PM / Hibernate: Call flush_icache_range() on pages restored in-place

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / kernel / power / swap.c

diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 12cd989..160e100 100644 (file)
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -37,6 +37,14 @@
 #define HIBERNATE_SIG  "S1SUSPEND"
 
 /*
+ * When reading an {un,}compressed image, we may restore pages in place,
+ * in which case some architectures need these pages cleaning before they
+ * can be executed. We don't know which pages these may be, so clean the lot.
+ */
+static bool clean_pages_on_read;
+static bool clean_pages_on_decompress;
+
+/*
  *     The swap map is a data structure used for keeping track of each page
  *     written to a swap partition.  It consists of many swap_map_page
  *     structures that contain each an array of MAP_PAGE_ENTRIES swap entries.
@@ -241,6 +249,9 @@ static void hib_end_io(struct bio *bio)
 
        if (bio_data_dir(bio) == WRITE)
                put_page(page);
+       else if (clean_pages_on_read)
+               flush_icache_range((unsigned long)page_address(page),
+                                  (unsigned long)page_address(page) + PAGE_SIZE);
 
        if (bio->bi_error && !hb->error)
                hb->error = bio->bi_error;
@@ -1049,6 +1060,7 @@ static int load_image(struct swap_map_handle *handle,
 
        hib_init_batch(&hb);
 
+       clean_pages_on_read = true;
        printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n",
                nr_to_read);
        m = nr_to_read / 10;
@@ -1124,6 +1136,10 @@ static int lzo_decompress_threadfn(void *data)
                d->unc_len = LZO_UNC_SIZE;
                d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len,
                                               d->unc, &d->unc_len);
+               if (clean_pages_on_decompress)
+                       flush_icache_range((unsigned long)d->unc,
+                                          (unsigned long)d->unc + d->unc_len);
+
                atomic_set(&d->stop, 1);
                wake_up(&d->done);
        }
@@ -1189,6 +1205,8 @@ static int load_image_lzo(struct swap_map_handle *handle,
        }
        memset(crc, 0, offsetof(struct crc_data, go));
 
+       clean_pages_on_decompress = true;
+
        /*
         * Start the decompression threads.
         */