John Levon (moz@compsoc.man.ac.uk)
Wed, 26 Sep 2001 15:01:50 +0100

My module needs use of the local APIC for performance counter setup.

Currently I am detecting the various ways it can be enabled/disabled as follows :

static int __init apic_needs_setup(void)
/* if enabled, the kernel has already set it up */
0 &&
/* 2.4.10 and above do the necessary setup */
0 &&
/* otherwise, we detect SMP hardware via the MP table */
!smp_hardware &&
#endif /* 2.4.10 */
#endif /* CONFIG_X86_UP_APIC */
smp_num_cpus == 1;

this is obviously ugly, and more importantly fails when passing noapic,nosmp etc.
as boot options.

How would people feel about exporting a flag for local APIC setup that modules can look at ?
If it's OK I'll send a patch.

My module is not the only one that needs this (e.g. the APIC timers module)


"Khendon's Law: If the same point is made twice by the same person,
 the thread is over."
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/