From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6E9C53081CA for ; Wed, 18 Feb 2026 11:01:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771412497; cv=none; b=uYxn1XxGJHKXXKSiKPn5ZO+KJ2qWrPFvR0Z+4Gk3f8zhtXpg9xs7KAbYpMRMFyD0NGSG1D60xSAzIm7+edTl9VCItzGzr8qDJdh6qV6b2ic4xjKEsr0cpJP/XXnG26oAYD3/bsUshyi0wG5kTLmnrlXmW2RFVTciXFjA7widZo4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771412497; c=relaxed/simple; bh=BGuuST+/Iv1ZSFBKnarbpFXQl7OBzI0rO9uKaH1X0i8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DBmp/qt0YjxfQtBRm3Xlki0CjFyRzlx0yIKA9joXmlaiu6WDCppZIg4pd2hr9gHrZYyskPvv6CYNu65NP/noEyFgHqq22XSTM16z6rIvUGQ35fK/m0o8ZNSirExj9ibGMfb9bIEUnXGBcE60c5OngyTDny+BpYri5zZF9v9wFCc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OvKF2VaK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OvKF2VaK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA50AC19421; Wed, 18 Feb 2026 11:01:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771412497; bh=BGuuST+/Iv1ZSFBKnarbpFXQl7OBzI0rO9uKaH1X0i8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OvKF2VaKO2Dz6w3eX8jyUU1+okXBCC6EXvOSh0IgzZfIwS4ZUBC9lBQhKdlFnmACH vK2XShx0XzVjD7yxKoVkqcZ2NTIwHR/kWoV6LOyBIXSPe8smKmCKB0DER6+j2QqGp2 P8QQ3l31Kb3n/f/tXlVms/6eZjdkg7ImJaclnETudLInb2ulgW7i7xUhsmFtciax/H t9OHvMLLA3+NQhLJo3aYTaph2GrWcTQizaUk8QFE8VXSL1qaBVBC49So0+/sUQe9FZ 9D8GFqFQIIbo7SSjFSIw1X19E85CE9KcVVBl5r59aY/CfpbkO9ySiQah0Md1ebVS79 N9f6z95oCpZkQ== From: "David Hildenbrand (Arm)" To: stable@vger.kernel.org Cc: linux-mm@kvack.org, "David Hildenbrand (Arm)" , Jane Chu , Harry Yoo , Oscar Salvador , Jann Horn , Liu Shixin , Muchun Song , Andrew Morton , Rik van Riel , Laurence Oberman , Lance Yang , Miaohe Lin Subject: [PATCH 5.15.y 0/6] mm/hugetlb: fixes for PMD table sharing (incl. using mmu_gather) Date: Wed, 18 Feb 2026 12:01:23 +0100 Message-ID: <20260218110129.41578-1-david@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <2026012608-tulip-moisten-c6f6@gregkh> References: <2026012608-tulip-moisten-c6f6@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Backport of [1] for 5.15. Backport notes are in the individual patches. I'm also including a cleanup/fix from Miaohe that makes backporting at least a bit easier, followed by the fix from Jane. Tested on x86-64 with the original reproducer. [1] https://lore.kernel.org/linux-mm/20251223214037.580860-1-david@kernel.org/ Cc: Jane Chu Cc: Harry Yoo Cc: Oscar Salvador Cc: Jann Horn Cc: Liu Shixin Cc: Muchun Song Cc: Andrew Morton Cc: Rik van Riel Cc: Laurence Oberman Cc: Lance Yang Cc: Liu Shixin Cc: Miaohe Lin David Hildenbrand (Red Hat) (4): mm/hugetlb: fix hugetlb_pmd_shared() mm/hugetlb: fix two comments related to huge_pmd_unshare() mm/rmap: fix two comments related to huge_pmd_unshare() mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather Jane Chu (1): mm/hugetlb: fix copy_hugetlb_page_range() to use ->pt_share_count Miaohe Lin (1): mm/hugetlb: make detecting shared pte more reliable include/asm-generic/tlb.h | 77 ++++++++++++++++++++- include/linux/hugetlb.h | 17 +++-- include/linux/mm_types.h | 1 + mm/hugetlb.c | 141 +++++++++++++++++++------------------- mm/mmu_gather.c | 33 +++++++++ mm/rmap.c | 38 +++++----- 6 files changed, 210 insertions(+), 97 deletions(-) -- 2.43.0