From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67640C433B4 for ; Wed, 5 May 2021 01:33:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A096613EC for ; Wed, 5 May 2021 01:33:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231931AbhEEBeP (ORCPT ); Tue, 4 May 2021 21:34:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:37230 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231925AbhEEBeO (ORCPT ); Tue, 4 May 2021 21:34:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 58E36613E4; Wed, 5 May 2021 01:33:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1620178397; bh=qgZsKn4b3HobiV8z2CTAOqzi1yT5j+ZAk1iu+6nMwcs=; h=Date:From:To:Subject:In-Reply-To:From; b=owBpKrS+LawbcGZva/mrvl1Hjn0w7xh6xscJlCLGyxscWIDVFKPVjAbQ+dEf2kYUc IEmM1uNuSua4t5rKwuTKUkxwVWRgZaKIeTZiS9JMzomQw2JplnTx5WMx9GYrDwtZ3A W2ZonpDX8VIN18NtAs+fn5wkQ16MAtd9HR+0Q5GU= Date: Tue, 04 May 2021 18:33:16 -0700 From: Andrew Morton To: akpm@linux-foundation.org, linmiaohe@huawei.com, linux-mm@kvack.org, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 010/143] mm/hugetlb: remove redundant reservation check condition in alloc_huge_page() Message-ID: <20210505013316.omcrg4PPG%akpm@linux-foundation.org> In-Reply-To: <20210504183219.a3cc46aee4013d77402276c5@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Miaohe Lin Subject: mm/hugetlb: remove redundant reservation check condition in alloc_huge_page() vma_resv_map(vma) checks if a reserve map is associated with the vma. The routine vma_needs_reservation() will check vma_resv_map(vma) and return 1 if no reserv map is present. map_chg is set to the return value of vma_needs_reservation(). Therefore, !vma_resv_map(vma) is redundant in the expression: map_chg || avoid_reserve || !vma_resv_map(vma); Remove the redundant check. [Thanks Mike Kravetz for reshaping this commit message!] Link: https://lkml.kernel.org/r/20210301104726.45159-1-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Reviewed-by: Mike Kravetz Signed-off-by: Andrew Morton --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/hugetlb.c~mm-hugetlb-remove-redundant-reservation-check-condition-in-alloc_huge_page +++ a/mm/hugetlb.c @@ -2316,7 +2316,7 @@ struct page *alloc_huge_page(struct vm_a /* If this allocation is not consuming a reservation, charge it now. */ - deferred_reserve = map_chg || avoid_reserve || !vma_resv_map(vma); + deferred_reserve = map_chg || avoid_reserve; if (deferred_reserve) { ret = hugetlb_cgroup_charge_cgroup_rsvd( idx, pages_per_huge_page(h), &h_cg); _