From: Peter Xu <peterx@redhat.com> mainline inclusion from mainline-v6.15-rc1 commit 0fff2aa96f6be6d33b584d73b16d3672fd30fd5c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ID4NL4 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- Keith Busch observed some incorrect macros defined in arm64 code [1]. It turns out the two lines should never be needed and won't be exposed to anyone, because aarch64 doesn't select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD, hence ARCH_SUPPORTS_PUD_PFNMAP is always N. The only archs that support THP PUDs so far are x86 and powerpc. Instead of fixing the lines (with no way to test it..), remove the two lines that are in reality dead code, to avoid confusing readers. Fixes tag is attached to reflect where the wrong macros were introduced, but explicitly not copying stable, because there's no real issue to be fixed. So it's only about removing the dead code so far. [1] https://lore.kernel.org/all/Z9tDjOk-JdV_fCY4@kbusch-mbp.dhcp.thefacebook.com... Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Donald Dutile <ddutile@redhat.com> Cc: Will Deacon <will@kernel.org> Fixes: 3e509c9b03f9 ("mm/arm64: support large pfn mappings") Reported-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Donald Dutile <ddutile@redhat.com> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Link: https://lore.kernel.org/r/20250320183405.12659-1-peterx@redhat.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Conflicts: arch/arm64/include/asm/pgtable.h [Context conflicts.] Signed-off-by: Yin Tirui <yintirui@huawei.com> --- arch/arm64/include/asm/pgtable.h | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 3ab1bf347951..38c9d78b639c 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -540,11 +540,6 @@ static inline pmd_t pmd_mkspecial(pmd_t pmd) #define pud_pfn(pud) ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT) #define pfn_pud(pfn,prot) __pud(__phys_to_pud_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) -#ifdef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP -#define pud_special(pte) pte_special(pud_pte(pud)) -#define pud_mkspecial(pte) pte_pud(pte_mkspecial(pud_pte(pud))) -#endif - #define pmd_pgprot pmd_pgprot static inline pgprot_t pmd_pgprot(pmd_t pmd) { -- 2.43.0