From nobody Sat Jul 25 17:35:04 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B7C3A311592 for ; Wed, 15 Jul 2026 09:44:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784108669; cv=none; b=dchvkgON8oQy6AiHBH2+99q+Qfen9LVFa+rCXfctr9epF36fbLCavF6SAMI4wQddOmp2u/+zS+afRcsG9ETb0bVHWte9/HsjQ4Ou2jP62DTsOg+PUUIQB3BckE8YEZH/JB2kv7nbHA7fcNHzAufEY/1fMIG84TOlAVXm9nqX3iQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784108669; c=relaxed/simple; bh=du5E4z45/qCW35/KeznfOnWR4N78NCd4noqT0tDju84=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fRcxBcR1nz0ctO/pUZ9FYtw9MmGJluzC4PTYjpzAfOnMWBbhP0LQS7kAnJUo8I1sfDzMBkbCAgvFoLUjsIPllrknmwR9l2Fv496U6+OS6GOHKEHfFwNg8W0HUAC+luNG2Fz+btIxMCDNqGz4CX6Gf8z4Gf8rScZhG4MLfdI/Ajs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: bde4fad6803111f1aa26b74ffac11d73-20260715 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM, HR_SJ_PHRASE HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT, HR_TO_NO_NAME IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_EXISTED, SN_EXISTED SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD, CIE_GOOD_SPF GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD, ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:5a2037c1-6738-4676-900e-3b5ddde8d270,IP:10, URL:0,TC:0,Content:0,EDM:25,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:35 X-CID-INFO: VERSION:1.3.12,REQID:5a2037c1-6738-4676-900e-3b5ddde8d270,IP:10,UR L:0,TC:0,Content:0,EDM:25,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:35 X-CID-META: VersionHash:e7bac3a,CLOUDID:fc6fa331a125bfb1bdd9d4ea9932b593,BulkI D:260715174415TR37GZDR,BulkQuantity:0,Recheck:0,SF:17|19|66|78|102|127|865 |898,TC:nil,Content:0|15|50,EDM:5,IP:-2,URL:0,File:nil,RT:nil,Bulk:nil,QS: nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,AR C:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_FAS,TF_CID_SPAM_FSD,TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: bde4fad6803111f1aa26b74ffac11d73-20260715 X-User: husong@kylinos.cn Received: from ctao-book.. [(223.70.159.239)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 66821565; Wed, 15 Jul 2026 17:44:15 +0800 From: Song Hu To: chenhuacai@kernel.org Cc: kernel@xen0n.name, jiaxun.yang@flygoat.com, cuitao@kylinos.cn, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, cui.tao@linux.dev, Song Hu Subject: [PATCH] LoongArch: mm: drop redundant flush_tlb_all() from set_pmd_at() Date: Wed, 15 Jul 2026 17:43:59 +0800 Message-ID: <20260715094359.1452138-1-husong@kylinos.cn> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" set_pmd_at() unconditionally calls flush_tlb_all(), a synchronous all-CPU IPI that flushes the entire TLB and blocks until every CPU finishes. It runs on every PMD installation, and is the only LoongArch setter that flushes -- set_pte(), set_pud() and set_p4d() do a plain store. The flush is unnecessary: set_p*_at() only writes the entry, and every caller already invalidates. vmemmap_set_pmd() writes a pmd_none() slot, and the THP, rmap, migration, mremap and NUMA-hinting paths all pair the write with pmdp_invalidate(), pmdp_huge_clear_flush() or flush_tlb_range(). Drop the call, and the now-unused include. Fixes: 09cfefb7fa70c ("LoongArch: Add memory management") Co-developed-by: Tao Cui Signed-off-by: Tao Cui Signed-off-by: Song Hu --- arch/loongarch/mm/pgtable.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/loongarch/mm/pgtable.c b/arch/loongarch/mm/pgtable.c index 4ee188e38fed..5bff95e3f375 100644 --- a/arch/loongarch/mm/pgtable.c +++ b/arch/loongarch/mm/pgtable.c @@ -8,7 +8,6 @@ #include #include #include -#include =20 struct page *dmw_virt_to_page(unsigned long kaddr) { @@ -140,7 +139,6 @@ void set_pmd_at(struct mm_struct *mm, unsigned long add= r, pmd_t *pmdp, pmd_t pmd) { WRITE_ONCE(*pmdp, pmd); - flush_tlb_all(); } =20 void __init pagetable_init(void) --=20 2.43.0