From patchwork Mon Apr 7 16:01:11 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 14041189 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 E73C2205ABB; Mon, 7 Apr 2025 15:59:57 +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=1744041598; cv=none; b=HeNncFjASa+lCWrVf6LehPIg9FYVo5n34zPh0q4idWH2la+c5n3jfrEqdgdaOEOM065vq3NzRn+a2bd5stFOvwxEM+7oVPLfFX1fuoKYgBGeYTveRGPkVohxX3crF77zDSIn9sN0SAv9ve62U2yVRc2kn5aJ/A8GrS6QdKruq/Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744041598; c=relaxed/simple; bh=9Bt31F+EEO1/gN5Bg5qO5PcuHnvn3ZA2QYRJT+0Yah0=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type; b=OIp8fP4wW7baNAPf7bcWAGRgGZHzE9I1pWJfcXSQyypQ65QutXADEKIbr71McTbA7HwvHnN9LOLO2sxKJO4eMQXZx5wCeTp1E5Diero/LYElm+FOaN1k7DyBGpgoJtiSZ4d6S+AkhYq0hvrQiyHovJxhQN3OYtDP0w33AmBrvhI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2FA8C4CEE7; Mon, 7 Apr 2025 15:59:56 +0000 (UTC) Date: Mon, 7 Apr 2025 12:01:11 -0400 From: Steven Rostedt To: LKML , Linux Trace Kernel Cc: Masami Hiramatsu , Mathieu Desnoyers , Guenter Roeck Subject: [PATCH] tracing: Hide get_vm_area() from MMUless builds Message-ID: <20250407120111.2ccc9319@gandalf.local.home> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Steven Rostedt The function get_vm_area() is not defined for non-MMU builds and causes a build error if it is used. Hide the map_pages() function around a: #ifdef CONFIG_MMU to keep it from being compiled when CONFIG_MMU is not set. Reported-by: Guenter Roeck Tested-by: Guenter Roeck Closes: https://lore.kernel.org/all/4f8ece8b-8862-4f7c-8ede-febd28f8a9fe@roeck-us.net/ Fixes: 394f3f02de531 ("tracing: Use vmap_page_range() to map memmap ring buffer") Signed-off-by: Steven Rostedt (Google) --- kernel/trace/trace.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b581e388a9d9..8ddf6b17215c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9806,6 +9806,7 @@ static int instance_mkdir(const char *name) return ret; } +#ifdef CONFIG_MMU static u64 map_pages(unsigned long start, unsigned long size) { unsigned long vmap_start, vmap_end; @@ -9828,6 +9829,12 @@ static u64 map_pages(unsigned long start, unsigned long size) return (u64)vmap_start; } +#else +static inline u64 map_pages(unsigned long start, unsigned long size) +{ + return 0; +} +#endif /** * trace_array_get_by_name - Create/Lookup a trace array, given its name.