Re: What exactly is __ALIGN_STR in pnpbios/bioscalls.c for?

[Andreas Schwab]

Adrian Bunk <bunk@xxxxxxxxx> writes:

> include/linux/linkage.h in kernel 2.6 includes #define's for __ALIGN and 
> __ALIGN_STR. In include/asm-i386/linkage.h, their values are changed 
> #ifdef CONFIG_X86_ALIGNMENT_16.
>
> It isn't obvious what exacly CONFIG_X86_ALIGNMENT_16 is for (I've heard 
> more than one opinion), and since the __ALIGN_STR usage in 
> drivers/pnp/pnpbios/bioscalls.c is the only non-m68k usage of one of 
> these two #define's I wonder whether you might be able to enlighten me 
> what CONFIG_X86_ALIGNMENT_16 exactly is for?

It's for aligning function entries to a 16 byte boundary instead of only 4
bytes, used together with -malign-functions.  See also the ENTRY macro.
Note that the default value of __ALIGN is actually useless for anything
but x86 and x86-64.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@xxxxxxx
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