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 89AB6347FE1; Tue, 16 Dec 2025 11:42:41 +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=1765885361; cv=none; b=eBZ2vqaLicIoTvM6n6iCCQnCd+0Hi62fIGXPFg8RVLQcpMHDE1j2eMnSJkGWSxLJaAAWQiv37b1Cc+dVUnr4WKGDPfy7kReEN2z6WmPBWTX1EEwZl7Z/xmqvG4uuK2w3T7fNNt/D88r4cxQqIQibKU2rX7N0K+6V/J9rpwUyG4k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765885361; c=relaxed/simple; bh=9mzBrs34XE1SKfNunZVPia5ATJPRBVg1gB/Ufr3sTjg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SperwnaKzM4csT9n7LUBXJ1NL+n54oSlxDHLMNm72/EesLakf9q8U6TFWvrveTfqmDRJIO6B0u+Htlv5p5XW2dfkCckm6VVIaxNRWw0AaZn4fjE8bE3OT+5xiD3IjjAuHJ0XWh0N9zcyffhDjF6IwwTIYlepjL9vGwIC/emW/UA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GXw8d3dl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="GXw8d3dl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AFEA4C4CEF5; Tue, 16 Dec 2025 11:42:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1765885361; bh=9mzBrs34XE1SKfNunZVPia5ATJPRBVg1gB/Ufr3sTjg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GXw8d3dlXT90SfOZPlfJwn827hQMsMFNOuckf1DSmO6LMPr7aZuGOfRQ2CN8cCIRX B003stX85zfgvOE5+uUc6GBd0dioPIs8E9rR/0mLt69kQHpFrEOOcGvVt85K0ATdHp Pm0GkWQTs39lPvLWTqF60/nGUhrjQK2FszDMEWpo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Josh Poimboeuf , "Steven Rostedt (Google)" , "Peter Zijlstra (Intel)" , Namhyung Kim , Alexei Starovoitov , Sasha Levin Subject: [PATCH 6.17 116/507] perf: Remove get_perf_callchain() init_nr argument Date: Tue, 16 Dec 2025 12:09:17 +0100 Message-ID: <20251216111349.736728381@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251216111345.522190956@linuxfoundation.org> References: <20251216111345.522190956@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Josh Poimboeuf [ Upstream commit e649bcda25b5ae1a30a182cc450f928a0b282c93 ] The 'init_nr' argument has double duty: it's used to initialize both the number of contexts and the number of stack entries. That's confusing and the callers always pass zero anyway. Hard code the zero. Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Signed-off-by: Peter Zijlstra (Intel) Acked-by: Namhyung Kim Acked-by: Alexei Starovoitov Link: https://lore.kernel.org/r/20250820180428.259565081@kernel.org Stable-dep-of: 23f852daa4ba ("bpf: Fix stackmap overflow check in __bpf_get_stackid()") Signed-off-by: Sasha Levin --- include/linux/perf_event.h | 2 +- kernel/bpf/stackmap.c | 4 ++-- kernel/events/callchain.c | 12 ++++++------ kernel/events/core.c | 2 +- 4 files changed, 10 insertions(+), 10 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index ec9d960256839..54e0d31afcad1 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1719,7 +1719,7 @@ DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry); extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); extern struct perf_callchain_entry * -get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, +get_perf_callchain(struct pt_regs *regs, bool kernel, bool user, u32 max_stack, bool crosstask, bool add_mark); extern int get_callchain_buffers(int max_stack); extern void put_callchain_buffers(void); diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index 3615c06b7dfa9..ec3a57a5fba1f 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -314,7 +314,7 @@ BPF_CALL_3(bpf_get_stackid, struct pt_regs *, regs, struct bpf_map *, map, if (max_depth > sysctl_perf_event_max_stack) max_depth = sysctl_perf_event_max_stack; - trace = get_perf_callchain(regs, 0, kernel, user, max_depth, + trace = get_perf_callchain(regs, kernel, user, max_depth, false, false); if (unlikely(!trace)) @@ -451,7 +451,7 @@ static long __bpf_get_stack(struct pt_regs *regs, struct task_struct *task, else if (kernel && task) trace = get_callchain_entry_for_task(task, max_depth); else - trace = get_perf_callchain(regs, 0, kernel, user, max_depth, + trace = get_perf_callchain(regs, kernel, user, max_depth, crosstask, false); if (unlikely(!trace) || trace->nr < skip) { diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c index 2609998ca07f1..5982d18f169bd 100644 --- a/kernel/events/callchain.c +++ b/kernel/events/callchain.c @@ -217,7 +217,7 @@ static void fixup_uretprobe_trampoline_entries(struct perf_callchain_entry *entr } struct perf_callchain_entry * -get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, +get_perf_callchain(struct pt_regs *regs, bool kernel, bool user, u32 max_stack, bool crosstask, bool add_mark) { struct perf_callchain_entry *entry; @@ -232,11 +232,11 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, if (!entry) return NULL; - ctx.entry = entry; - ctx.max_stack = max_stack; - ctx.nr = entry->nr = init_nr; - ctx.contexts = 0; - ctx.contexts_maxed = false; + ctx.entry = entry; + ctx.max_stack = max_stack; + ctx.nr = entry->nr = 0; + ctx.contexts = 0; + ctx.contexts_maxed = false; if (kernel && !user_mode(regs)) { if (add_mark) diff --git a/kernel/events/core.c b/kernel/events/core.c index 970c4a5ab763b..01d080978865f 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8205,7 +8205,7 @@ perf_callchain(struct perf_event *event, struct pt_regs *regs) if (!kernel && !user) return &__empty_callchain; - callchain = get_perf_callchain(regs, 0, kernel, user, + callchain = get_perf_callchain(regs, kernel, user, max_stack, crosstask, true); return callchain ?: &__empty_callchain; } -- 2.51.0