From patchwork Thu Jul 13 12:58:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 702544 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F00CC04A94 for ; Thu, 13 Jul 2023 13:04:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234775AbjGMNEs (ORCPT ); Thu, 13 Jul 2023 09:04:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234887AbjGMNDy (ORCPT ); Thu, 13 Jul 2023 09:03:54 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C6E3173B; Thu, 13 Jul 2023 06:03:51 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id AED3122195; Thu, 13 Jul 2023 13:03:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1689253429; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BhF3dZeu/sRgLYS001c8kRsipcWJq/VtROn6MCXX9YY=; b=daj/vSUVGOXQMsWsXdc+Ezaimt8K1JNrFAhTxGzWNIIlcyltS1JZ7L9HTmbYfpLfKmah39 ++SGiAxPCteVilbBx7ZxMORu+6/fY818F5BRt6I4Xec64Sdh80+NuEnIVW0hnVJcU/dZGr Zs1E7FQuffTtJHR//mnA7HbWjGqT5JY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1689253429; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BhF3dZeu/sRgLYS001c8kRsipcWJq/VtROn6MCXX9YY=; b=o0c2teiwOf7OFQ0r9afxe1lhotl2L0LZtSF0FaKNAs7JMdD6urEtIcw/0oan/UIGoPysnY EiveJuQ4bX1ndICA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 5A42913489; Thu, 13 Jul 2023 13:03:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 6M7yFDX2r2TVPgAAMHmgww (envelope-from ); Thu, 13 Jul 2023 13:03:49 +0000 From: Thomas Zimmermann To: deller@gmx.de, javierm@redhat.com Cc: linux-sh@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-geode@lists.infradead.org, linux-nvidia@lists.surfsouth.com, linux-hyperv@vger.kernel.org, linux-omap@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, Thomas Zimmermann , Miguel Ojeda Subject: [PATCH v2 18/18] fbdev: Document that framebuffer_alloc() returns zero'ed data Date: Thu, 13 Jul 2023 14:58:38 +0200 Message-ID: <20230713130338.31086-19-tzimmermann@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230713130338.31086-1-tzimmermann@suse.de> References: <20230713130338.31086-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Most fbdev drivers depend on framebuffer_alloc() to initialize the allocated memory to 0. Document this guarantee. Suggested-by: Miguel Ojeda Signed-off-by: Thomas Zimmermann Cc: Helge Deller --- drivers/video/fbdev/core/fb_info.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/video/fbdev/core/fb_info.c b/drivers/video/fbdev/core/fb_info.c index 8bdbefdd4b70..1b7615fc393d 100644 --- a/drivers/video/fbdev/core/fb_info.c +++ b/drivers/video/fbdev/core/fb_info.c @@ -13,7 +13,8 @@ * * Creates a new frame buffer info structure. Also reserves @size bytes * for driver private data (info->par). info->par (if any) will be - * aligned to sizeof(long). + * aligned to sizeof(long). Both, the instance of struct fb_info and + * the driver private data, are cleared to zero. * * Returns the new structure, or NULL if an error occurred. *