linux-kernel - [PATCH v3 2/4] fbdev: Add flag indicating framebuffer is allocated from kernel memory

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Message-Id: <20250523161522.409504-3-mhklinux@outlook.com>
Date: Fri, 23 May 2025 09:15:20 -0700
From: mhkelley58@...il.com
To: simona@...ll.ch,
	deller@....de,
	haiyangz@...rosoft.com,
	kys@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	akpm@...ux-foundation.org
Cc: weh@...rosoft.com,
	tzimmermann@...e.de,
	hch@....de,
	dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v3 2/4] fbdev: Add flag indicating framebuffer is allocated from kernel memory

From: Michael Kelley <mhklinux@...look.com>

Add a flag that fbdev drivers can set to indicate that the framebuffer
memory comes from alloc_pages() or similar as opposed to vmalloc()
memory. The flag is to be used by fbdev deferred I/O.

Signed-off-by: Michael Kelley <mhklinux@...look.com>
---
Changes in v3:
* This patch is new in v3. The definition of FBINFO_KMEMFB
  was previously combined into the next patch of the series.
  [Helge Deller]

 include/linux/fb.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 05cc251035da..a1121116eef0 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -396,6 +396,7 @@ struct fb_tile_ops {
 
 /* hints */
 #define FBINFO_VIRTFB		0x0004 /* FB is System RAM, not device. */
+#define FBINFO_KMEMFB		0x0008 /* FB is allocated in contig kernel mem */
 #define FBINFO_PARTIAL_PAN_OK	0x0040 /* otw use pan only for double-buffering */
 #define FBINFO_READS_FAST	0x0080 /* soft-copy faster than rendering */
 
-- 
2.25.1