In article <Pine.LNX.4.10.10107181347030.16710-100000@l> you write:
>
> I don't know whether cpuid_eax (2.4.7pre) should preserve the
>registers changed from cpuid
It should. It has the proper "this instruction assigned values to these
registers" stuff, so gcc should know which ones change.
> but I have an oops on boot with 2.4.7pre7 in
>squash_the_stupid_serial_number where cpuid_eax changes ebx and the
>parameter "c" is loaded with "Genu". The following change fixes the
>problem:
Interesting. Can you do the following:
- tell us your compiler version
- do a "make arch/i386/kernel/setup.s" both ways, and show what
squash_the_stupid_serial_number() looks like.
- fix _all_ the "cpuid*()" functions to have
:"0" (op)
instead of their current incorrect
:"a" (op)
(we're supposed to explicitly tell the compiler that the first input
is the same as the first output)
- see if that makes any difference to the assembler output.
In any case it does sound like a compiler bug, but it would be good to
have a workaround. But it would also be good to have a more complete
dump of the oops in question to see more about what is going on..
Thanks,
Linus
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This archive was generated by hypermail 2b29 : Mon Jul 23 2001 - 21:00:10 EST