From: Peter Xu <peterx@xxxxxxxxxx> Hi, This is a small patchset that will fix two known issues that got reported today on the previous hugetlb unification series on slow gup [1]. The first issue was reported by Ryan Roberts [2] on a test failure over gup_longterm. Patch 1-2 should fix it. Tested with 32MB hugepages on arm64 VM. The second issue was reported by Nathan Chancellor [3] on a build issue over loongson's defconfig (loongson3_defconfig). It can be easily reproduced with my own build setup [4], while patch 3 fixes it, and should hopefully fix similar archs where pud_pfn() is not defined even if pud_leaf() can return true. For the 2nd issue, it's debatable whether it's an arch issue, because logically speaking pud_pfn() and pud_leaf() should either be both defined or both not. But since the current fix will be the simplest and still safe (I at least checked loongarch doesn't support either pud dax or pud hugetlb), I think we can consider having this to unbreak the build first, assuming this could also happen to other archs. One note is that the last 2 patches should be squashed into corresponding patch, while the 1st patch should be kept standalone. Thanks, [1] https://lore.kernel.org/r/20240327152332.950956-1-peterx@xxxxxxxxxx [2] https://lore.kernel.org/r/adfdd89b-ee56-4758-836e-c66a0be7de25@xxxxxxx [3] https://lore.kernel.org/r/ZgyKLLVZ4vN56uZE@x1n [4] https://gitlab.com/peterx/lkb-harness/-/blob/main/config.json?ref_type=heads#L32 Peter Xu (3): mm: Allow anon exclusive check over hugetlb tail pages fixup! mm/gup: handle huge pmd for follow_pmd_mask() fixup! mm/arch: provide pud_pfn() fallback include/linux/page-flags.h | 8 +++++++- include/linux/pgtable.h | 6 +++++- mm/gup.c | 3 --- mm/internal.h | 10 ---------- 4 files changed, 12 insertions(+), 15 deletions(-) -- 2.44.0
