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ACPI: Add "acpi_no_initrd_override" kernel parameter

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The acpi_no_initrd_override parameter permits to disable the load of an ACPI
table from the initramfs.

Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Éric Piel 2008-02-05 00:04:58 +01:00 committed by Len Brown
parent 6ed31e92e9
commit 9cbc796028
2 changed files with 18 additions and 1 deletions
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3
Documentation/kernel-parameters.txt
View file

@ -175,6 +175,9 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT
acpi_no_initrd_override [KNL,ACPI]
Disable loading custom ACPI tables from the initramfs
acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS
Format: To spoof as Windows 98: ="Microsoft Windows"

16
drivers/acpi/osl.c
View file

@ -77,6 +77,10 @@ static struct workqueue_struct *kacpi_notify_wq;
#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
static char osi_additional_string[OSI_STRING_LENGTH_MAX];
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
static int acpi_no_initrd_override;
#endif
/*
* "Ode to _OSI(Linux)"
*
@ -386,7 +390,8 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
*new_table = (struct acpi_table_header *)AmlCode;
#endif
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
if (strncmp(existing_table->signature, "DSDT", 4) == 0) {
if ((strncmp(existing_table->signature, "DSDT", 4) == 0) &&
!acpi_no_initrd_override) {
struct acpi_table_header *initrd_table = acpi_find_dsdt_initrd();
if (initrd_table)
*new_table = initrd_table;
@ -402,6 +407,15 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
return AE_OK;
}
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
int __init acpi_no_initrd_override_setup(char *s)
{
acpi_no_initrd_override = 1;
return 1;
}
__setup("acpi_no_initrd_override", acpi_no_initrd_override_setup);
#endif
static irqreturn_t acpi_irq(int irq, void *dev_id)
{
return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;