| Message ID | 20210310135128.846868-1-willy@infradead.org (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | fb_defio: Remove custom address_space_operations | expand |
On Wed, Mar 10, 2021 at 01:51:28PM +0000, Matthew Wilcox (Oracle) wrote: > 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 set 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> Looks good: Reviewed-by: Christoph Hellwig <hch@lst.de>
Looks good, just one super minor nit inline. Reviewed-by: William Kucharski <william.kucharski@oracle.com> > On Mar 10, 2021, at 6:51 AM, Matthew Wilcox (Oracle) <willy@infradead.org> wrote: > > 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 set 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> > --- > drivers/video/fbdev/core/fb_defio.c | 33 ----------------------------- > drivers/video/fbdev/core/fbmem.c | 4 ---- > include/linux/fb.h | 3 --- > 3 files changed, 40 deletions(-) > > diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c > index a591d291b231..1bb208b3c4bb 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; > @@ -212,14 +194,6 @@ 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; > @@ -228,13 +202,6 @@ void fb_deferred_io_cleanup(struct fb_info *info) > > 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); > } We no longer need the definition of "int i" right before the BUG_ON(). > 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 > >
On Wed, Mar 10, 2021 at 06:38:07PM +0000, William Kucharski wrote: > Looks good, just one super minor nit inline. > > @@ -228,13 +202,6 @@ void fb_deferred_io_cleanup(struct fb_info *info) > > > > 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); > > } > > We no longer need the definition of "int i" right before the BUG_ON(). Huh. Usually gcc warns about that. let me figure that out and post a v2.
diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index a591d291b231..1bb208b3c4bb 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; @@ -212,14 +194,6 @@ 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; @@ -228,13 +202,6 @@ void fb_deferred_io_cleanup(struct fb_info *info) 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);
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 set 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> --- drivers/video/fbdev/core/fb_defio.c | 33 ----------------------------- drivers/video/fbdev/core/fbmem.c | 4 ---- include/linux/fb.h | 3 --- 3 files changed, 40 deletions(-)