From: Samuel Holland Date: Wed, 27 Mar 2024 04:49:54 +0000 (-0700) Subject: riscv: mm: Always use an ASID to flush mm contexts X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=daef19263fc102551d734f39d9ad417098ffb360;p=linux.git riscv: mm: Always use an ASID to flush mm contexts Even if multiple ASIDs are not supported, using the single-ASID variant of the sfence.vma instruction preserves TLB entries for global (kernel) pages. So it is always more efficient to use the single-ASID code path. Reviewed-by: Alexandre Ghiti Signed-off-by: Samuel Holland Link: https://lore.kernel.org/r/20240327045035.368512-14-samuel.holland@sifive.com Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index 35266dd9a9a2c..44e7ed4e194f8 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -109,8 +109,7 @@ static void __flush_tlb_range(struct cpumask *cmask, unsigned long asid, static inline unsigned long get_mm_asid(struct mm_struct *mm) { - return static_branch_unlikely(&use_asid_allocator) ? - cntx2asid(atomic_long_read(&mm->context.id)) : FLUSH_TLB_NO_ASID; + return cntx2asid(atomic_long_read(&mm->context.id)); } void flush_tlb_mm(struct mm_struct *mm)