From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 753AE203710; Tue, 24 Feb 2026 05:12:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771909967; cv=none; b=a1t2T6czuxg5p+YsVB8GZAqyewysfqTJc/n793OViH8hYHCp05SdW2dj0v9orA7Dl1+fBv5UgmQEOx9gAGKJgexjysn2Uq7TchP2fuDqmUJPHvLVWWKlH5vQIoSVU2YEt9QO//8KUdsV8DWwPtiHTml6FSVcjd5FqTschap0SNA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771909967; c=relaxed/simple; bh=Er8zMgmKU3694HnC0jKaQjKFf8SIa37aK6uoxd9JPGo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dp1L+5YSl3LkM9SVe5zEeXDgJH8WrqnI+i4WhXNncN6v6hAoc1bd7IR7ICZXqwxuv12nqZOoKLaasvfYdNtKAjbeDkXP7awxYuNPVdROgw5MDwUpnctBMs0cJwG+5Jo2Z52GuPRg8G0QebzJGXrBmYilSOef3DmkP/pSSGi7ET0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AA859339; Mon, 23 Feb 2026 21:12:39 -0800 (PST) Received: from a085714.blr.arm.com (a085714.arm.com [10.164.18.87]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 63A333F7BD; Mon, 23 Feb 2026 21:12:40 -0800 (PST) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org Cc: Anshuman Khandual , Catalin Marinas , Will Deacon , Ryan Roberts , Mark Rutland , Lorenzo Stoakes , Andrew Morton , David Hildenbrand , Mike Rapoport , Linu Cherian , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , linux-perf-users@vger.kernel.org Subject: [RFC V1 04/16] perf/events: Replace READ_ONCE() with standard pgtable accessors Date: Tue, 24 Feb 2026 10:41:41 +0530 Message-ID: <20260224051153.3150613-5-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260224051153.3150613-1-anshuman.khandual@arm.com> References: <20260224051153.3150613-1-anshuman.khandual@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Replace READ_ONCE() with standard page table accessors i.e pxdp_get() which anyways default into READ_ONCE() in cases where platform do not override. Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- kernel/events/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index ac70d68217b6..4ee151cd2c6d 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8422,7 +8422,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr) pte_t *ptep, pte; pgdp = pgd_offset(mm, addr); - pgd = READ_ONCE(*pgdp); + pgd = pgdp_get(pgdp); if (pgd_none(pgd)) return 0; @@ -8430,7 +8430,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr) return pgd_leaf_size(pgd); p4dp = p4d_offset_lockless(pgdp, pgd, addr); - p4d = READ_ONCE(*p4dp); + p4d = p4dp_get(p4dp); if (!p4d_present(p4d)) return 0; @@ -8438,7 +8438,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr) return p4d_leaf_size(p4d); pudp = pud_offset_lockless(p4dp, p4d, addr); - pud = READ_ONCE(*pudp); + pud = pudp_get(pudp); if (!pud_present(pud)) return 0; -- 2.43.0