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* [PATCH v2] fb_defio: Remove custom address_space_operations
@ 2021-03-10 18:55 Matthew Wilcox (Oracle)
  2021-03-11  0:46 ` William Kucharski
                   ` (2 more replies)
  0 siblings, 3 replies; 8+ messages in thread
From: Matthew Wilcox (Oracle) @ 2021-03-10 18:55 UTC (permalink / raw)
  To: dri-devel, linux-fbdev
  Cc: Matthew Wilcox (Oracle),
	linux-kernel, Daniel Vetter, Ian Campbell, Jaya Kumar,
	Jani Nikula, linux-mm, linux-fsdevel, Christoph Hellwig,
	William Kucharski

There's no need to give the page an address_space.  Leaving the
page->mapping as NULL will cause the VM to handle set_page_dirty()
the same way that it's handled now, and that was the only reason to
set the address_space in the first place.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
---
v2: Delete local variable definitions
 drivers/video/fbdev/core/fb_defio.c | 35 -----------------------------
 drivers/video/fbdev/core/fbmem.c    |  4 ----
 include/linux/fb.h                  |  3 ---
 3 files changed, 42 deletions(-)

diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index a591d291b231..b292887a2481 100644
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -52,13 +52,6 @@ static vm_fault_t fb_deferred_io_fault(struct vm_fault *vmf)
 		return VM_FAULT_SIGBUS;
 
 	get_page(page);
-
-	if (vmf->vma->vm_file)
-		page->mapping = vmf->vma->vm_file->f_mapping;
-	else
-		printk(KERN_ERR "no mapping available\n");
-
-	BUG_ON(!page->mapping);
 	page->index = vmf->pgoff;
 
 	vmf->page = page;
@@ -151,17 +144,6 @@ static const struct vm_operations_struct fb_deferred_io_vm_ops = {
 	.page_mkwrite	= fb_deferred_io_mkwrite,
 };
 
-static int fb_deferred_io_set_page_dirty(struct page *page)
-{
-	if (!PageDirty(page))
-		SetPageDirty(page);
-	return 0;
-}
-
-static const struct address_space_operations fb_deferred_io_aops = {
-	.set_page_dirty = fb_deferred_io_set_page_dirty,
-};
-
 int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
 	vma->vm_ops = &fb_deferred_io_vm_ops;
@@ -212,29 +194,12 @@ void fb_deferred_io_init(struct fb_info *info)
 }
 EXPORT_SYMBOL_GPL(fb_deferred_io_init);
 
-void fb_deferred_io_open(struct fb_info *info,
-			 struct inode *inode,
-			 struct file *file)
-{
-	file->f_mapping->a_ops = &fb_deferred_io_aops;
-}
-EXPORT_SYMBOL_GPL(fb_deferred_io_open);
-
 void fb_deferred_io_cleanup(struct fb_info *info)
 {
 	struct fb_deferred_io *fbdefio = info->fbdefio;
-	struct page *page;
-	int i;
 
 	BUG_ON(!fbdefio);
 	cancel_delayed_work_sync(&info->deferred_work);
-
-	/* clear out the mapping that we setup */
-	for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {
-		page = fb_deferred_io_page(info, i);
-		page->mapping = NULL;
-	}
-
 	mutex_destroy(&fbdefio->lock);
 }
 EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup);
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 06f5805de2de..372b52a2befa 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1415,10 +1415,6 @@ __releases(&info->lock)
 		if (res)
 			module_put(info->fbops->owner);
 	}
-#ifdef CONFIG_FB_DEFERRED_IO
-	if (info->fbdefio)
-		fb_deferred_io_open(info, inode, file);
-#endif
 out:
 	unlock_fb_info(info);
 	if (res)
diff --git a/include/linux/fb.h b/include/linux/fb.h
index ecfbcc0553a5..a8dccd23c249 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -659,9 +659,6 @@ static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
 /* drivers/video/fb_defio.c */
 int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma);
 extern void fb_deferred_io_init(struct fb_info *info);
-extern void fb_deferred_io_open(struct fb_info *info,
-				struct inode *inode,
-				struct file *file);
 extern void fb_deferred_io_cleanup(struct fb_info *info);
 extern int fb_deferred_io_fsync(struct file *file, loff_t start,
 				loff_t end, int datasync);
-- 
2.30.0


^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2021-06-01 15:39 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-03-10 18:55 [PATCH v2] fb_defio: Remove custom address_space_operations Matthew Wilcox (Oracle)
2021-03-11  0:46 ` William Kucharski
2021-03-12 14:12 ` Daniel Vetter
     [not found] ` <YLPjwUUmHDRjyPpR@Ryzen-9-3900X.localdomain>
2021-05-30 21:14   ` Matthew Wilcox
2021-05-30 22:40     ` Nathan Chancellor
2021-06-01 14:10     ` Daniel Vetter
2021-06-01 14:30       ` Matthew Wilcox
2021-06-01 15:39         ` Daniel Vetter

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