tty/vt: consolemap: improve UNI_*() macros definitions

Use FIELD_GET() and GENMASK() helpers instead of direct shifts and ANDs.
This makes the code even more obvious. I didn't know about the helpers
at the time of writing the macros.

Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220614090537.15557-6-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
index 16d0d8f..9e94ec0 100644 (file)
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -23,6 +23,8 @@
  * stack overflow.
  */
 
+#include <linux/bitfield.h>
+#include <linux/bits.h>
 #include <linux/module.h>
 #include <linux/kd.h>
 #include <linux/errno.h>
@@ -190,10 +192,17 @@ static enum translation_map inv_translate[MAX_NR_CONSOLES];
 #define UNI_DIR_ROWS   32U
 #define UNI_ROW_GLYPHS 64U
 
-#define UNI_DIR(uni)           ( (uni)                   >> 11)
-#define UNI_ROW(uni)           (((uni) & GENMASK(10, 6)) >>  6)
-#define UNI_GLYPH(uni)         ( (uni) & GENMASK( 5, 0))
-#define UNI(dir, row, glyph)   (((dir) << 11) | ((row) << 6) | (glyph))
+#define UNI_DIR_BITS           GENMASK(15, 11)
+#define UNI_ROW_BITS           GENMASK(10,  6)
+#define UNI_GLYPH_BITS         GENMASK( 5,  0)
+
+#define UNI_DIR(uni)           FIELD_GET(UNI_DIR_BITS, (uni))
+#define UNI_ROW(uni)           FIELD_GET(UNI_ROW_BITS, (uni))
+#define UNI_GLYPH(uni)         FIELD_GET(UNI_GLYPH_BITS, (uni))
+
+#define UNI(dir, row, glyph)   (FIELD_PREP(UNI_DIR_BITS, (dir)) | \
+                                FIELD_PREP(UNI_ROW_BITS, (row)) | \
+                                FIELD_PREP(UNI_GLYPH_BITS, (glyph)))
 
 /**
  * struct uni_pagedict -- unicode directory