On Wed, 23 Apr 2014 10:48:27 -0700 Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > On 04/23/14 10:41, Luiz Capitulino wrote: > > On Wed, 23 Apr 2014 10:10:29 -0700 > > Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > > > >> On 04/22/14 15:21, akpm@xxxxxxxxxxxxxxxxxxxx wrote: > >>> The mm-of-the-moment snapshot 2014-04-22-15-20 has been uploaded to > >>> > >>> http://www.ozlabs.org/~akpm/mmotm/ > >>> > >>> mmotm-readme.txt says > >>> > >>> README for mm-of-the-moment: > >>> > >>> http://www.ozlabs.org/~akpm/mmotm/ > >>> > >>> This is a snapshot of my -mm patch queue. Uploaded at random hopefully > >>> more than once a week. > >>> > >>> You will need quilt to apply these patches to the latest Linus release (3.x > >>> or 3.x-rcY). The series file is in broken-out.tar.gz and is duplicated in > >>> http://ozlabs.org/~akpm/mmotm/series > >>> > >> > >> include/linux/hugetlb.h:468:9: error: 'HPAGE_SHIFT' undeclared (first use in this function) > > > > The patch adding HPAGE_SHIFT usage to hugetlb.h in current mmotm is this: > > > > http://www.ozlabs.org/~akpm/mmotm/broken-out/hugetlb-ensure-hugepage-access-is-denied-if-hugepages-are-not-supported.patch > > > > But I can't reproduce the issue to be sure what the problem is. Are you > > building the kernel on 32bits? Can you provide the output of > > "grep -i huge .config" or send your .config in private? > > > > [adding Richard to cc:] > > > As in $subject, if I build uml x86 32-bit or 64-bit defconfig, the build fails with > this error. Oh, I missed the subject info completely. Sorry about that. So, the issue really seems to be introduced by patch: hugetlb-ensure-hugepage-access-is-denied-if-hugepages-are-not-supported.patch And the problem is that UML doesn't define HPAGE_SHIFT. The following patch fixes it, but I'll let Nishanth decide what to do here. diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 4eace5e..3aab7df 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -458,6 +458,10 @@ static inline spinlock_t *huge_pte_lock(struct hstate *h, return ptl; } +#ifndef HPAGE_SHIFT +#define HPAGE_SHIFT 0 +#endif + static inline bool hugepages_supported(void) { /* -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>