From mboxrd@z Thu Jan 1 00:00:00 1970 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 F254E1F5852; Sun, 20 Jul 2025 11:23:01 +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=1753010582; cv=none; b=aqidygh7UPUDcVQS243ScdVwp+1v/gNbtuJoqDOQYR4c28myUYekgMYBlWr4M06bV0POi+pQqZ/WlZumMFnnM2K9+DAuEPN1HAIWkmebBsghkgFgOpPdCLxiEcriNqA57Cs5j2BMIgUR+0qp+F55BnWYzvaKm/2o1alMAksT9vo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753010582; c=relaxed/simple; bh=KMhCWNQxHtiBSE+SRTiH1ttazQpc/bbQ0gCvygEnWyg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gP4vtpTWKSaw9L1L/P/f2rjfD36pR3fcmFVq69mTCgWIcEgBvecqghbi3A0BxMcqtYsRrKTH30Q0hG/LQn+ADY+YVQByqrbhOX/SZnPOS9sI5VrhBWKZ4rATTWPei6SdH6/KXp6grkt/BVMxSSMA6J4wvrByy3xQjGL9tEkW2J0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bGijcCMZ; 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="bGijcCMZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 431ADC4CEE7; Sun, 20 Jul 2025 11:22:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753010581; bh=KMhCWNQxHtiBSE+SRTiH1ttazQpc/bbQ0gCvygEnWyg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bGijcCMZqolJB9YLEDGa287wuW+inkvhctfGLdKnfm30qpU1pNyvsbweATgcqgIVf 3Kt+2MD9SjLqO0K10s/ulg2uNwrajAx4Yjmpdha8jCxrhdY+s7kK4vjDuNV7GikjzH m/UCUaCwOzrcaOgWHWMg6dDoTeJY8589VIzTLhDXCVW3U9zwLEmdk0yMR7X+XY2Lhp sTcJjOQ3JiavUcGWzjJAyx9jHSrqKc8RIpov9JPJeot6M2VQlzugDiGjr4LTA7TyBk 9jln/ZZCNT6eJxbA1lb5UiZ6rt5Qfa9mdrHFdf28bxuT0h8mKJpsUg2RIUxCC9/kLT Xs7K1rLU6O/FA== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Andrii Nakryiko Cc: "Masami Hiramatsu (Google)" , 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 , Alan Maguire , David Laight , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Ingo Molnar Subject: [PATCHv6 perf/core 07/22] uprobes: Add do_ref_ctr argument to uprobe_write function Date: Sun, 20 Jul 2025 13:21:17 +0200 Message-ID: <20250720112133.244369-8-jolsa@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250720112133.244369-1-jolsa@kernel.org> References: <20250720112133.244369-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. Reviewed-by: Masami Hiramatsu (Google) Acked-by: Andrii Nakryiko Acked-by: Oleg Nesterov Signed-off-by: Jiri Olsa --- 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_regs *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 is_register); + uprobe_opcode_t *insn, int nbytes, uprobe_write_verify_t verify, bool is_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 */); } 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 = insn_vaddr & PAGE_MASK; struct mm_struct *mm = vma->vm_mm; @@ -538,7 +538,7 @@ int uprobe_write(struct arch_uprobe *auprobe, struct vm_area_struct *vma, } /* 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 = 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, 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); /* try collapse pmd for compound page */ -- 2.50.1