From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-118.mta0.migadu.com [91.218.175.118]) (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 292FE45A2A1 for ; Mon, 14 Sep 2026 12:30:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.118 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789389056; cv=none; b=Zuqsmk+XX5UqINVURTZKTn8htkxq1VAnL+oUl3q8nCEoUhxknf3rW2buxfnpRhpy0sjAl+RnGXEVcfUjTfVXeo/dHOa8+Y0RrwxfjFX3Ie5jy1Zl8yBOlK7mdNOUWy4j9z0E6gJ8QKGn2uqAfLRGgHvo+V1Vm/sDSmYqfBS6oEY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789389056; c=relaxed/simple; bh=QiAy/7wN1ydZlsQx7DI1Vjrn3FeWZdoFpSxlDD4vX6A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dIn5D0LkXihLZgC+BAY9ZC7JH7Cot72ASPWsLU336zn6NveAidCuMqaf6XTQZgtK+yvqGCEbroxfLEqNejeW/nsdnrmXbW8iUl4N7/+USD2nezLLTVLBZqvYFhPM9W5RtgLZYHMVOaSYr3D9BaqoU+w0SLFpnH3g9o/Gz4Vm570= 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=OAinCtuu; arc=none smtp.client-ip=91.218.175.118 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="OAinCtuu" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=QiAy/7wN1ydZlsQx7DI1Vjrn3FeWZdoFpSxlDD4vX6A=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789389048; v=1; x=1789993848; b=OAinCtuupAMpJPULjtCJAIGtBGG71/6/dhf8cIE0WOAxUZHlxw4motUaVppxuVDpasZS3YDx exGS+XGpG9xGjy5X0fn49XOnJvqbkIFZiisEuC1wUMK2z70Bd2B3r/165VonXwZ8EFmAcYk7T/S QJnoZSshB0OnbVgxCSr79Tzw= X-Envelope-To: linux-kernel@vger.kernel.org Received: by mta11.migadu.com with ESMTPS id 208b78021ed50abd; Mon, 14 Sep 2026 12:30:48 +0000 X-Mizu-Trace-ID: 208b78021ed50abd 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 , Huacai Chen Subject: [RESEND v7 03/29] loongarch: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 05:27:53 -0700 Message-ID: <20260914122950.3283997-4-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260914122950.3283997-1-usama.arif@linux.dev> References: <20260914122950.3283997-1-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. A LoongArch swap PMD is the swap PTE value plus _PAGE_HUGE, and _PAGE_SWP_EXCLUSIVE sits outside both the type and the offset field, so the PMD helpers can use the same bit. Cc: Huacai Chen Signed-off-by: Usama Arif --- arch/loongarch/include/asm/pgtable.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index cf29a4c8ac593..87fecc3a51001 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -351,6 +351,25 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte; } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + pmd_val(pmd) |= _PAGE_SWP_EXCLUSIVE; + return pmd; +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_val(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + pmd_val(pmd) &= ~_PAGE_SWP_EXCLUSIVE; + return pmd; +} +#endif + #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) -- 2.53.0-Meta