From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF065C5B543 for ; Fri, 30 May 2025 11:47:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9019010E7D7; Fri, 30 May 2025 11:47:07 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="nr9ZcbKZ"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id D0A7810E0E4; Fri, 30 May 2025 11:47:05 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 1353644269; Fri, 30 May 2025 11:47:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D140C4CEE9; Fri, 30 May 2025 11:47:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748605622; bh=PPWkMV6RF/9nIArnrSMpfu5q6WPdhMpJzoHVhO95F74=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=nr9ZcbKZeHr45euNhVKpWXVcky+dUSDmAy3i/ZNUf55AQfRjh+Adb9+WC5uKM1eGr PszIg6rrh6MZlelEi2d54tgUXy0EqeOOjmdnq3XyOaGHlF/H6lm0p0ws1HUjVZkm+H Yut4j+V7jeNqN5rSD5iIRA3bsTNhp8tl8u+11T7TOJaV8yuFTT+vE7pesz2H9NW89p I85kpbBbXBenNmc9YZPz+36sL1is9jvG3YE4grLk1JUj7Lv0ohN35UQ02ZfWURcXfb ARnZC8jwSFBXyGGD73MTMY1wwBGf1enFmiw4O63P2qBFWtBAixwsN1j3+K+qM0ECDF O2l/7yrxj9KuA== Message-ID: Subject: Re: [PATCH v12 04/10] ref_tracker: have callers pass output function to pr_ostream() From: Jeff Layton To: Krzysztof Karas Cc: Andrew Morton , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Kuniyuki Iwashima , Qasim Ijaz , Nathan Chancellor , Andrew Lunn , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Date: Fri, 30 May 2025 07:47:00 -0400 In-Reply-To: References: <20250529-reftrack-dbgfs-v12-0-11b93c0c0b6e@kernel.org> <20250529-reftrack-dbgfs-v12-4-11b93c0c0b6e@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Fri, 2025-05-30 at 11:13 +0000, Krzysztof Karas wrote: > Hi Jeff, >=20 > [...] > > +static void __ostream_printf pr_ostream_buf(struct ostream *stream, ch= ar *fmt, ...) > > +{ > > + int ret, len =3D stream->size - stream->used; > > + va_list args; > > + > > + va_start(args, fmt); > > + ret =3D vsnprintf(stream->buf + stream->used, len, fmt, args); > vsnprintf() technically may return a negative error code. > In that case, we'd be adding some unwanted values to the > stream->used. When we encounter an error we could skip > modifying that field. >=20 > > + va_end(args); > > + stream->used +=3D min(ret, len); > > +} > > + > [...] >=20 Good catch. I'll change this to be: va_start(args, fmt); ret =3D vsnprintf(stream->buf + stream->used, len, fmt, args); va_end(args); if (ret > 0) stream->used +=3D min(ret, len); --=20 Jeff Layton