02/02/18 17:32, James Pearson wrote: > Phil Perry wrote: >> >> It looks like a regression. This was originally fixed upstream >> (kernel.org) 3 years ago, so if the RHEL7.5 beta kernel has reverted to >> 'EXPORT_SYMBOL_GPL' then it is a regression that will break building any >> out-of-tree non-gpl modules which need to set caching mode in pte's >> >> You should file a bug report with Red Hat. >> >> The correct fix in the kernel is in arch/x86/mm/init.c >> >> -EXPORT_SYMBOL_GPL(__cachemode2pte_tbl); >> +EXPORT_SYMBOL(__cachemode2pte_tbl); > > Well, that's the rub - RHEL7 have never had that upstream fix - i.e. the > el7.4 kernel (3.10.0-693.el7) has > 'EXPORT_SYMBOL_GPL(__cachemode2pte_tbl)' as does the el7.5b kernel > (3.10.0-830.el7) ... > > The Nvidia driver builds/installs OK on el7.4 - but not on el7.5b > > I'll report this to Red Hat anyway ... > > Thanks > > James Pearson > Ah, I'd not checked the sources, you are correct. I do not have an explanation for the differing behaviour between 7.4 and 7.5beta. It looks like both __cachemode2pte_tbl and __pte2cachemode_tbl need updating in arch/x86/mm/init.c If you file a bug, please could you mail the link so I can add myself to the CC. Thanks.