On Tue, Apr 02, 2024 at 06:43:56PM -0400, Peter Xu wrote: > I actually tested this without hitting the issue (even though I didn't > mention it in the cover letter..). I re-kicked the build test, it turns > out my "make alldefconfig" on loongarch will generate a config with both > HUGETLB=n && THP=n, while arch/loongarch/configs/loongson3_defconfig has > THP=y (which I assume was the one above build used). I didn't further > check how "make alldefconfig" generated the config; a bit surprising that > it didn't fetch from there. I suspect it is weird compiler variations.. Maybe something is not being inlined. > (and it also surprises me that this BUILD_BUG can trigger.. I used to try > triggering it elsewhere but failed..) As the pud_leaf() == FALSE should result in the BUILD_BUG never being called and the optimizer removing it. Perhaps the issue is that the pud_leaf() is too far from the pud_pfn? Jason
