linux-kernel - [PATCH v2 18/18] fbdev: Document that framebuffer

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Date:   Thu, 13 Jul 2023 14:58:38 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, javierm@...hat.com
Cc:     linux-sh@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        linux-input@...r.kernel.org, linux-media@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-geode@...ts.infradead.org, linux-nvidia@...ts.surfsouth.com,
        linux-hyperv@...r.kernel.org, linux-omap@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Miguel Ojeda <ojeda@...nel.org>
Subject: [PATCH v2 18/18] fbdev: Document that framebuffer_alloc() returns zero'ed data

Most fbdev drivers depend on framebuffer_alloc() to initialize the
allocated memory to 0. Document this guarantee.

Suggested-by: Miguel Ojeda <ojeda@...nel.org>
Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Helge Deller <deller@....de>
---
 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.
  *
-- 
2.41.0