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Date: Thu, 3 Dec 2015 08:53:21 -0600 (CST) From: Christoph Lameter <cl@...ux.com> To: Geliang Tang <geliangtang@....com> cc: Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] mm/slab.c: use list_{empty_careful,last_entry} in drain_freelist On Thu, 3 Dec 2015, Geliang Tang wrote: > while (nr_freed < tofree && !list_empty(&n->slabs_free)) { > > spin_lock_irq(&n->list_lock); > - p = n->slabs_free.prev; > - if (p == &n->slabs_free) { > + if (list_empty_careful(&n->slabs_free)) { We have taken the lock. Why do we need to be "careful"? list_empty() shoudl work right? > spin_unlock_irq(&n->list_lock); > goto out; > } > > - page = list_entry(p, struct page, lru); > + page = list_last_entry(&n->slabs_free, struct page, lru); last??? Would the the other new function that returns NULL on the empty list or the pointer not be useful here too and save some code? This patch seems to make it difficult to understand the code. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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