Re: [Xen-devel] [RFC v1 3/8] x86/boot: add BIT() to boot/bitops.h

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Dec 15, 2015 at 02:16:32PM -0800, Luis R. Rodriguez wrote:
> From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
> 
> The boot/bitops.h guards against included the regular bitops,

It may sounds better this way:

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.

Where? Could you paste in the name of the patch in the description?
> 
> Users of boot/boot.h must include it prior to asm/setup.h
> otherwise the guard protection devise against the regular

s/devise/devised/
> linux/bitops.h will not take effect.
> 
> Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
> ---
>  arch/x86/boot/bitops.h | 2 ++
>  arch/x86/boot/boot.h   | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/boot/bitops.h b/arch/x86/boot/bitops.h
> index 878e4b9940d9..232cff0ff4e3 100644
> --- a/arch/x86/boot/bitops.h
> +++ b/arch/x86/boot/bitops.h
> @@ -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 */
> diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
> index 9011a88353de..4fb53da1f48a 100644
> --- a/arch/x86/boot/boot.h
> +++ b/arch/x86/boot/boot.h
> @@ -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"
>  
> -- 
> 2.6.2
> 

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