[patch 5/6] Altix: reinitialize acpi tables

[patch 5/6] Altix: reinitialize acpi tables

[akpm]

From: John Keller <jpk@sgi.com>

To provide compatibilty with SN kernels that do and do not have ACPI IO
support, the SN PROM must build different versions of some ACPI tables
based on which kernel is booting.  As such, the tables may have to change
at kernel boot time.  By default, prior to kernel boot, the PROM builds an
empty DSDT (header only) and no SSDTs.  If an ACPI capable kernel boots,
the kernel will notify the PROM, at platform setup time, and the PROM will
build full DSDT and SSDT tables.

With the latest changes to acpi_table_init(), the table lengths are saved,
and when our PROM changes them, the changes are not seen, and the kernel
will crash on boot.  Because of issues with kexec support, we are not able
to create the tables prior to acpi_table_init().  As a result, we are
making a second call to acpi_table_init() to process the rebuilt DSDT and
SSDTs.

Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/ia64/sn/kernel/setup.c |    2 ++
 1 file changed, 2 insertions(+)

diff -puN arch/ia64/sn/kernel/setup.c~altix-reinitialize-acpi-tables arch/ia64/sn/kernel/setup.c
--- a/arch/ia64/sn/kernel/setup.c~altix-reinitialize-acpi-tables
+++ a/arch/ia64/sn/kernel/setup.c
@@ -54,6 +54,8 @@
 #include "xtalk/hubdev.h"
 #include <asm/sn/klconfig.h>
 
+	/* Load the new DSDT and SSDT tables into the global table list. */
+ 	acpi_table_init();
 
 DEFINE_PER_CPU(struct pda_s, pda_percpu);
 
_

Re: [patch 5/6] Altix: reinitialize acpi tables

[Len Brown]

Andrew,
This patch is munged -- please remove it from mm.

The correct patch is already present in git-acpi.patch,
which perhaps is why patch munged it on entry into mm.

thanks,
-Len


On Tuesday 06 March 2007 05:29, akpm@linux-foundation.org wrote:
> From: John Keller <jpk@sgi.com>
> 
> To provide compatibilty with SN kernels that do and do not have ACPI IO
> support, the SN PROM must build different versions of some ACPI tables
> based on which kernel is booting.  As such, the tables may have to change
> at kernel boot time.  By default, prior to kernel boot, the PROM builds an
> empty DSDT (header only) and no SSDTs.  If an ACPI capable kernel boots,
> the kernel will notify the PROM, at platform setup time, and the PROM will
> build full DSDT and SSDT tables.
> 
> With the latest changes to acpi_table_init(), the table lengths are saved,
> and when our PROM changes them, the changes are not seen, and the kernel
> will crash on boot.  Because of issues with kexec support, we are not able
> to create the tables prior to acpi_table_init().  As a result, we are
> making a second call to acpi_table_init() to process the rebuilt DSDT and
> SSDTs.
> 
> Signed-off-by: John Keller <jpk@sgi.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
> 
>  arch/ia64/sn/kernel/setup.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff -puN arch/ia64/sn/kernel/setup.c~altix-reinitialize-acpi-tables arch/ia64/sn/kernel/setup.c
> --- a/arch/ia64/sn/kernel/setup.c~altix-reinitialize-acpi-tables
> +++ a/arch/ia64/sn/kernel/setup.c
> @@ -54,6 +54,8 @@
>  #include "xtalk/hubdev.h"
>  #include <asm/sn/klconfig.h>
>  
> +	/* Load the new DSDT and SSDT tables into the global table list. */
> + 	acpi_table_init();
>  
>  DEFINE_PER_CPU(struct pda_s, pda_percpu);
>  
> _
> -
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>