From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D4BC8CF256D for ; Thu, 20 Nov 2025 04:20:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=KMH+Nr683h32/qfZF0wJKh9aeXIhv9TFt5jgxVteD+E=; b=PT7QlSdWopQMfS YUjK3WO5GT+tiZPzae4Ymkde9LmqE8BoeWJ4h4xhelBaQE0c27sksNoLouL+MkwyMak5xnytVtpSB 6VoDSlP+4kb1nEawW577cX764pfhRZOLirbnl2L2UkuXC2zO/nsqaJjNy2xjnSnV/w/3uZv4KmUKH /VWVpPgnb6ZJc4h+fxFQOYdXmIP7Ypc+kqT8eSfvB2QeBim0AbzOQyi+raHDkgMxsivfd7Rsh3Z4c dmuRStTHDbpzxOrQRywtLjbeRuWgfxqzvzwxeFuVx+Af34xa4cPNgFFbsZiakdWzd3rBzpkqsRaJb m82Q4+ZQSO4LpImTF7CQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLw9c-000000067lC-3yC1; Thu, 20 Nov 2025 04:20:20 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLw9a-000000067k9-23Ip for linux-riscv@lists.infradead.org; Thu, 20 Nov 2025 04:20:19 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id E6CDD40A10 for ; Thu, 20 Nov 2025 04:20:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE4ADC4CEF1 for ; Thu, 20 Nov 2025 04:20:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763612415; bh=zcNBGYq266uucCi/v8bKlwe5spwZDfe/RzSgu6RUk8Q=; h=From:To:Subject:Date:In-Reply-To:References:From; b=tDXrcuLfge8jkbSBEOkYQGBI/EmNaI8drJ7LRSIsMlojR//KbPs4L+Ire1oMSdABJ qC1XFLQ90S1FobpqwyUBjSiewHAlMxoFULT3Onjem7SsycUDevkQatg/hIj6fKpviU 6NCtQUkBCwVSfhPfVyHviyNGO4/j7cmsgONCe2GtTjkbtqIwx+UyTvZS/zMQ0+XKug 0r7zXIAa5E/k9KReTzaCUBvCDOX6efDVEy/bnZCWPHrRWgwNzk0E3SLoMYG2WiUudG Ms/hAggY8lrZOZVd0EfU4kNquthUcnW2cwVAK4XIvA5HzsCwC+Wz9dWlVmu9g+4/uz az9re8kE1aW5g== From: Paul Walmsley To: linux-riscv@lists.infradead.org Subject: [PATCH 2/3] riscv: mm: ptep_get_and_clear(): avoid atomic ops when !CONFIG_SMP Date: Wed, 19 Nov 2025 21:18:29 -0700 Message-ID: <20251120042001.1766011-3-pjw@kernel.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251120042001.1766011-1-pjw@kernel.org> References: <20251120042001.1766011-1-pjw@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251119_202018_571031_FFEEB032 X-CRM114-Status: UNSURE ( 7.65 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org When !CONFIG_SMP, there's no need for atomic operations in ptep_get_and_clear(), so, similar to x86, let's not use atomics in this case. Cc: Alexandre Ghiti Signed-off-by: Paul Walmsley --- arch/riscv/include/asm/pgtable.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 64a2197e6d97..e1610d031199 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -590,7 +590,13 @@ extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long a static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long address, pte_t *ptep) { +#ifdef CONFIG_SMP pte_t pte = __pte(atomic_long_xchg((atomic_long_t *)ptep, 0)); +#else + pte_t pte = *ptep; + + set_pte(ptep, __pte(0)); +#endif page_table_check_pte_clear(mm, pte); -- 2.48.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv