mm: memcg: remove unneeded checks from newpage_charge()
All callsites pass in freshly allocated pages and a valid mm. As a result, all checks pertaining to the page's mapcount, page->mapping or the fallback to init_mm are unneeded. Signed-off-by: Johannes Weiner <jweiner@redhat.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -2748,17 +2748,9 @@ int mem_cgroup_newpage_charge(struct page *page,
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{
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if (mem_cgroup_disabled())
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return 0;
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/*
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* If already mapped, we don't have to account.
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* If page cache, page->mapping has address_space.
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* But page->mapping may have out-of-use anon_vma pointer,
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* detecit it by PageAnon() check. newly-mapped-anon's page->mapping
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* is NULL.
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*/
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if (page_mapped(page) || (page->mapping && !PageAnon(page)))
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return 0;
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if (unlikely(!mm))
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mm = &init_mm;
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VM_BUG_ON(page_mapped(page));
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VM_BUG_ON(page->mapping && !PageAnon(page));
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VM_BUG_ON(!mm);
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return mem_cgroup_charge_common(page, mm, gfp_mask,
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MEM_CGROUP_CHARGE_TYPE_MAPPED);
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}
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