From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f69.google.com (mail-pj1-f69.google.com [209.85.216.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC97525F99F for ; Sat, 3 Oct 2026 00:21:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790986899; cv=none; b=VMnr0M1GuvVwv2ETtAwVvOJ4x5r5gG79hNJYwDe7MS/GTTpT75wkI13Q1cc/w5BvVMg4vTB66cSv1A87SVQRcFT1n76KXkAUD4/b3zrFjINPgDZq9tNyyKLR/NEQ0zQ5QtI51rZJkWALp06MVDe1cxFcfdT5YYAuwlv9HuS2a6g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790986899; c=relaxed/simple; bh=hWiR0FWkr16tFUuqmYLUUy9gVKRKCZdyCkACieXQ5G8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=OPsESIVwtT8JBqsdpNZPtwZrBShPNY6qi8k/EFXcE4TvwYWNBbACPX3oiO+0fY6Ra7OWlFi372FsqNcsbDnyeWOUqzFAkunmHEmqOi093uHOwiFhDzvvp8dSAoi1TBZq9TffTe4uTpUrZnDJA0A4zmW+wg7d1JqLhNZmsU5RQng= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jthoughton.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=PeR/g5Zv; arc=none smtp.client-ip=209.85.216.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jthoughton.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="PeR/g5Zv" Received: by mail-pj1-f69.google.com with SMTP id 98e67ed59e1d1-3a4a0017549so118894a91.3 for ; Fri, 02 Oct 2026 17:21:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1790986897; x=1791591697; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=93aW5kJ7TuXndYGEWNCSD+XJA7ltxFbIps3WQL+8iZc=; b=PeR/g5ZvQk563na3RFm6Ucd/T1vPFtVE2Bc+9/1Yqbbl1Meo8hFws7nSLSTJIUbGPK EzGE5hpCjWDl7yfj4yQ2m/9DsDbCGniuvUjz0X8WpMA9WnSA15Aplm7zV9DSbogmi2eN pyJtx0zl0WHRmiy9qdZISwhKP4ABSDj3v0EjTu2rlEjlL1DXBFtss9DV83gb4WJyHfaj n2PsgLSkRsOkPP0t8voTVcOZYkEhDNMwKCrE7+brxrOQEoLgZTbry3BBeysbBrjyXnJx 714nce9P8dHXBB6FpsCfAlq2pyiewPzGH2Y0nVOop+aI+yHvIcaKBD+91i/EotdXrU76 wQBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790986897; x=1791591697; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=93aW5kJ7TuXndYGEWNCSD+XJA7ltxFbIps3WQL+8iZc=; b=CMsBtwKcU+g+CqujkWSkbK0M4MHn1UNbhjuIvPMmPeMfXk5H9qI2AtA39hVyeYE95c yrL1dQ/F4wwmnP7vj/RhfKTrZsTWv83/vCWFU30i7ETI74MUZvFmGURh8/G69Hc5CXw0 vR5z4y/ShOIYkC10QaeL6LiqxScJha+4nShsR2wfDjwmYFOg6vODFX/nacfq2/O6bKkL GYew3kJWPhlNZhuThojCvEmRsaaoKBX8ZMnr/9Ab8O2sV5eu6pvX6Sda+7Qk1nJHOMab me/RtraoHgseX6PtaX4ytuhFgAZZK+sBE4dmbqXFSFYTOqlz1zEwgrBZGt0ydovF51M8 GV8w== X-Forwarded-Encrypted: i=1; AKwUvBwgVsqjrevp8C36buaQBrarZ4NsgKhSw8/a7rOjcv3T+kKLTwb7gk8fbpgAaP7/gvBzr+IHZ7pf9jci02k=@vger.kernel.org X-Gm-Message-State: AFq9FYIG02BmrfD4oT66wNuPZwSLQuYwkRFpAbKwml5wgFkG+aB2Q/JA qCxdDSGJinKNNsM8Cba+qgg5wRReLfvND1QFFQkTXwfBTEsH5GDo48jBQxD4SAm0lJHPU6iwj2X EobsLWbMc3Xo00bUoJh8AmQ== X-Received: from pjbfh14.prod.google.com ([2002:a17:90b:34e:b0:3a0:6f00:2a50]) (user=jthoughton job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3d86:b0:39e:6c68:c77b with SMTP id 98e67ed59e1d1-3a6ce83b91emr4273665a91.49.1790986896998; Fri, 02 Oct 2026 17:21:36 -0700 (PDT) Date: Sat, 3 Oct 2026 00:21:06 +0000 In-Reply-To: <20261003002123.505555-1-jthoughton@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20261003002123.505555-1-jthoughton@google.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20261003002123.505555-4-jthoughton@google.com> Subject: [PATCH v2 03/20] hugetlb_vmemmap: Always flush TLB if needed upon PTE remapping From: James Houghton To: Will Deacon , Catalin Marinas , Muchun Song , Oscar Salvador , Andrew Morton Cc: Nikos Nikoleris , Linu Cherian , Mark Rutland , David Hildenbrand , Ryan Roberts , Nanyong Sun , Yu Zhao , Frank van der Linden , David Rientjes , James Houghton , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" vmemmap_remap_range() can potentially leave the vmemmap in a partially optimized state. In this case, a TLB flush should be done if the walk caller asked for it, even if the optimization was not fully applied. A follow-up patch will more completely deal with partially-optimized folios. Signed-off-by: James Houghton --- mm/hugetlb_vmemmap.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 0057fa2a16a8..1a2645c382ba 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -163,13 +163,11 @@ static int vmemmap_remap_range(unsigned long start, unsigned long end, ret = walk_kernel_page_table_range(start, end, &vmemmap_remap_ops, NULL, walk); mmap_read_unlock(&init_mm); - if (ret) - return ret; if (walk->remap_pte && !(walk->flags & VMEMMAP_REMAP_NO_TLB_FLUSH)) flush_tlb_kernel_range(start, end); - return 0; + return ret; } /* -- 2.56.0.rc1.315.gc6ed9934b7-goog