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SubjectRe: [PATCH v7 03/10] mm/lru: replace pgdat lru_lock with lruvec lock
Hi Alex,

On Wed, Dec 25, 2019 at 05:04:19PM +0800, Alex Shi wrote:
> @@ -900,6 +904,29 @@ static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
> {
> return &pgdat->__lruvec;
> }
> +#define lock_page_lruvec_irq(page) \
> +({ \
> + struct pglist_data *pgdat = page_pgdat(page); \
> + spin_lock_irq(&pgdat->__lruvec.lru_lock); \
> + &pgdat->__lruvec; \
> +})
> +
> +#define lock_page_lruvec_irqsave(page, flagsp) \
> +({ \
> + struct pglist_data *pgdat = page_pgdat(page); \
> + spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp); \
> + &pgdat->__lruvec; \
> +})
> +
> +#define unlock_page_lruvec_irq(lruvec) \
> +({ \
> + spin_unlock_irq(&lruvec->lru_lock); \
> +})
> +
> +#define unlock_page_lruvec_irqrestore(lruvec, flags) \
> +({ \
> + spin_unlock_irqrestore(&lruvec->lru_lock, flags); \
> +})

Noticed this while testing your series. These are safe as inline functions, so
I think you may have gotten the wrong impression when Johannes made this point:

https://lore.kernel.org/linux-mm/20191119164448.GA396644@cmpxchg.org/

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