On 07/27/2010 11:08 PM, Yinghai Lu wrote: > > for example: > high/low allocation, from first kernel to kexec second kernel, always work fine except system with Qlogic card. > because Qlogic card is using main RAM as EFT etc for card's FW log trace. second kernel have not idea that those RAM > is used by first kernel for that purpose. that the CARD still use that between two kernels. > second kernel could have crash it try to use those ram. > Uhm, no. That's a bug in the Qlogic driver not shutting the card down cleanly. Hacking around that in memory allocation order is braindamaged in the extreme. kexec *cannot* be safe in any way if we don't shut down pending DMA, and what you describe above is DMA. > low/high allocation seems to be safe, second kernel can slip to boot fine. Low to high is just broken. Low memory is a special, desirable resource, and we should minimize the use of it. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
