Re: Having linking problems with atomic_inc(), atomic_dec_and_test()in user app, help!

Michael Schmitz wrote:

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Also, what does "relocation truncated to fit: R_PPC_REL24

atomic_inc(atomic_t

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*)" mean?

About as much as 'unresolved external reference'. atomic_inc isn't

defined

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in the scope of your code. Look at the kernel headers; it might be

inside

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#ifdef __KRENEL__ (actually it is).

I see... when I wrote the code using Red Hat, this was not the case.  I
assumed
things would be similar under all Linuxes... apparently a bad
assumption.

It's a kernel or libc header issue - what kernel/libc version was that
on? As far as I can see atomic operations are exported to user programs
except on ppc (not ppc64), mips*, arm and sparc. At least in one case it's
obvious why: MIPS needs to protect against interrupts to guarantee
atomicity.
Another corner case seems to be IBM 405 processors that use what I think
is a privileged instruction as well in order to work around a hardware
bug.

The dcbt instruction (the workaround) should not be privileged.

< stuff deleted >

-Frank
--
Frank Rowand [off-list ref]
MontaVista Software, Inc

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