x86: replace boot_ioremap() with enhanced bt_ioremap() - remove boot_ioremap()

This patch replaces boot_ioremap invokation with bt_ioremap and
removes the boot_ioremap implementation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

4 files changed, 3 insertions, 112 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 92dc919c7640..fb3eea3e38ee 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1009,12 +1009,6 @@ config IRQBALANCE
           The default yes will allow the kernel to do irq load balancing.
           Saying no will keep the kernel from doing irq load balancing.
 
-# turning this on wastes a bunch of space.
-# Summit needs it only when NUMA is on
-config BOOT_IOREMAP
-        def_bool y
-        depends on X86_32 && (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
-
 config SECCOMP
         def_bool y
         prompt "Enable seccomp to safely compute untrusted bytecode"
diff --git a/arch/x86/kernel/srat_32.c b/arch/x86/kernel/srat_32.c
index 2a8713ec0f9a..24bfd4a9e62a 100644
--- a/arch/x86/kernel/srat_32.c
+++ b/arch/x86/kernel/srat_32.c
@@ -57,8 +57,6 @@ static struct node_memory_chunk_s node_memory_chunk[MAXCHUNKS];
 static int num_memory_chunks;           /* total number of memory chunks */
 static u8 __initdata apicid_to_pxm[MAX_APICID];
 
-extern void * boot_ioremap(unsigned long, unsigned long);
-
 /* Identify CPU proximity domains */
 static void __init parse_cpu_affinity_structure(char *p)
 {
@@ -299,7 +297,7 @@ int __init get_memcfg_from_srat(void)
         }
 
         rsdt = (struct acpi_table_rsdt *)
-            boot_ioremap(rsdp->rsdt_physical_address, sizeof(struct acpi_table_rsdt));
+            bt_ioremap(rsdp->rsdt_physical_address, sizeof(struct acpi_table_rsdt));
 
         if (!rsdt) {
                 printk(KERN_WARNING
@@ -339,11 +337,11 @@ int __init get_memcfg_from_srat(void)
         for (i = 0; i < tables; i++) {
                 /* Map in header, then map in full table length. */
                 header = (struct acpi_table_header *)
-                        boot_ioremap(saved_rsdt.table.table_offset_entry[i], sizeof(struct acpi_table_header));
+                        bt_ioremap(saved_rsdt.table.table_offset_entry[i], sizeof(struct acpi_table_header));
                 if (!header)
                         break;
                 header = (struct acpi_table_header *)
-                        boot_ioremap(saved_rsdt.table.table_offset_entry[i], header->length);
+                        bt_ioremap(saved_rsdt.table.table_offset_entry[i], header->length);
                 if (!header)
                         break;
 
diff --git a/arch/x86/mm/Makefile_32 b/arch/x86/mm/Makefile_32
index be2f55160bf8..1aeba3bf34bd 100644
--- a/arch/x86/mm/Makefile_32
+++ b/arch/x86/mm/Makefile_32
@@ -8,4 +8,3 @@ obj-$(CONFIG_CPA_DEBUG) += pageattr-test.o
 obj-$(CONFIG_NUMA) += discontig_32.o
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 obj-$(CONFIG_HIGHMEM) += highmem_32.o
-obj-$(CONFIG_BOOT_IOREMAP) += boot_ioremap_32.o
diff --git a/arch/x86/mm/boot_ioremap_32.c b/arch/x86/mm/boot_ioremap_32.c
deleted file mode 100644
index 7ede1e3e1f42..000000000000
--- a/arch/x86/mm/boot_ioremap_32.c
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * arch/i386/mm/boot_ioremap.c
- *
- * Re-map functions for early boot-time before paging_init() when the
- * boot-time pagetables are still in use
- *
- * Written by Dave Hansen <haveblue@us.ibm.com>
- */
-
-
-/*
- * We need to use the 2-level pagetable functions, but CONFIG_X86_PAE
- * keeps that from happening.  If anyone has a better way, I'm listening.
- *
- * boot_pte_t is defined only if this all works correctly
- */
-
-#undef CONFIG_X86_PAE
-#undef CONFIG_PARAVIRT
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-#include <linux/init.h>
-#include <linux/stddef.h>
-
-/*
- * I'm cheating here.  It is known that the two boot PTE pages are
- * allocated next to each other.  I'm pretending that they're just
- * one big array.
- */
-
-#define BOOT_PTE_PTRS (PTRS_PER_PTE*2)
-
-static unsigned long boot_pte_index(unsigned long vaddr)
-{
-        return __pa(vaddr) >> PAGE_SHIFT;
-}
-
-static inline boot_pte_t* boot_vaddr_to_pte(void *address)
-{
-        boot_pte_t* boot_pg = (boot_pte_t*)pg0;
-        return &boot_pg[boot_pte_index((unsigned long)address)];
-}
-
-/*
- * This is only for a caller who is clever enough to page-align
- * phys_addr and virtual_source, and who also has a preference
- * about which virtual address from which to steal ptes
- */
-static void __boot_ioremap(unsigned long phys_addr, unsigned long nrpages,
-                    void* virtual_source)
-{
-        boot_pte_t* pte;
-        int i;
-        char *vaddr = virtual_source;
-
-        pte = boot_vaddr_to_pte(virtual_source);
-        for (i=0; i < nrpages; i++, phys_addr += PAGE_SIZE, pte++) {
-                set_pte(pte, pfn_pte(phys_addr>>PAGE_SHIFT, PAGE_KERNEL));
-                __flush_tlb_one((unsigned long) &vaddr[i*PAGE_SIZE]);
-        }
-}
-
-/* the virtual space we're going to remap comes from this array */
-#define BOOT_IOREMAP_PAGES 4
-#define BOOT_IOREMAP_SIZE (BOOT_IOREMAP_PAGES*PAGE_SIZE)
-static __initdata char boot_ioremap_space[BOOT_IOREMAP_SIZE]
-                       __attribute__ ((aligned (PAGE_SIZE)));
-
-/*
- * This only applies to things which need to ioremap before paging_init()
- * bt_ioremap() and plain ioremap() are both useless at this point.
- *
- * When used, we're still using the boot-time pagetables, which only
- * have 2 PTE pages mapping the first 8MB
- *
- * There is no unmap.  The boot-time PTE pages aren't used after boot.
- * If you really want the space back, just remap it yourself.
- * boot_ioremap(&ioremap_space-PAGE_OFFSET, BOOT_IOREMAP_SIZE)
- */
-__init void* boot_ioremap(unsigned long phys_addr, unsigned long size)
-{
-        unsigned long last_addr, offset;
-        unsigned int nrpages;
-
-        last_addr = phys_addr + size - 1;
-
-        /* page align the requested address */
-        offset = phys_addr & ~PAGE_MASK;
-        phys_addr &= PAGE_MASK;
-        size = PAGE_ALIGN(last_addr) - phys_addr;
-
-        nrpages = size >> PAGE_SHIFT;
-        if (nrpages > BOOT_IOREMAP_PAGES)
-                return NULL;
-
-        __boot_ioremap(phys_addr, nrpages, boot_ioremap_space);
-
-        return &boot_ioremap_space[offset];
-}