ide: use PageHighMem() instead of ifdefs in ide_pio_bytes()

Use PageHighMem() instead of ifdefs in ide_pio_bytes()
(=> local IRQs won't be disabled when not necessary).

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-taskfile.c

@@ -195,9 +195,7 @@ static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 	struct scatterlist *sg = hwif->sg_table;
 	struct scatterlist *cursg = cmd->cursg;
 	struct page *page;
-#ifdef CONFIG_HIGHMEM
 	unsigned long flags;
-#endif
 	unsigned int offset;
 	u8 *buf;
 
@@ -218,9 +216,9 @@ static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 		page = nth_page(page, (offset >> PAGE_SHIFT));
 		offset %= PAGE_SIZE;
 
-#ifdef CONFIG_HIGHMEM
-		local_irq_save(flags);
-#endif
+		if (PageHighMem(page))
+			local_irq_save(flags);
+
 		buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
 
 		cmd->nleft -= nr_bytes;
@@ -238,9 +236,9 @@ static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 			hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
 
 		kunmap_atomic(buf, KM_BIO_SRC_IRQ);
-#ifdef CONFIG_HIGHMEM
-		local_irq_restore(flags);
-#endif
+
+		if (PageHighMem(page))
+			local_irq_restore(flags);
 
 		len -= nr_bytes;
 	}