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Tue, 26 May 2020 23:46:05 -0700 (PDT) From: js1304@gmail.com X-Google-Original-From: iamjoonsoo.kim@lge.com To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@lge.com, Vlastimil Babka , Christoph Hellwig , Roman Gushchin , Mike Kravetz , Naoya Horiguchi , Michal Hocko , Joonsoo Kim Subject: [PATCH v2 07/12] mm/hugetlb: do not modify user provided gfp_mask Date: Wed, 27 May 2020 15:44:58 +0900 Message-Id: <1590561903-13186-8-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1590561903-13186-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1590561903-13186-1-git-send-email-iamjoonsoo.kim@lge.com> X-Rspamd-Queue-Id: 215298006960 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Joonsoo Kim It's not good practice to modify user input. Instead of using it to build correct gfp_mask for APIs, this patch introduces another gfp_mask field, __gfp_mask, for internal usage. Signed-off-by: Joonsoo Kim --- mm/hugetlb.c | 19 ++++++++++--------- mm/internal.h | 2 ++ 2 files changed, 12 insertions(+), 9 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index e465582..4757e72 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1068,15 +1068,15 @@ static struct page *dequeue_huge_page_nodemask(struct hstate *h, struct zoneref *z; int node = NUMA_NO_NODE; - zonelist = node_zonelist(ac->nid, ac->gfp_mask); + zonelist = node_zonelist(ac->nid, ac->__gfp_mask); retry_cpuset: cpuset_mems_cookie = read_mems_allowed_begin(); for_each_zone_zonelist_nodemask(zone, z, zonelist, - gfp_zone(ac->gfp_mask), ac->nmask) { + gfp_zone(ac->__gfp_mask), ac->nmask) { struct page *page; - if (!cpuset_zone_allowed(zone, ac->gfp_mask)) + if (!cpuset_zone_allowed(zone, ac->__gfp_mask)) continue; /* * no need to ask again on the same node. Pool is node rather than @@ -1127,8 +1127,8 @@ static struct page *dequeue_huge_page_vma(struct hstate *h, if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0) goto err; - ac.gfp_mask = htlb_alloc_mask(h); - ac.nid = huge_node(vma, address, ac.gfp_mask, &mpol, &ac.nmask); + ac.__gfp_mask = htlb_alloc_mask(h); + ac.nid = huge_node(vma, address, ac.__gfp_mask, &mpol, &ac.nmask); page = dequeue_huge_page_nodemask(h, &ac); if (page && !avoid_reserve && vma_has_reserves(vma, chg)) { @@ -1951,7 +1951,7 @@ static struct page *alloc_migrate_huge_page(struct hstate *h, if (hstate_is_gigantic(h)) return NULL; - page = alloc_fresh_huge_page(h, ac->gfp_mask, + page = alloc_fresh_huge_page(h, ac->__gfp_mask, ac->nid, ac->nmask, NULL); if (!page) return NULL; @@ -1989,9 +1989,10 @@ struct page *alloc_buddy_huge_page_with_mpol(struct hstate *h, struct page *alloc_huge_page_nodemask(struct hstate *h, struct alloc_control *ac) { - ac->gfp_mask |= htlb_alloc_mask(h); + ac->__gfp_mask = htlb_alloc_mask(h); + ac->__gfp_mask |= ac->gfp_mask; if (ac->nid == NUMA_NO_NODE) - ac->gfp_mask &= ~__GFP_THISNODE; + ac->__gfp_mask &= ~__GFP_THISNODE; spin_lock(&hugetlb_lock); if (h->free_huge_pages - h->resv_huge_pages > 0) { @@ -2010,7 +2011,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, * will not come from CMA area */ if (ac->skip_cma) - ac->gfp_mask &= ~__GFP_MOVABLE; + ac->__gfp_mask &= ~__GFP_MOVABLE; return alloc_migrate_huge_page(h, ac); } diff --git a/mm/internal.h b/mm/internal.h index 159cfd6..2dc0268 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -619,6 +619,8 @@ struct alloc_control { nodemask_t *nmask; gfp_t gfp_mask; bool skip_cma; + + gfp_t __gfp_mask; /* Used internally in API implementation */ }; #endif /* __MM_INTERNAL_H */ -- 2.7.4