linux-kernel - Re: [patch 1/2] bootmem: add alloc_bootmem

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Date:	Tue, 16 Nov 2010 16:06:50 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	"hpa@...or.com" <hpa@...or.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.jf.intel.com>
Subject: Re: [patch 1/2] bootmem: add alloc_bootmem_align()

On Tue, 2010-11-16 at 14:14 -0800, H. Peter Anvin wrote:
> On 11/16/2010 01:23 PM, Suresh Siddha wrote:
> > Index: tree/include/linux/bootmem.h
> > ===================================================================
> > --- tree.orig/include/linux/bootmem.h
> > +++ tree/include/linux/bootmem.h
> > @@ -105,6 +105,8 @@ extern void *__alloc_bootmem_low_node(pg
> >  
> >  #define alloc_bootmem(x) \
> >  	__alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
> > +#define alloc_bootmem_align(x, align) \
> > +	__alloc_bootmem(x, align, __pa(MAX_DMA_ADDRESS))
> >  #define alloc_bootmem_nopanic(x) \
> >  	__alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
> >  #define alloc_bootmem_pages(x) \
> 
>   [...]
> 
> >  	 */
> > -	init_xstate_buf = alloc_bootmem(xstate_size);
> > +	init_xstate_buf = alloc_bootmem_align(xstate_size,
> > +					      __alignof__(struct xsave_struct));
> >  	init_xstate_buf->i387.mxcsr = MXCSR_DEFAULT;
> 
> Perhaps it would make even more sense to have:
> 
> #define alloc_bootmem_alignof(x, type) \
> 	__alloc_bootmem(x, __alignof__(type), __pa(MAX_DMA_ADDRESS))
> 

Wanted to keep it broad so that more people can start using it.

For example, most of the current x86 uses of alloc_bootmem_pages() (or
the __alloc_bootmem() calls in other architectures) can be replaced with
alloc_bootmem_align() and most of them don't have a relevant type to
describe the alignment.

thanks,
suresh

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