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Groups > linux.kernel > #1206397
| From | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' |
| Date | 2015-08-13 00:40 +0200 |
| Message-ID | <pWMQG-15t-5@gated-at.bofh.it> (permalink) |
| References | (3 earlier) <pWxHY-4Bz-23@gated-at.bofh.it> <pWxHY-4Bz-25@gated-at.bofh.it> <pWxHY-4Bz-15@gated-at.bofh.it> <pWGrV-hj-15@gated-at.bofh.it> <pWMH1-TY-27@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Aug 12, 2015 at 3:20 PM, Andy Lutomirski <luto@kernel.org> wrote:
>
> Does your objection still apply if we supplied our own implementations of a
> handful of libgcc helpers?
We already do that.
Several architectures actually implement _udivdi3.
However, do_div() is actually the much simpler/better interface.
I don't think we have a single case in the kernel where we really want
the full 64/64 division, and the 64/32->64 case really is
fundamentally simpler.
This whole "do_div is so complicated" thing is just BS.
The thing that triggered Christoph to ask was a bug in the
implementation of that *simpler* interface. What makes you think that
making people implement _udivdi3 would magically avoid all such bugs?
Linus
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enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' Christoph Hellwig <hch@infradead.org> - 2015-08-12 08:30 +0200
Re: enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-12 17:50 +0200
Re: enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' Andy Lutomirski <luto@kernel.org> - 2015-08-13 00:30 +0200
Re: enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' Andy Lutomirski <luto@amacapital.net> - 2015-08-13 00:40 +0200
Re: enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 00:40 +0200
Re: enabling libgcc for 64-bit divisions, was Re: PROBLEM: XFS on ARM corruption 'Structure needs cleaning' Andrew Morton <akpm@linux-foundation.org> - 2015-08-13 05:30 +0200
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