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charset="UTF-8" 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: On Thu, Nov 5, 2020 at 6:26 PM Catalin Marinas wrote: > > On Thu, Nov 05, 2020 at 12:18:45AM +0100, Andrey Konovalov wrote: > > diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c > > index 06ba6c923ab7..fcfbefcc3174 100644 > > --- a/arch/arm64/kernel/mte.c > > +++ b/arch/arm64/kernel/mte.c > > @@ -121,6 +121,13 @@ void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag) > > return ptr; > > } > > > > +void __init mte_init_tags(u64 max_tag) > > +{ > > + /* Enable MTE Sync Mode for EL1. */ > > + sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC); > > + isb(); > > +} > > Is this going to be called on each CPU? I quickly went through the rest > of the patches and couldn't see how. Yes, on each CPU. This is done via kasan_init_hw_tags() that is called from cpu_enable_mte(). This change is added in the "kasan, arm64: implement HW_TAGS runtime". Would it make sense to put it into a separate patch?