From: Peter Xu Date: Thu, 20 Mar 2025 18:34:05 +0000 (-0400) Subject: arm64: mm: Drop dead code for pud special bit handling X-Git-Tag: v6.15-rc1~35^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0fff2aa96f6be6d33b584d73b16d3672fd30fd5c;p=thirdparty%2Fkernel%2Flinux.git arm64: mm: Drop dead code for pud special bit handling 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/#t Cc: Alex Williamson Cc: Donald Dutile Cc: Will Deacon Fixes: 3e509c9b03f9 ("mm/arm64: support large pfn mappings") Reported-by: Keith Busch Signed-off-by: Peter Xu Reviewed-by: Donald Dutile Reviewed-by: Anshuman Khandual Link: https://lore.kernel.org/r/20250320183405.12659-1-peterx@redhat.com Signed-off-by: Catalin Marinas --- diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 84f05f781a70d..d3b538be1500b 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -633,11 +633,6 @@ static inline pud_t pud_mkhuge(pud_t pud) #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) {