Merge branch 'x86-acpi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 ACPI update from Peter Anvin:
 "This is a patchset which didn't make the last merge window.  It adds a
  debugging capability to feed ACPI tables via the initramfs.

  On a grander scope, it formalizes using the initramfs protocol for
  feeding arbitrary blobs which need to be accessed early to the kernel:
  they are fed first in the initramfs blob (lots of bootloaders can
  concatenate this at boot time, others can use a single file) in an
  uncompressed cpio archive using filenames starting with "kernel/".

  The ACPI maintainers requested that this patchset be fed via the x86
  tree rather than the ACPI tree as the footprint in the general x86
  code is much bigger than in the ACPI code proper."

* 'x86-acpi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  X86 ACPI: Use #ifdef not #if for CONFIG_X86 check
  ACPI: Fix build when disabled
  ACPI: Document ACPI table overriding via initrd
  ACPI: Create acpi_table_taint() function to avoid code duplication
  ACPI: Implement physical address table override
  ACPI: Store valid ACPI tables passed via early initrd in reserved memblock areas
  x86, acpi: Introduce x86 arch specific arch_reserve_mem_area() for e820 handling
  lib: Add early cpio decoder

2 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index e48cafcf92ae..bacf4b0d91f4 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1706,3 +1706,9 @@ int __acpi_release_global_lock(unsigned int *lock)
 	} while (unlikely (val != old));
 	return old & 0x1;
 }
+
+void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
+{
+	e820_add_region(addr, size, E820_ACPI);
+	update_e820();
+}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c228322ca180..23ddd558fbd5 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -952,6 +952,10 @@ void __init setup_arch(char **cmdline_p)
 
 	reserve_initrd();
 
+#if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
+	acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
+#endif
+
 	reserve_crashkernel();
 
 	vsmp_init();