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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/14/2025 10:15 PM, James Houghton wrote: > On Thu, May 8, 2025 at 3:20 AM Ignacio Moreno Gonzalez via B4 Relay > wrote: >> >> From: Ignacio Moreno Gonzalez >> >> VM_NOHUGEPAGE is a no-op if CONFIG_TRANSPARENT_HUGEPAGE is disabled. So >> it makes no sense to return an error when calling madvise() with >> MADV_NOHUGEPAGE in that case. >> >> Suggested-by: Matthew Wilcox >> Signed-off-by: Ignacio Moreno Gonzalez >> --- >> https://lore.kernel.org/linux-mm/20250502-map-map_stack-to-vm_nohugepage-only-if-thp-is-enabled-v1-1-113cc634cd51@kuka.com >> >> Here it is presented as a separate thread to avoid mixing stable and >> non-stable patches. >> >> This change makes calling madvise(addr, size, MADV_NOHUGEPAGE) on !THP >> kernels to return 0 instead of -EINVAL. >> --- >> include/linux/huge_mm.h | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h >> index e893d546a49f464f7586db639fe216231f03651a..5fca742dc5ba784ffccea055b07247707d16cc67 100644 >> --- a/include/linux/huge_mm.h >> +++ b/include/linux/huge_mm.h >> @@ -509,6 +509,8 @@ bool unmap_huge_pmd_locked(struct vm_area_struct *vma, unsigned long addr, >> >> #else /* CONFIG_TRANSPARENT_HUGEPAGE */ >> >> +#include >> + >> static inline bool folio_test_pmd_mappable(struct folio *folio) >> { >> return false; >> @@ -598,6 +600,9 @@ static inline bool unmap_huge_pmd_locked(struct vm_area_struct *vma, >> static inline int hugepage_madvise(struct vm_area_struct *vma, >> unsigned long *vm_flags, int advice) >> { >> + /* On a !THP kernel, MADV_NOHUGEPAGE is a no-op, but MADV_NOHUGEPAGE is not supported */ > > Do you mean "but MADV_HUGEPAGE is not supported"? Just want to make > sure; it seems like no one else has asked about this yet. > Yes, this is a typo. It should be MADV_HUGEPAGE. Thanks! >> + if (advice == MADV_NOHUGEPAGE) >> + return 0; >> return -EINVAL; >> } >