[POWERPC] Port fixmap from x86 and use for kmap_atomic

The fixmap code from x86 allows us to have compile time virtual addresses
that we change the physical addresses of at run time.

This is useful for applications like kmap_atomic, PCI config that is done
via direct memory map, kexec/kdump.

We got ride of CONFIG_HIGHMEM_START as we can now determine a more optimal
location for PKMAP_BASE based on where the fixmap addresses start and
working back from there.

Additionally, the kmap code in asm-powerpc/highmem.h always had debug
enabled.  Moved to using CONFIG_DEBUG_HIGHMEM to determine if we should
have the extra debug checking.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 0 insertions, 14 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index fdc755a05f70..20f45a8b87e3 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -626,20 +626,6 @@ config ADVANCED_OPTIONS
 comment "Default settings for advanced configuration options are used"
         depends on !ADVANCED_OPTIONS
 
-config HIGHMEM_START_BOOL
-        bool "Set high memory pool address"
-        depends on ADVANCED_OPTIONS && HIGHMEM
-        help
-          This option allows you to set the base address of the kernel virtual
-          area used to map high memory pages.  This can be useful in
-          optimizing the layout of kernel virtual memory.
-
-          Say N here unless you know what you are doing.
-
-config HIGHMEM_START
-        hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
-        default "0xfe000000"
-
 config LOWMEM_SIZE_BOOL
         bool "Set maximum low memory"
         depends on ADVANCED_OPTIONS