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Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures [message #14153 is a reply to message #14152]

Fri, 15 June 2007 15:24

Arnd Bergmann
Messages: 10
Registered: February 2006

Junior Member

On Friday 15 June 2007, Vasily Tarasov wrote:
> I just noticed that we can not avoid the addition of packed attribute.
> Look, for example:
>
> struct if_dqblk {
> � � � � __u64 dqb_bhardlimit;
> � � � � __u64 dqb_bsoftlimit;
> � � � � __u64 dqb_curspace;
> � � � � __u64 dqb_ihardlimit;
> � � � � __u64 dqb_isoftlimit;
> � � � � __u64 dqb_curinodes;
> � � � � __u64 dqb_btime;
> � � � � __u64 dqb_itime;
> � � � � __u32 dqb_valid;
> };
>
> sizeof(if_dqblk) = 0x48
> On 32 bit: 0x44
>
> If I replace __u64/__u32 with compat equivalents - it will not help!
> alligned attribute can _only_ _increase_ the size of structure, but not
> decrease it.

No, the gcc documentation isn't quite clear there, see the discussion about
compat_u64 and compat_s64 types. It actually does the right thing when
you use 'typedef __u64 __attribute__((aligned(64))) compat_64', as my
patch does.

Arnd <><

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[Message index]

		[PATCH] diskquota: 32bit quota tools on 64bit architectures By: Anonymous Coward on Thu, 19 October 2006 12:30
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Alan Cox on Thu, 19 October 2006 13:03
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: rdunlap on Thu, 19 October 2006 15:20
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Christoph Hellwig on Thu, 19 October 2006 17:29
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Anonymous Coward on Fri, 20 October 2006 06:08
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Arnd Bergmann on Sat, 21 October 2006 16:28
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: David Chinner on Mon, 23 October 2006 02:12
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Anonymous Coward on Mon, 23 October 2006 10:50
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Anonymous Coward on Fri, 20 October 2006 05:58
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Anonymous Coward on Fri, 20 October 2006 06:28
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Christoph Hellwig on Fri, 20 October 2006 07:12
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Andi Kleen on Fri, 20 October 2006 12:21
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Vasily Tarasov on Fri, 15 June 2007 10:41
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Vasily Tarasov on Fri, 15 June 2007 11:00
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Arnd Bergmann on Fri, 15 June 2007 10:43
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Vasily Tarasov on Fri, 15 June 2007 14:48
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Arnd Bergmann on Fri, 15 June 2007 15:24
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Vasily Tarasov on Mon, 18 June 2007 07:41
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Mikael Pettersson on Fri, 15 June 2007 10:03
		Re: [PATCH] diskquota: 32bit quota tools on 64bit architectures By: Mikael Pettersson on Fri, 15 June 2007 11:08

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