fs: erofs: Guard blk_throtl_get_quota() calls with CONFIG_BLK_DEV_THR…

…OTTLING

* In Huawei P10 HMOS2.0 kernel, blk_throtl_get_quota() is provided by CONFIG_BLK_DEV_THROTTLING
* When CONFIG_BLK_DEV_THROTTLING is disabled, the function just returns true, seems to be unnecessary
* CONFIG_BLK_DEV_THROTTLING doesn't exist here, just guard it

Change-Id: I885f57686679beebe30c85be42bfc9f922f520ae

fs/erofs/unzip_vle.c

@@ -1631,7 +1631,9 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
 					      unsigned int nr_pages)
 {
 	struct inode *const inode = mapping->host;
+#ifdef CONFIG_BLK_DEV_THROTTLING
 	struct block_device *bdev = inode->i_sb->s_bdev;
+#endif
 	struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
 
 	bool sync = __should_decompress_synchronously(sbi, nr_pages);
@@ -1643,6 +1645,7 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
 
 	trace_erofs_readpages(mapping->host, lru_to_page(pages), nr_pages, false);
 
+#ifdef CONFIG_BLK_DEV_THROTTLING
 	if (pages) {
 		/*
 		 * Get one quota before read pages, when this ends,
@@ -1652,6 +1655,7 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
 		blk_throtl_get_quota(bdev, PAGE_SIZE,
 				     msecs_to_jiffies(100), true);
 	}
+#endif
 
 #if (EROFS_FS_ZIP_CACHE_LVL >= 2)
 	f.cachedzone_la = lru_to_page(pages)->index << PAGE_SHIFT;
@@ -1707,10 +1711,12 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
 	/* clean up the remaining free pages */
 	put_pages_list(&pagepool);
 
+#ifdef CONFIG_BLK_DEV_THROTTLING
 	if (io_submitted)
 		while (--io_submitted)
 			blk_throtl_get_quota(bdev, PAGE_SIZE,
 					     msecs_to_jiffies(100), true);
+#endif
 	return 0;
 }