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SubjectRe: 2.5.63 accesses below %esp (was: Re: ntfs OOPS (2.5.63))
On Wed, 12 Mar 2003, Linus Torvalds wrote:

>
> On Wed, 12 Mar 2003, Szakacsits Szabolcs wrote:
> >
> > Some data points, in time order.
> >
> > SuSE 8.0 2.95.3-216 no bug yet [1]
> > Debian 3.0 2.95.4-14 no bug yet [1]
> > Red Hat 7.[23] 2.96-81 no bug yet [2,3]
> > Red Hat 7.[23] 2.96-98 bug introduced [2,3]
> > Mandrake 8.1 2.96-0.62mdk bug introduced [4]
> > Red Hat 7.[23] 2.96-103 bug fixed [2,3]
> > SuSE 8.0 3.0.4 (SuSE) bug fixed [1]
> > Mandrake 9.1 3.2.2-2mdk bug fixed [1]
>
> Ok. So the test really is for one particular version only.
>
> That's easy. I'll just add a
>
> #ifdef CONFIG_FRAME_POINTER
> #if __GNUC__ == 2 && __GNUC_MINOR__ == 96
> #error This compiler is not safe with frame pointers
> #endif
> #endif
>
> to <linux/compiler.h>. Yeah, it will get some fixed compilers too, but
> that's just not worth worrying about - people will just have to turn off
> CONFIG_FRAME_POINTER and be happy.

Please don't use a hammer on that tack... The Redhat errata gcc (as an
example) seems to be fine (see the nice list in the first post) and id's
as:
oddball:davidsen> gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)

People trying to get 2.5 kernels working want frame pointers and kernel
symbols so problems can be reported in a useful way. People running 2.5
kernels are probably more likely to have installed errata.

Perhaps a warning (UNSAFE?) in the config would be better, or whatever
else would avoid just blocking the ability to compile a debug kernel.

Yes, I see there's another newer yet gcc, 2.96-113, but it's been working
since -103.

--
bill davidsen <davidsen@tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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