From nobody Sat Jul 25 06:09:54 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 9CEEA2C2360 for ; Fri, 17 Jul 2026 02:38:01 +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=1784255883; cv=none; b=Vy/05gQvdofAYbbJ7lifuwuLBGvGoiBHtt1QY09/lyE3LmhBmIM9o1U5IIkvIBf+04jLz8g+Bm6Hv9/zZfOlPCzREirYrswoQDgXQXJFINwf2JeKFXH9wiT1pUNILHjlLDQDR29PADRSR9ZCB31iBUYVEr46H8oCIr4ysF9qHhI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784255883; c=relaxed/simple; bh=v3GfzYf6+JjVrBSoaxOkHFo7f94f1turmKkpt4OKwPM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=iiLYNIXtZB951dBwVrTvwiTmpRaBbqfe+j3QTiJVZ5qqe200g1WFogFDsZhrtXjVn7l3GNsFpLqaTDh21d0qDI0e02VmVCJpTk9IbJ/lln917PXc1wVoMD00+SwwuwRBa7UhvvtbhhyUCfNdBgr2D+6k6Ax7UL7HnZHijBXlQCg= 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: 8466d362818811f1aa26b74ffac11d73-20260717 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_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:e894a6c8-c070-49d0-8387-ca5954fc4d4e,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:e894a6c8-c070-49d0-8387-ca5954fc4d4e,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:c105ae29217813d9f268c0c7b2fe1311,BulkI D:260717103758D6VKOR0Z,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_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 8466d362818811f1aa26b74ffac11d73-20260717 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 1434908498; Fri, 17 Jul 2026 10:37:56 +0800 From: Song Hu To: chenhuacai@kernel.org Cc: kernel@xen0n.name, yangtiezhu@loongson.cn, jiaxun.yang@flygoat.com, arnd@arndb.de, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, Song Hu Subject: [PATCH] LoongArch: warn when per-CPU TLB vector allocation fails Date: Fri, 17 Jul 2026 10:37:12 +0800 Message-ID: <20260717023712.1989650-1-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" On a secondary CPU, setup_tlb_handler() allocates a NUMA-local page for the per-CPU TLB exception vectors and silently returns if the allocation fails. The CPU keeps running on the shared vectors that configure_exception_vector() installed earlier in per_cpu_trap_init(), losing NUMA locality with nothing logged. Warn so the fallback is observable. Signed-off-by: Song Hu --- arch/loongarch/mm/tlb.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c index aaf7d685cc2a..e5220653279c 100644 --- a/arch/loongarch/mm/tlb.c +++ b/arch/loongarch/mm/tlb.c @@ -297,8 +297,11 @@ static void setup_tlb_handler(int cpu) return; =20 page =3D alloc_pages_node(cpu_to_node(cpu), GFP_ATOMIC, get_order(vec_sz= )); - if (!page) + if (!page) { + pr_warn("CPU%d: TLB vector allocation failed; " + "using shared vectors\n", cpu); return; + } =20 addr =3D page_address(page); pcpu_handlers[cpu] =3D (unsigned long)addr; --=20 2.43.0