[PATCH] Console rotation fixes

Remove bogus usage of test/set_bit() from fbcon rotation code and just
manipulate the bits directly.  This fixes an oops on powerpc among others
and should be faster.  Seems to work fine on the G5 here.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 4 insertions, 11 deletions

diff --git a/drivers/video/console/fbcon_ccw.c b/drivers/video/console/fbcon_ccw.c
index 3afd1eeb1ade..4952b66ae206 100644
--- a/drivers/video/console/fbcon_ccw.c
+++ b/drivers/video/console/fbcon_ccw.c
@@ -34,7 +34,7 @@ static inline void ccw_update_attr(u8 *dst, u8 *src, int attribute,
                 msk <<= (8 - mod);
 
         if (offset > mod)
-                set_bit(FBCON_BIT(7), (void *)&msk1);
+                msk1 |= 0x01;
 
         for (i = 0; i < vc->vc_font.width; i++) {
                 for (j = 0; j < width; j++) {
diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h
index e504fbf5c604..1b8f92fdc6a8 100644
--- a/drivers/video/console/fbcon_rotate.h
+++ b/drivers/video/console/fbcon_rotate.h
@@ -21,21 +21,13 @@
         (s == SCROLL_REDRAW || s == SCROLL_MOVE || !(i)->fix.xpanstep) ? \
         (i)->var.xres : (i)->var.xres_virtual; })
 
-/*
- * The bitmap is always big endian
- */
-#if defined(__LITTLE_ENDIAN)
-#define FBCON_BIT(b) (7 - (b))
-#else
-#define FBCON_BIT(b) (b)
-#endif
 
 static inline int pattern_test_bit(u32 x, u32 y, u32 pitch, const char *pat)
 {
         u32 tmp = (y * pitch) + x, index = tmp / 8,  bit = tmp % 8;
 
         pat +=index;
-        return (test_bit(FBCON_BIT(bit), (void *)pat));
+        return (*pat) & (0x80 >> bit);
 }
 
 static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
@@ -43,7 +35,8 @@ static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
         u32 tmp = (y * pitch) + x, index = tmp / 8, bit = tmp % 8;
 
         pat += index;
-        set_bit(FBCON_BIT(bit), (void *)pat);
+
+        (*pat) |= 0x80 >> bit;
 }
 
 static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)