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V" , Joonsoo Kim , stable@vger.kernel.org Subject: Re: [PATCH] mm/page_alloc: fix memalloc_nocma_{save/restore} APIs Message-ID: <20200721120533.GD15516@casper.infradead.org> References: <1595302129-23895-1-git-send-email-iamjoonsoo.kim@lge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1595302129-23895-1-git-send-email-iamjoonsoo.kim@lge.com> X-Rspamd-Queue-Id: 4B0D718033232 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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: On Tue, Jul 21, 2020 at 12:28:49PM +0900, js1304@gmail.com wrote: > +static inline unsigned int current_alloc_flags(gfp_t gfp_mask, > + unsigned int alloc_flags) > +{ > +#ifdef CONFIG_CMA > + unsigned int pflags = current->flags; > + > + if (!(pflags & PF_MEMALLOC_NOCMA) && > + gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) > + alloc_flags |= ALLOC_CMA; Please don't indent by one tab when splitting a line because it looks like the second line and third line are part of the same block. Either do this: if (!(pflags & PF_MEMALLOC_NOCMA) && gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) alloc_flags |= ALLOC_CMA; or this: if (!(pflags & PF_MEMALLOC_NOCMA) && gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) alloc_flags |= ALLOC_CMA; > @@ -4619,8 +4631,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, > wake_all_kswapds(order, gfp_mask, ac); > > reserve_flags = __gfp_pfmemalloc_flags(gfp_mask); > - if (reserve_flags) > + if (reserve_flags) { > alloc_flags = reserve_flags; > + alloc_flags = current_alloc_flags(gfp_mask, alloc_flags); > + } Is this right? Shouldn't you be passing reserve_flags to current_alloc_flags() here? Also, there's no need to add { } here.