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SubjectRe: [PATCH 22/30] x86, pcid, kaiser: allow flushing for future ASID switches
On Wed, Nov 08, 2017 at 11:47:28AM -0800, Dave Hansen wrote:
> +/*
> + * We get here when we do something requiring a TLB invalidation
> + * but could not go invalidate all of the contexts. We do the
> + * necessary invalidation by clearing out the 'ctx_id' which
> + * forces a TLB flush when the context is loaded.
> + */
> +void clear_non_loaded_ctxs(void)
> +{
> + u16 asid;
> +
> + /*
> + * This is only expected to be set if we have disabled
> + * kernel _PAGE_GLOBAL pages.
> + */
> + if (IS_ENABLED(CONFIG_X86_GLOBAL_PAGES)) {
> + WARN_ON_ONCE(1);
> + return;
> + }

Whitespace damage..

> +
> + for (asid = 0; asid < TLB_NR_DYN_ASIDS; asid++) {
> + /* Do not need to flush the current asid */
> + if (asid == this_cpu_read(cpu_tlbstate.loaded_mm_asid))
> + continue;
> + /*
> + * Make sure the next time we go to switch to
> + * this asid, we do a flush:
> + */
> + this_cpu_write(cpu_tlbstate.ctxs[asid].ctx_id, 0);
> + }
> + this_cpu_write(cpu_tlbstate.all_other_ctxs_invalid, false);
> +}

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