Re: [PATCH] MIPS: Check BITS_PER_LONG instead of __SIZEOF_LONG__

[David Daney <ddaney.cavm@gmail.com>]

On 12/06/2012 11:12 AM, Geert Uytterhoeven wrote:
> When building a 32-bit kernel for RBTX4927 with gcc version 4.1.2 20061115
> (prerelease) (Ubuntu 4.1.1-21), I get:
>
> arch/mips/lib/delay.c:24:5: warning: "__SIZEOF_LONG__" is not defined

Sorry, looks like it may have been added in GCC-4.3.  I didn't check any 
earlier versions when I made the original patch.



>
> As a consequence, __delay() always uses the 64-bit "dsubu" instruction.
>
> Replace the check for "__SIZEOF_LONG__ == 4" by "BITS_PER_LONG == 32" to
> fix this.
>
> Introduced by commit 5210edcd527773c227465ad18e416a894966324f ("MIPS: Make
> __{,n,u}delay declarations match definitions and generic delay.h")
>
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> --
> Untested on real hardware.
> Ralf, is this sufficient to prevent you from nuking RBTX4927 support? ;-)
> ---
>   arch/mips/lib/delay.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/mips/lib/delay.c b/arch/mips/lib/delay.c
> index dc81ca8..288f795 100644
> --- a/arch/mips/lib/delay.c
> +++ b/arch/mips/lib/delay.c
> @@ -21,7 +21,7 @@ void __delay(unsigned long loops)
>   	"	.set	noreorder				\n"
>   	"	.align	3					\n"
>   	"1:	bnez	%0, 1b					\n"
> -#if __SIZEOF_LONG__ == 4
> +#if BITS_PER_LONG == 32
>   	"	subu	%0, 1					\n"
>   #else
>   	"	dsubu	%0, 1					\n"
>