linux-kernel - [PATCH] arch/x86: Include <asm/fb.h> in fbdev source file

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Date:   Mon, 24 Apr 2023 10:47:51 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        deller@....de, arnd@...db.de, daniel.vetter@...ll.ch,
        javierm@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH] arch/x86: Include <asm/fb.h> in fbdev source file

Move the implementation of fb_pgprotect() to fbdev.c and include
<asm/fb.h>. Fixes the following warning:

  ../arch/x86/video/fbdev.c:14:5: warning: no previous prototype for 'fb_is_primary_device' [-Wmissing-prototypes]
     14 | int fb_is_primary_device(struct fb_info *info)
        |     ^~~~~~~~~~~~~~~~~~~~

Just including <asm/fb.h> results in a number of built-in errors
about undefined function. Moving fb_pgprotect() to the source file
avoids the required include statements in the header. The function
is only called occasionally from fb_mmap(), so having it as static
inline had no benefit.

While at it, fix the codying style in fbdev.c.

Link: https://elixir.bootlin.com/linux/v6.3-rc7/source/drivers/video/fbdev/core/fbmem.c#L1404
Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 arch/x86/include/asm/fb.h | 14 ++------------
 arch/x86/video/fbdev.c    | 17 ++++++++++++++++-
 2 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/arch/x86/include/asm/fb.h b/arch/x86/include/asm/fb.h
index a3fb801f12f1..23873da8fb77 100644
--- a/arch/x86/include/asm/fb.h
+++ b/arch/x86/include/asm/fb.h
@@ -2,21 +2,11 @@
 #ifndef _ASM_X86_FB_H
 #define _ASM_X86_FB_H
 
-#include <asm/page.h>
-
 struct fb_info;
 struct file;
+struct vm_area_struct;
 
-static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
-				unsigned long off)
-{
-	unsigned long prot;
-
-	prot = pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK;
-	if (boot_cpu_data.x86 > 3)
-		pgprot_val(vma->vm_page_prot) =
-			prot | cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
-}
+void fb_pgprotect(struct file *file, struct vm_area_struct *vma, unsigned long off);
 #define fb_pgprotect fb_pgprotect
 
 int fb_is_primary_device(struct fb_info *info);
diff --git a/arch/x86/video/fbdev.c b/arch/x86/video/fbdev.c
index 5ec4eafbb981..57ee3c158f97 100644
--- a/arch/x86/video/fbdev.c
+++ b/arch/x86/video/fbdev.c
@@ -6,11 +6,25 @@
  * for more details.
  *
  */
+
+#include <asm/fb.h>
+
 #include <linux/fb.h>
-#include <linux/pci.h>
 #include <linux/module.h>
+#include <linux/pci.h>
 #include <linux/vgaarb.h>
 
+void fb_pgprotect(struct file *file, struct vm_area_struct *vma, unsigned long off)
+{
+	unsigned long prot;
+
+	prot = pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK;
+	if (boot_cpu_data.x86 > 3)
+		pgprot_val(vma->vm_page_prot) =
+			prot | cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
+}
+EXPORT_SYMBOL(fb_pgprotect);
+
 int fb_is_primary_device(struct fb_info *info)
 {
 	struct device *device = info->device;
@@ -26,4 +40,5 @@ int fb_is_primary_device(struct fb_info *info)
 	return 0;
 }
 EXPORT_SYMBOL(fb_is_primary_device);
+
 MODULE_LICENSE("GPL");

base-commit: d2639bb054c42db5ff15c56902d1113303f5b655
prerequisite-patch-id: 0aa359f6144c4015c140c8a6750be19099c676fb
prerequisite-patch-id: c67e5d886a47b7d0266d81100837557fda34cb24
prerequisite-patch-id: cbc453ee02fae02af22fbfdce56ab732c7a88c36
-- 
2.40.0