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Fri, 23 May 2025 01:58:37 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGGupqC+46X0tt6Ygg6tbBTVVOo7BQlw5aLij8Bq0jPcx2TjqKILidIf2WS35eedcHMuDdsdg== X-Received: by 2002:a05:6512:3083:b0:552:31c:d27f with SMTP id 2adb3069b0e04-55216e18aa5mr550242e87.6.1747990716968; Fri, 23 May 2025 01:58:36 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([45.145.92.2]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-550e702e03dsm3786008e87.195.2025.05.23.01.58.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 May 2025 01:58:36 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id D7C101AA3B8A; Fri, 23 May 2025 10:58:33 +0200 (CEST) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Byungchul Park , willy@infradead.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel_team@skhynix.com, kuba@kernel.org, almasrymina@google.com, ilias.apalodimas@linaro.org, harry.yoo@oracle.com, hawk@kernel.org, akpm@linux-foundation.org, davem@davemloft.net, john.fastabend@gmail.com, andrew+netdev@lunn.ch, asml.silence@gmail.com, tariqt@nvidia.com, edumazet@google.com, pabeni@redhat.com, saeedm@nvidia.com, leon@kernel.org, ast@kernel.org, daniel@iogearbox.net, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, horms@kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, vishal.moola@gmail.com Subject: Re: [PATCH 12/18] page_pool: use netmem APIs to access page->pp_magic in page_pool_page_is_pp() In-Reply-To: <20250523032609.16334-13-byungchul@sk.com> References: <20250523032609.16334-1-byungchul@sk.com> <20250523032609.16334-13-byungchul@sk.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Fri, 23 May 2025 10:58:33 +0200 Message-ID: <87ecwfn1om.fsf@toke.dk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Byungchul Park writes: > To simplify struct page, the effort to seperate its own descriptor from > struct page is required and the work for page pool is on going. > > To achieve that, all the code should avoid accessing page pool members > of struct page directly, but use safe APIs for the purpose. > > Use netmem_is_pp() instead of directly accessing page->pp_magic in > page_pool_page_is_pp(). > > Signed-off-by: Byungchul Park > --- > include/linux/mm.h | 5 +---- > net/core/page_pool.c | 5 +++++ > 2 files changed, 6 insertions(+), 4 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 8dc012e84033..3f7c80fb73ce 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -4312,10 +4312,7 @@ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status); > #define PP_MAGIC_MASK ~(PP_DMA_INDEX_MASK | 0x3UL) > > #ifdef CONFIG_PAGE_POOL > -static inline bool page_pool_page_is_pp(struct page *page) > -{ > - return (page->pp_magic & PP_MAGIC_MASK) == PP_SIGNATURE; > -} > +bool page_pool_page_is_pp(struct page *page); Here you're turning an inline function into a function call, which has performance implications. Please try to avoid that. -Toke