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ACPI: basic initramfs DSDT override support

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The basics of DSDT from initramfs. In case this option is selected,
populate_rootfs() is called a bit earlier to have the initramfs content
available during ACPI initialization.

This is a very similar path to the one available at
http://gaugusch.at/kernel.shtml but with some update in the
documentation, default set to No and the change of populate_rootfs() the
"Jeff Mahony way" (which avoids reading the initramfs twice).

Signed-off-by: Thomas Renninger <[email protected]>
Signed-off-by: Eric Piel <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Markus Gaugusch 2008-02-05 00:04:06 +01:00 • committed by Len Brown
commit 71fc47a9ad
5 changed files with 199 additions and 5 deletions
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7
init/main.c
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@ -102,6 +102,12 @@ static inline void mark_rodata_ro(void) { }
extern void tc_init(void);
#endif
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
extern int populate_rootfs(void);
#else
static inline void populate_rootfs(void) {}
#endif
enum system_states system_state;
EXPORT_SYMBOL(system_state);
@ -648,6 +654,7 @@ asmlinkage void __init start_kernel(void)
check_bugs();
populate_rootfs(); /* For DSDT override from initramfs */
acpi_early_init(); /* before LAPIC and SMP init */
/* Do the rest non-__init'ed, we're now alive */