From nobody Mon Feb 9 03:32:03 2026 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 E178222F14D; Thu, 5 Jun 2025 13:25:19 +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=1749129921; cv=none; b=BXbHtb4TPBxu+C4DcKcTyM2/PazdxG/5qfqm31RBpMBJvRdZbMvqkBoisL1PWftRF54cSuwfjWdS5QMkOxHTBxxvVT+UE/kq/Unbo5KhSbmOOpqW4lNoioUcVW8979RvZ3AzsCJ4SZgJBpOuRASKp4x/e8Zw/Jv+II1C00qu/QU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749129921; c=relaxed/simple; bh=Ev5nJAiSMvgalMrnszs3NHHVXFevOJwzRNViANzSKV0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YajhVLHn/ulJPKjEOt5OCO+qQWX4hojP0QOkCpiy0JncaLfLOmG3EhFlWdXjnH0BxAxYpOxd8zTqBo2Ujt4nFyW+DKwRnJr1UojEHJS2MBmqWwRKm6qXlV02qq7Jw20ve282ue7edRYgS3uYqXGXCzDPuhGCIowXEmceWEBKl7Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZaE/+XN3; 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="ZaE/+XN3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E7D7C4CEF3; Thu, 5 Jun 2025 13:25:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749129919; bh=Ev5nJAiSMvgalMrnszs3NHHVXFevOJwzRNViANzSKV0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZaE/+XN3NqsAmeU62CsWGsAzj+TDdA37B1e4N8tNSqkqXL4/5wIWkuCh7WaENN8cu 3shvoADTN8XnDA6RNtQS2JvqmEYesCRnXCiz1quyjm65orvrHBOW+2PhaII85YB3Wp stgmY2/AS4x/h0/XYGbnlIji/3jdj5olCLmsMg+CXOg37f/bfluS75bcnfCuxPFO2s mI/FzyDd87gE9spIDkGqoZJfJ0hSLKKuI3xNuXtRu0nt5BWiOn5iTNbGcJRj9gRjCE FWU+hQWFLYxIH2avbUdFKZf4UeaaJcBl2BPoxve5bkJYUxijbthsaOtVaz0xJBkmIO BgAkD4fqr6Aog== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Andrii Nakryiko Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Song Liu , Yonghong Song , John Fastabend , Hao Luo , Steven Rostedt , Masami Hiramatsu , Alan Maguire , David Laight , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Ingo Molnar Subject: [PATCHv3 perf/core 07/22] uprobes: Add do_ref_ctr argument to uprobe_write function Date: Thu, 5 Jun 2025 15:23:34 +0200 Message-ID: <20250605132350.1488129-8-jolsa@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250605132350.1488129-1-jolsa@kernel.org> References: <20250605132350.1488129-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Making update_ref_ctr call in uprobe_write conditional based on do_ref_ctr argument. This way we can use uprobe_write for instruction update without doing ref_ctr_offset update. Acked-by: Oleg Nesterov Signed-off-by: Jiri Olsa Reviewed-by: Masami Hiramatsu (Google) --- include/linux/uprobes.h | 2 +- kernel/events/uprobes.c | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 518b26756469..5080619560d4 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -200,7 +200,7 @@ extern unsigned long uprobe_get_trap_addr(struct pt_reg= s *regs); extern int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area= _struct *vma, unsigned long vaddr, uprobe_opcode_t, bool is_register); extern int uprobe_write(struct arch_uprobe *auprobe, struct vm_area_struct= *vma, const unsigned long opcode_vaddr, - uprobe_opcode_t *insn, int nbytes, uprobe_write_verify_t verify, bool i= s_register); + uprobe_opcode_t *insn, int nbytes, uprobe_write_verify_t verify, bool i= s_register, bool do_update_ref_ctr); extern struct uprobe *uprobe_register(struct inode *inode, loff_t offset, = loff_t ref_ctr_offset, struct uprobe_consumer *uc); extern int uprobe_apply(struct uprobe *uprobe, struct uprobe_consumer *uc,= bool); extern void uprobe_unregister_nosync(struct uprobe *uprobe, struct uprobe_= consumer *uc); diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 1e5dc3b30707..6795b8d82b9c 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -492,12 +492,12 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, = struct vm_area_struct *vma, bool is_register) { return uprobe_write(auprobe, vma, opcode_vaddr, &opcode, UPROBE_SWBP_INSN= _SIZE, - verify_opcode, is_register); + verify_opcode, is_register, true /* do_update_ref_ctr */); } =20 int uprobe_write(struct arch_uprobe *auprobe, struct vm_area_struct *vma, const unsigned long insn_vaddr, uprobe_opcode_t *insn, int nbytes, - uprobe_write_verify_t verify, bool is_register) + uprobe_write_verify_t verify, bool is_register, bool do_update_ref_ctr) { const unsigned long vaddr =3D insn_vaddr & PAGE_MASK; struct mm_struct *mm =3D vma->vm_mm; @@ -538,7 +538,7 @@ int uprobe_write(struct arch_uprobe *auprobe, struct vm= _area_struct *vma, } =20 /* We are going to replace instruction, update ref_ctr. */ - if (!ref_ctr_updated && uprobe->ref_ctr_offset) { + if (do_update_ref_ctr && !ref_ctr_updated && uprobe->ref_ctr_offset) { ret =3D update_ref_ctr(uprobe, mm, is_register ? 1 : -1); if (ret) { folio_put(folio); @@ -590,7 +590,7 @@ int uprobe_write(struct arch_uprobe *auprobe, struct vm= _area_struct *vma, =20 out: /* Revert back reference counter if instruction update failed. */ - if (ret < 0 && ref_ctr_updated) + if (do_update_ref_ctr && ret < 0 && ref_ctr_updated) update_ref_ctr(uprobe, mm, is_register ? -1 : 1); =20 /* try collapse pmd for compound page */ --=20 2.49.0