From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-68.mta0.migadu.com [91.218.175.68]) (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 4529547253A for ; Mon, 14 Sep 2026 11:43:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.68 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789386231; cv=none; b=dW8D4PCnjtkIjtW2E4NMPQuPD3d18V/7193G8Xu2QrdIwBAOXobpPHcOBV3nv6ZfAqMotRsC5yJiD477pR7m2IjgsFAOrfcgFtNpMXT6yBjMFAl5Tpo4f2E9AvBxFb+BHVI5ef1rWM0KMG3Ib91V+hDuxCXuzeV8D08zspxtyMA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789386231; c=relaxed/simple; bh=BtQeHE2SZzfUtIrg0bS6PVLMNQTg1JxKJHlqS6nP29w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NI6+P2btvMh6lSqzJ7nh4W3wrfWs02L/K37cy8hieFiHLgalN9OWjqEazbQp6VIIrJQsXNu+zvBCK2fRHleHwRZOVIIhDJmPx3msqqNBsj+bKOgsUlq03NAV21+DFSoKy87HPxhSHlRAJHeVEUF7aLAdB4gnADaAoXfxkUbkaSA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=mIEWS7Dy; arc=none smtp.client-ip=91.218.175.68 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="mIEWS7Dy" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=BtQeHE2SZzfUtIrg0bS6PVLMNQTg1JxKJHlqS6nP29w=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789386228; v=1; x=1789991028; b=mIEWS7DyI1HdBqd/B705U9Wj33XGUsvSw68vua1JedC2RDHy5PMVlkOqsKsSaQV/Uk6WP6Rh ngqIjQTCecZMPwCFSl+E3CgpcLAOS8cTxcJMGTZ05gCN/wrIngCKU9qse18Hw9zjlNRFvthXvif scBfxg5hIHRkp51mzpPAYsc4= X-Envelope-To: linux-kernel@vger.kernel.org Received: by mta10.migadu.com with ESMTPS id 3c083accddd22eea; Mon, 14 Sep 2026 11:43:48 +0000 X-Mizu-Trace-ID: 3c083accddd22eea X-Migadu-Flow: FLOW_OUT From: Usama Arif To: Andrew Morton , david@kernel.org, chrisl@kernel.org, kasong@tencent.com, ljs@kernel.org, ziy@nvidia.com, linux-mm@kvack.org Cc: ying.huang@linux.alibaba.com, Baoquan He , willy@infradead.org, youngjun.park@lge.com, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, alex@ghiti.fr, kas@kernel.org, baohua@kernel.org, dev.jain@arm.com, baolin.wang@linux.alibaba.com, Nico Pache , Liam R. Howlett , ryan.roberts@arm.com, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, yosry@kernel.org, qi.zheng@linux.dev, luizcap@redhat.com, kernel-team@meta.com, Usama Arif , Madhavan Srinivasan Subject: [PATCH v7 04/29] powerpc: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 04:41:56 -0700 Message-ID: <20260914114320.12988-5-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260914114320.12988-1-usama.arif@linux.dev> References: <20260914114320.12988-1-usama.arif@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A later patch keeps a PMD-mapped anonymous THP mapped by a PMD across the swap round-trip, so PG_anon_exclusive now has to survive in a swap PMD and not just in a swap PTE. book3s64 builds a swap PMD by running the PTE encoding over pmd_pte(), so the PMD helpers use the same _PAGE_SWP_EXCLUSIVE bit. It is also the only powerpc variant that selects ARCH_HAS_PMD_SOFTLEAVES, via PPC_THP. Cc: Madhavan Srinivasan Signed-off-by: Usama Arif --- arch/powerpc/include/asm/book3s/64/pgtable.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index dff8790a047db..28943ef3c1c80 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -699,6 +699,23 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SWP_EXCLUSIVE)); } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + return __pmd_raw(pmd_raw(pmd) | cpu_to_be64(_PAGE_SWP_EXCLUSIVE)); +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_SWP_EXCLUSIVE)); +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + return __pmd_raw(pmd_raw(pmd) & cpu_to_be64(~_PAGE_SWP_EXCLUSIVE)); +} +#endif + static inline bool check_pte_access(unsigned long access, unsigned long ptev) { /* -- 2.53.0-Meta