3.0.51-stable review

@@ -4198,6 +4198,7 @@ static int __init floppy_init(void)
 
 		disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
 		if (!disks[dr]->queue) {
+			put_disk(disks[dr]);
 			err = -ENOMEM;
 			goto out_put_disk;
 		}

@@ -57,6 +57,7 @@
 #include <linux/mmu_notifier.h>
 #include <linux/migrate.h>
 #include <linux/hugetlb.h>
+#include <linux/backing-dev.h>
 
 #include <asm/tlbflush.h>
 

@@ -936,11 +937,8 @@ int page_mkclean(struct page *page)
 
 	if (page_mapped(page)) {
 		struct address_space *mapping = page_mapping(page);
-		if (mapping) {
+		if (mapping)
 			ret = page_mkclean_file(mapping, page);
-			if (page_test_and_clear_dirty(page_to_pfn(page), 1))
-				ret = 1;
-		}
 	}
 
 	return ret;

@@ -1121,6 +1119,8 @@ void page_add_file_rmap(struct page *pag
  */
 void page_remove_rmap(struct page *page)
 {
+	struct address_space *mapping = page_mapping(page);
+
 	/* page still mapped by someone else? */
 	if (!atomic_add_negative(-1, &page->_mapcount))
 		return;

@@ -1131,8 +1131,19 @@ void page_remove_rmap(struct page *page)
 	 * this if the page is anon, so about to be freed; but perhaps
 	 * not if it's in swapcache - there might be another pte slot
 	 * containing the swap entry, but page not yet written to swap.
+	 *
+	 * And we can skip it on file pages, so long as the filesystem
+	 * participates in dirty tracking; but need to catch shm and tmpfs
+	 * and ramfs pages which have been modified since creation by read
+	 * fault.
+	 *
+	 * Note that mapping must be decided above, before decrementing
+	 * mapcount (which luckily provides a barrier): once page is unmapped,
+	 * it could be truncated and page->mapping reset to NULL at any moment.
+	 * Note also that we are relying on page_mapping(page) to set mapping
+	 * to &swapper_space when PageSwapCache(page).
 	 */
-	if ((!PageAnon(page) || PageSwapCache(page)) &&
+	if (mapping && !mapping_cap_account_dirty(mapping) &&
 	    page_test_and_clear_dirty(page_to_pfn(page), 1))
 		set_page_dirty(page);
 	/*

@@ -209,7 +209,7 @@ out:
 	NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode);
 
 	if (blue == 0x18) {
-		NV_INFO(dev, "Load detected on head A\n");
+		NV_DEBUG(dev, "Load detected on head A\n");
 		return connector_status_connected;
 	}
 

@@ -323,7 +323,7 @@ nv17_dac_detect(struct drm_encoder *enco
 
 	if (nv17_dac_sample_load(encoder) &
 	    NV_PRAMDAC_TEST_CONTROL_SENSEB_ALLHI) {
-		NV_INFO(dev, "Load detected on output %c\n",
+		NV_DEBUG(dev, "Load detected on output %c\n",
 			'@' + ffs(dcb->or));
 		return connector_status_connected;
 	} else {

@@ -398,7 +398,7 @@ static void nv04_dac_commit(struct drm_e
 
 	helper->dpms(encoder, DRM_MODE_DPMS_ON);
 
-	NV_INFO(dev, "Output %s is running on CRTC %d using output %c\n",
+	NV_DEBUG(dev, "Output %s is running on CRTC %d using output %c\n",
 		drm_get_connector_name(&nouveau_encoder_connector_get(nv_encoder)->base),
 		nv_crtc->index, '@' + ffs(nv_encoder->dcb->or));
 }

@@ -447,7 +447,7 @@ static void nv04_dac_dpms(struct drm_enc
 		return;
 	nv_encoder->last_dpms = mode;
 
-	NV_INFO(dev, "Setting dpms mode %d on vga encoder (output %d)\n",
+	NV_DEBUG(dev, "Setting dpms mode %d on vga encoder (output %d)\n",
 		     mode, nv_encoder->dcb->index);
 
 	nv04_dac_update_dacclk(encoder, mode == DRM_MODE_DPMS_ON);

@@ -468,7 +468,7 @@ static void nv04_dfp_commit(struct drm_e
 
 	helper->dpms(encoder, DRM_MODE_DPMS_ON);
 
-	NV_INFO(dev, "Output %s is running on CRTC %d using output %c\n",
+	NV_DEBUG(dev, "Output %s is running on CRTC %d using output %c\n",
 		drm_get_connector_name(&nouveau_encoder_connector_get(nv_encoder)->base),
 		nv_crtc->index, '@' + ffs(nv_encoder->dcb->or));
 }

@@ -511,7 +511,7 @@ static void nv04_lvds_dpms(struct drm_en
 		return;
 	nv_encoder->last_dpms = mode;
 
-	NV_INFO(dev, "Setting dpms mode %d on lvds encoder (output %d)\n",
+	NV_DEBUG(dev, "Setting dpms mode %d on lvds encoder (output %d)\n",
 		     mode, nv_encoder->dcb->index);
 
 	if (was_powersaving && is_powersaving_dpms(mode))

@@ -556,7 +556,7 @@ static void nv04_tmds_dpms(struct drm_en
 		return;
 	nv_encoder->last_dpms = mode;
 
-	NV_INFO(dev, "Setting dpms mode %d on tmds encoder (output %d)\n",
+	NV_DEBUG(dev, "Setting dpms mode %d on tmds encoder (output %d)\n",
 		     mode, nv_encoder->dcb->index);
 
 	nv04_dfp_update_backlight(encoder, mode);

@@ -69,7 +69,7 @@ static void nv04_tv_dpms(struct drm_enco
 	struct nv04_mode_state *state = &dev_priv->mode_reg;
 	uint8_t crtc1A;
 
-	NV_INFO(dev, "Setting dpms mode %d on TV encoder (output %d)\n",
+	NV_DEBUG(dev, "Setting dpms mode %d on TV encoder (output %d)\n",
 		mode, nv_encoder->dcb->index);
 
 	state->pllsel &= ~(PLLSEL_TV_CRTC1_MASK | PLLSEL_TV_CRTC2_MASK);

@@ -162,7 +162,7 @@ static void nv04_tv_commit(struct drm_en
 
 	helper->dpms(encoder, DRM_MODE_DPMS_ON);
 
-	NV_INFO(dev, "Output %s is running on CRTC %d using output %c\n",
+	NV_DEBUG(dev, "Output %s is running on CRTC %d using output %c\n",
 		      drm_get_connector_name(&nouveau_encoder_connector_get(nv_encoder)->base), nv_crtc->index,
 		      '@' + ffs(nv_encoder->dcb->or));
 }