Merge tag 'ronx-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into devel-stable

generic fixmaps
ARM support for CONFIG_DEBUG_RODATA

1 files changed, 35 insertions, 4 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 9f98cec7fe1e..a7b12cb21e81 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -22,6 +22,7 @@
 #include <asm/cputype.h>
 #include <asm/sections.h>
 #include <asm/cachetype.h>
+#include <asm/fixmap.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp_plat.h>
@@ -393,6 +394,29 @@ SET_MEMORY_FN(x, pte_set_x)
 SET_MEMORY_FN(nx, pte_set_nx)
 
 /*
+ * To avoid TLB flush broadcasts, this uses local_flush_tlb_kernel_range().
+ * As a result, this can only be called with preemption disabled, as under
+ * stop_machine().
+ */
+void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
+{
+        unsigned long vaddr = __fix_to_virt(idx);
+        pte_t *pte = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+
+        /* Make sure fixmap region does not exceed available allocation. */
+        BUILD_BUG_ON(FIXADDR_START + (__end_of_fixed_addresses * PAGE_SIZE) >
+                     FIXADDR_END);
+        BUG_ON(idx >= __end_of_fixed_addresses);
+
+        if (pgprot_val(prot))
+                set_pte_at(NULL, vaddr, pte,
+                        pfn_pte(phys >> PAGE_SHIFT, prot));
+        else
+                pte_clear(NULL, vaddr, pte);
+        local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
+}
+
+/*
  * Adjust the PMD section entries according to the CPU in use.
  */
 static void __init build_mem_type_table(void)
@@ -1326,10 +1350,10 @@ static void __init kmap_init(void)
 #ifdef CONFIG_HIGHMEM
         pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE),
                 PKMAP_BASE, _PAGE_KERNEL_TABLE);
-
-        fixmap_page_table = early_pte_alloc(pmd_off_k(FIXADDR_START),
-                FIXADDR_START, _PAGE_KERNEL_TABLE);
 #endif
+
+        early_pte_alloc(pmd_off_k(FIXADDR_START), FIXADDR_START,
+                        _PAGE_KERNEL_TABLE);
 }
 
 static void __init map_lowmem(void)
@@ -1349,13 +1373,20 @@ static void __init map_lowmem(void)
                 if (start >= end)
                         break;
 
-                if (end < kernel_x_start || start >= kernel_x_end) {
+                if (end < kernel_x_start) {
                         map.pfn = __phys_to_pfn(start);
                         map.virtual = __phys_to_virt(start);
                         map.length = end - start;
                         map.type = MT_MEMORY_RWX;
 
                         create_mapping(&map);
+                } else if (start >= kernel_x_end) {
+                        map.pfn = __phys_to_pfn(start);
+                        map.virtual = __phys_to_virt(start);
+                        map.length = end - start;
+                        map.type = MT_MEMORY_RW;
+
+                        create_mapping(&map);
                 } else {
                         /* This better cover the entire kernel */
                         if (start < kernel_x_start) {