ACPI: Remove ACPI_CUSTOM_DSDT_INITRD option

This essentially reverts commit 71fc47a9adf8ee89e5c96a47222915c5485ac437
("ACPI: basic initramfs DSDT override support"), because the code simply
isn't ready.

It did ugly things to the init sequence to populate the rootfs image
early, but that just ended up showing other problems with the whole
approach.  The fact is, the VFS layer simply isn't initialized this
early, and the relevant ACPI code should either run much later, or this
shouldn't be done at all.

For 2.6.25, we'll just pick the latter option.  We can revisit this
concept later if necessary.

Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Tilman Schmidt <tilman@imap.cc>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Eric Piel <eric.piel@tremplin-utc.net>
Cc: Len Brown <len.brown@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Markus Gaugusch <dsdt@gaugusch.at>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 14 deletions

diff --git a/init/initramfs.c b/init/initramfs.c
index c0b1e0533d80..d53fee8d8604 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -538,7 +538,7 @@ skip:
         initrd_end = 0;
 }
 
-int __init populate_rootfs(void)
+static int __init populate_rootfs(void)
 {
         char *err = unpack_to_rootfs(__initramfs_start,
                          __initramfs_end - __initramfs_start, 0);
@@ -577,10 +577,4 @@ int __init populate_rootfs(void)
         }
         return 0;
 }
-#ifndef CONFIG_ACPI_CUSTOM_DSDT_INITRD
-/*
- * if this option is enabled, populate_rootfs() is called _earlier_ in the
- * boot sequence. This insures that the ACPI initialisation can find the file.
- */
 rootfs_initcall(populate_rootfs);
-#endif
diff --git a/init/main.c b/init/main.c
index fbb0167c6b8a..99ce94930b09 100644
--- a/init/main.c
+++ b/init/main.c
@@ -102,12 +102,6 @@ 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);
 
@@ -650,7 +644,6 @@ 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 */