demos/janitorings/clear_page.cocci

   1 // From: Shani Moideen <shani.moideen@wipro.com>
   2 // Subject: [KJ] [KJ PATCH] Replacing memset(<addr>,0,PAGE_SIZE) with
   3 //      clear_page(<addr>) in drivers/char/drm/i810_dma.c
   4 //
   5 // Replacing memset(<addr>,0,PAGE_SIZE) with clear_page(<addr>)
   6 // in drivers/char/drm/i810_dma.c
   7 //
   8 // Signed-off-by: Shani Moideen <shani.moideen@wipro.com>
   9 // ----
  10 //
  11 // diff --git a/drivers/char/drm/i810_dma.c b/drivers/char/drm/i810_dma.c
  12 // index 603d17f..4dbd97f 100644
  13 // --- a/drivers/char/drm/i810_dma.c
  14 // +++ b/drivers/char/drm/i810_dma.c
  15 // @@ -413,7 +413,7 @@ static int i810_dma_initialize(drm_device_t * dev,
  16 //              DRM_ERROR("Can not allocate hardware status page\n");
  17 //              return -ENOMEM;
  18 //      }
  19 // -    memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
  20 // +    clear_page(dev_priv->hw_status_page);
  21
  22
  23 // script found on KJ:
  24 // grep -e "memset ?\([^,]+, ?, ?0, ?PAGE_SIZE\) "
  25
  26 @@
  27 expression X;
  28 @@
  29
  30 -       memset(X, 0, PAGE_SIZE)
  31 +       clear_page(X)
  32