x86/boot: add BIT() to boot/bitops.h

The boot/bitops.h has guards against including the regular bitops (include/asm-generic/bitops.h), it only implements what we need at early boot. We'll be making use of BIT() later so add it.

Users of boot/boot.h must include it prior to asm/setup.h otherwise the guard protection devised against the regular linux/bitops.h will not take effect.

v2: spelling fixes, and language descriptipon enhancements

by Konrad.

Signed-off-by Luis R. Rodriguez <[email protected]>

---

This patch is originally part of a much larger series [0], this is v2 of the original patch 3/8 [1]. I've split this single patch out on its own now that it should be clear how I intend on using BIT() on early code.

[0] http://lkml.kernel.org/r/[email protected]
[1] http://lkml.kernel.org/r/[email protected]

 arch/x86/boot/bitops.h | 2 ++
 arch/x86/boot/boot.h   | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

arch/x86/boot/bitops.h +2 -0

index 878e4b9940d9..232cff0ff4e3 100644
@@ -40,4 +40,6 @@ static inline void set_bit(int nr, void *addr)
 	asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
 }
 
+#define BIT(x)	(1 << x)
+
 #endif /* BOOT_BITOPS_H */

arch/x86/boot/boot.h +1 -1

index 9011a88353de..4fb53da1f48a 100644
@@ -23,8 +23,8 @@
 #include <stdarg.h>
 #include <linux/types.h>
 #include <linux/edd.h>
-#include <asm/setup.h>
 #include "bitops.h"
+#include <asm/setup.h>
 #include "ctype.h"
 #include "cpuflags.h"
 

Signature · 1 line

2.7.0