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Date: Wed, 26 Jan 2022 18:30:09 +0100 From: Ard Biesheuvel <ardb@...nel.org> To: linux-arm-kernel@...ts.infradead.org Cc: kvmarm@...ts.cs.columbia.edu, linux-hardening@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>, Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>, Fuad Tabba <tabba@...gle.com>, Quentin Perret <qperret@...gle.com>, Mark Rutland <mark.rutland@....com>, James Morse <james.morse@....com>, Catalin Marinas <catalin.marinas@....com> Subject: [RFC PATCH 10/12] mm: add default definition of p4d_index() Implement a default version of p4d_index() similar to how pud/pmd_index are defined. Signed-off-by: Ard Biesheuvel <ardb@...nel.org> --- include/linux/pgtable.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index bc8713a76e03..e8aacf6ea207 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -79,6 +79,14 @@ static inline unsigned long pud_index(unsigned long address) #define pud_index pud_index #endif +#ifndef p4d_index +static inline unsigned long p4d_index(unsigned long address) +{ + return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1); +} +#define p4d_index p4d_index +#endif + #ifndef pgd_index /* Must be a compile-time constant, so implement it as a macro */ #define pgd_index(a) (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) -- 2.30.2
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