diff options
| author | Len Brown <len.brown@intel.com> | 2007-07-26 04:50:06 (GMT) |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-07-26 04:50:06 (GMT) |
| commit | 67effe8fff32f60bdf51cba484766ba6003005bb (patch) | |
| tree | 8f8bf5ea5d7ddd1679c8a7d46c7219770d7cdaf8 /drivers/acpi/tables/tbxface.c | |
| parent | e4903fb59590f86190280a549420f6cb85bd7f7e (diff) | |
| download | linux-fsl-qoriq-67effe8fff32f60bdf51cba484766ba6003005bb.tar.xz | |
ACPI: add "acpi_no_auto_ssdt" bootparam
"acpi_no_auto_ssdt" prevents Linux from automatically loading
all the SSDTs listed in the RSDT/XSDT.
This is needed for debugging. In particular,
it allows a DSDT override to optionally be a DSDT+SSDT override.
http://bugzilla.kernel.org/show_bug.cgi?id=3774
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/tables/tbxface.c')
| -rw-r--r-- | drivers/acpi/tables/tbxface.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/acpi/tables/tbxface.c b/drivers/acpi/tables/tbxface.c index 5b302c4..a9e3331 100644 --- a/drivers/acpi/tables/tbxface.c +++ b/drivers/acpi/tables/tbxface.c @@ -52,6 +52,8 @@ ACPI_MODULE_NAME("tbxface") /* Local prototypes */ static acpi_status acpi_tb_load_namespace(void); +static int no_auto_ssdt; + /******************************************************************************* * * FUNCTION: acpi_allocate_root_table @@ -536,6 +538,10 @@ static acpi_status acpi_tb_load_namespace(void) ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS")); acpi_tb_print_table_header(0, table); + + if (no_auto_ssdt == 0) { + printk(KERN_WARNING "ACPI: DSDT override uses original SSDTs unless \"acpi_no_auto_ssdt\""); + } } status = @@ -577,6 +583,11 @@ static acpi_status acpi_tb_load_namespace(void) continue; } + if (no_auto_ssdt) { + printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n"); + continue; + } + /* Ignore errors while loading tables, get as many as possible */ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); @@ -622,3 +633,15 @@ acpi_status acpi_load_tables(void) } ACPI_EXPORT_SYMBOL(acpi_load_tables) + + +static int __init acpi_no_auto_ssdt_setup(char *s) { + + printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n"); + + no_auto_ssdt = 1; + + return 1; +} + +__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); |