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SubjectRe: initialization of static per-cpu variables
On Sun, May 25, 2008 at 08:35:24PM +1000, Rusty Russell wrote:
> On Saturday 24 May 2008 00:29:04 Adrian Bunk wrote:
> > On Thu, May 22, 2008 at 06:20:06PM +1000, Rusty Russell wrote:
> > > Yep, it was an old toolchain used by Sparc: DaveM found this one. As you
> > > say, it's ancient: I'm happy to queue a cleanup patch now everyone is on
> > > a modern compiler.
> >
> > The commit says:
> >
> > GCC3.1 apparently gets confused about uninitialized sections
> >
> > We do still support gcc 3.2 (which is the same as 3.1 except for a C++
> > ABI change) as a compiler for the kernel.
> Adrian, that's a little silly. There are obviously bug fixes in 3.2 over
> 3.1.0.

I've checked the announcements of 3.1.1 and 3.2, and at least for me
nothing looked like it would fix this bug.

> Noone has complained about the introduction of multiple other cases
> which would screw things up if they experienced this bug.

I doubt there is any serious userbase for gcc 3.2 left.

But your "now everyone is on a modern compiler" does not match what we
announce as supported compiler versions for the kernel.

If you have a good reason for pushing the minimum required gcc version
for compiling the kernel to 3.3 or 3.4 [1] you have my full support, but
as long as we officially support gcc 3.2 we should try to break as few
as possible - especially since it will take time until anyone will run
into any breakage.

> Finally, it's a sparc64 problem and DaveM acked already.

Was it a sparc64 problem or a generic problem DaveM happened to run into
on sparc?

> That's half the userbase!

sparc64 isn't that unpopular...

> Cheers,
> Rusty.

Sorry if I'm sounding overly pedantic, but I want that what we try as
good as possible that what we announce as being supported also works
(even if this results in several workarounds shipped).


[1] gcc 3.4 still has a serious userbase at least in ARM country, so you
won't be able to drop support for it


"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

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