linux-kernel - Re: [PATCH 2/2] s390/mm: use ipte range to invalidate multiple page table entries

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Message-ID: <014601d1d73b$5a3c0420$0eb40c60$@alibaba-inc.com>
Date:	Wed, 06 Jul 2016 12:03:28 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Martin Schwidefsky'" <schwidefsky@...ibm.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH 2/2] s390/mm: use ipte range to invalidate multiple page table entries

> 
> +void ptep_invalidate_range(struct mm_struct *mm, unsigned long start,
> +			   unsigned long end, pte_t *ptep)
> +{
> +	unsigned long nr;
> +
> +	if (!MACHINE_HAS_IPTE_RANGE || mm_has_pgste(mm))
> +		return;
> +	preempt_disable();
> +	nr = (end - start) >> PAGE_SHIFT;
> +	/* If the flush is likely to be local skip the ipte range */
> +	if (nr && !cpumask_equal(mm_cpumask(mm),
> +				 cpumask_of(smp_processor_id())))

s/smp/raw_smp/ to avoid adding schedule entry with page table
lock held?

> +		__ptep_ipte_range(start, nr - 1, ptep);
> +	preempt_enable();
> +}
> +EXPORT_SYMBOL(ptep_invalidate_range);
> +

thanks
Hillf