Re: [PATCH] 2.4.16 kernel/printk.c (per processorinitializationcheck)

Manfred Spraul (manfred@colorfullife.com)
Sat, 8 Dec 2001 18:36:51 +0100

Alan Cox wrote:
> x86_udelay_tsc wont have been set at that point so the main timer is still
> being used.

No. x86_udelay_tsc is initialized by time_init(), and time_init() is called before
smp_init(). The udelay implementation only multiplies with loops_per_jiffy,
therefore there is no oops on i386.

But could oops if the bios disables the TSC instruction - the first printk on
the secondary cpu happens before

clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE)

--
    Manfred


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