* Why BOOT_PRINTK_DELAY "may adversely affect SMP systems"?
@ 2011-10-20 9:24 snakky.zhang
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From: snakky.zhang @ 2011-10-20 9:24 UTC (permalink / raw)
To: linux-kernel
Hi experts,
I noticed there is an kernel option called BOOT_PRINTK_DELAY and some
warning messages in the Kconfig file as below:
NOTE: Using this option may adversely affect SMP systems. I.e.,
processors other than the first one may not boot up. BOOT_PRINTK_DELAY
also may cause DETECT_SOFTLOCKUP to detect what it believes to be lockup
conditions.
As my understanding, this do nothing but just let the very CPU loop for
a while and shouldn't cause any affect on the boot process. So I can
hardly understand WHY it may cause "processors other than the first one
may not boot up"? If this issue can be avoid/fixed?
Thanks a lot!
Snakky
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2011-10-20 9:24 Why BOOT_PRINTK_DELAY "may adversely affect SMP systems"? snakky.zhang
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