Re: e2fsprogs alignment

[Nicolas Pitre <nico@xxxxxxxxxxx>]

On Mon, 9 Jul 2012, Eric Sandeen wrote:

> On 7/9/12 9:45 AM, Gordan Bobic wrote:
> 
> > [...]
> 
> Maybe I should know, but what happens on < ARMv7+ ?  Memory corruption?
> If so I'm surprised that extN doesn't fall down all over the place today.

>From ARMv6 and above, "simple" unaligned accesses are handled by the 
hardware.  By "simple" I mean word sized i.e. no LDM/STM, no LDRD/STRD.

> > 1) Detect sizeof(int) and declare the arrays as a suitable multiple
> > of that. int _should_ be word sized on most things AFAIK.
> 
> now I'll sound really dense, but isn't 4096 a multiple of sizeof(int)
> on arm?

A char array doesn't have the same alignment constraints as an int.

It's not the size but the type used that matters.


Nicolas
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