Re: [PATCH] don't use flush_tlb_all in suspend time

Hi!

> flush_tlb_all uses on_each_cpu, which will disable/enable interrupt.
> In suspend/resume time, this will make interrupt wrongly enabled.

> diff -puN arch/i386/mm/init.c~flush_tlb_all_check arch/i386/mm/init.c
> --- linux-2.6.17-rc3/arch/i386/mm/init.c~flush_tlb_all_check	2006-04-29 08:47:05.000000000 +0800
> +++ linux-2.6.17-rc3-root/arch/i386/mm/init.c	2006-04-29 08:48:15.000000000 +0800
> @@ -420,7 +420,10 @@ void zap_low_mappings (void)
>  #else
>  		set_pgd(swapper_pg_dir+i, __pgd(0));
>  #endif
> -	flush_tlb_all();
> +	if (cpus_weight(cpu_online_map) == 1)
> +		local_flush_tlb();
> +	else
> +		flush_tlb_all();
>  }
>

Either it is okay to enable interrupts here -> unneccessary and ugly
test, or it is not, and then we are broken in SMP case.

							Pavel
-- 
Thanks, Sharp!
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: [PATCH] don't use flush_tlb_all in suspend time
    • From: Shaohua Li <[email protected]>

• References:
  • [PATCH] don't use flush_tlb_all in suspend time
    • From: Shaohua Li <[email protected]>

• Prev by Date: Re: World writable tarballs
• Next by Date: Re: [PATCH] don't use flush_tlb_all in suspend time
• Previous by thread: [PATCH] don't use flush_tlb_all in suspend time
• Next by thread: Re: [PATCH] don't use flush_tlb_all in suspend time
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]