linux-kernel - Re: [PATCH] acpi_unlazy

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Date:	Wed, 26 Mar 2008 00:35:55 -0400
From:	Len Brown <lenb@...nel.org>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] acpi_unlazy_tlb only on C3 entry

Yes, this was causeed by a merge error -- the checked-in patch
did not match the e-mailed patch.

I found that I could reproduce the error if I used patch(1)
and ignored this:

patching file drivers/acpi/processor_idle.c
Hunk #1 succeeded at 534 with fuzz 2 (offset 4 lines).
Hunk #2 succeeded at 1420 (offset -66 lines).

The 2nd hunk is what failed:
Index: linux-2.6.24-rc/drivers/acpi/processor_idle.c
===================================================================
--- linux-2.6.24-rc.orig/drivers/acpi/processor_idle.c
+++ linux-2.6.24-rc/drivers/acpi/processor_idle.c
@@ -530,6 +530,7 @@ static void acpi_processor_idle(void)
                break;

        case ACPI_STATE_C3:
+               acpi_unlazy_tlb(smp_processor_id());
                /*
                 * disable bus master
                 * bm_check implies we need ARB_DIS
@@ -1485,6 +1486,7 @@ static int acpi_idle_enter_bm(struct cpu
                return 0;
        }

+       acpi_unlazy_tlb(smp_processor_id());
        /*
         * Must be done before busmaster disable as we might need to
         * access HPET !


As this touches just acpi/processor_idle.c, I'll send this with
a batch of acpi patches I've got.

applied.

thanks,
-Len

On Monday 24 March 2008, Venki Pallipadi wrote:
> 
> Earlier patch here
> http://ussg.iu.edu/hypermail/linux/kernel/0712.2/1451.html
> was intending to add acpi_unlazy_tlb() to acpi_idle_enter_bm() routine which is
> used for C3 entry. But, some where along the way the call got added to
> acpi_idle_enter_simple() (which is C2 entry routine), probably due to identical
> context in that function. Move it back to acpi_idle_enter_bm().
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> 
> ---
>  drivers/acpi/processor_idle.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6-x86.git/drivers/acpi/processor_idle.c
> ===================================================================
> --- linux-2.6-x86.git.orig/drivers/acpi/processor_idle.c	2008-03-21 08:28:47.000000000 -0700
> +++ linux-2.6-x86.git/drivers/acpi/processor_idle.c	2008-03-24 06:43:01.000000000 -0700
> @@ -1487,7 +1487,6 @@ static int acpi_idle_enter_simple(struct
>  		return 0;
>  	}
>  
> -	acpi_unlazy_tlb(smp_processor_id());
>  	/*
>  	 * Must be done before busmaster disable as we might need to
>  	 * access HPET !
> @@ -1577,6 +1576,8 @@ static int acpi_idle_enter_bm(struct cpu
>  		return 0;
>  	}
>  
> +	acpi_unlazy_tlb(smp_processor_id());
> +
>  	/* Tell the scheduler that we are going deep-idle: */
>  	sched_clock_idle_sleep_event();
>  	/*
> --
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