Merge branch 'kexec/idmap' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into devel-stable

5 files changed, 24 insertions, 53 deletions

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 08c82fd844a8..fb2945be5a51 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -170,11 +170,11 @@ __create_page_tables:
          * Create identity mapping to cater for __enable_mmu.
          * This identity mapping will be removed by paging_init().
          */
-        adr     r0, __enable_mmu_loc
+        adr     r0, __turn_mmu_on_loc
         ldmia   r0, {r3, r5, r6}
         sub     r0, r0, r3                      @ virt->phys offset
-        add     r5, r5, r0                      @ phys __enable_mmu
-        add     r6, r6, r0                      @ phys __enable_mmu_end
+        add     r5, r5, r0                      @ phys __turn_mmu_on
+        add     r6, r6, r0                      @ phys __turn_mmu_on_end
         mov     r5, r5, lsr #SECTION_SHIFT
         mov     r6, r6, lsr #SECTION_SHIFT
 
@@ -287,10 +287,10 @@ __create_page_tables:
 ENDPROC(__create_page_tables)
         .ltorg
         .align
-__enable_mmu_loc:
+__turn_mmu_on_loc:
         .long   .
-        .long   __enable_mmu
-        .long   __enable_mmu_end
+        .long   __turn_mmu_on
+        .long   __turn_mmu_on_end
 
 #if defined(CONFIG_SMP)
         __CPUINIT
@@ -398,15 +398,17 @@ ENDPROC(__enable_mmu)
  * other registers depend on the function called upon completion
  */
         .align  5
-__turn_mmu_on:
+        .pushsection    .idmap.text, "ax"
+ENTRY(__turn_mmu_on)
         mov     r0, r0
         mcr     p15, 0, r0, c1, c0, 0           @ write control reg
         mrc     p15, 0, r3, c0, c0, 0           @ read id reg
         mov     r3, r3
         mov     r3, r13
         mov     pc, r3
-__enable_mmu_end:
+__turn_mmu_on_end:
 ENDPROC(__turn_mmu_on)
+        .popsection
 
 
 #ifdef CONFIG_SMP_ON_UP
diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 020e99c845e7..9e64231c8cfe 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -54,6 +54,7 @@ ENDPROC(cpu_suspend_abort)
  * r0 = control register value
  */
         .align  5
+        .pushsection    .idmap.text,"ax"
 ENTRY(cpu_resume_mmu)
         ldr     r3, =cpu_resume_after_mmu
         mcr     p15, 0, r0, c1, c0, 0   @ turn on MMU, I-cache, etc
@@ -62,6 +63,7 @@ ENTRY(cpu_resume_mmu)
         mov     r0, r0
         mov     pc, r3                  @ jump to virtual address
 ENDPROC(cpu_resume_mmu)
+        .popsection
 cpu_resume_after_mmu:
         bl      cpu_init                @ restore the und/abt/irq banked regs
         mov     r0, #0                  @ return zero on success
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index ef5640b9e218..76ff28d87bf3 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -31,6 +31,7 @@
 #include <asm/cpu.h>
 #include <asm/cputype.h>
 #include <asm/exception.h>
+#include <asm/idmap.h>
 #include <asm/topology.h>
 #include <asm/mmu_context.h>
 #include <asm/pgtable.h>
@@ -61,7 +62,6 @@ int __cpuinit __cpu_up(unsigned int cpu)
 {
         struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
         struct task_struct *idle = ci->idle;
-        pgd_t *pgd;
         int ret;
 
         /*
@@ -84,29 +84,11 @@ int __cpuinit __cpu_up(unsigned int cpu)
         }
 
         /*
-         * Allocate initial page tables to allow the new CPU to
-         * enable the MMU safely.  This essentially means a set
-         * of our "standard" page tables, with the addition of
-         * a 1:1 mapping for the physical address of the kernel.
-         */
-        pgd = pgd_alloc(&init_mm);
-        if (!pgd)
-                return -ENOMEM;
-
-        if (PHYS_OFFSET != PAGE_OFFSET) {
-#ifndef CONFIG_HOTPLUG_CPU
-                identity_mapping_add(pgd, __pa(__init_begin), __pa(__init_end));
-#endif
-                identity_mapping_add(pgd, __pa(_stext), __pa(_etext));
-                identity_mapping_add(pgd, __pa(_sdata), __pa(_edata));
-        }
-
-        /*
          * We need to tell the secondary core where to find
          * its stack and the page tables.
          */
         secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
-        secondary_data.pgdir = virt_to_phys(pgd);
+        secondary_data.pgdir = virt_to_phys(idmap_pgd);
         secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir);
         __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data));
         outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1));
@@ -142,16 +124,6 @@ int __cpuinit __cpu_up(unsigned int cpu)
         secondary_data.stack = NULL;
         secondary_data.pgdir = 0;
 
-        if (PHYS_OFFSET != PAGE_OFFSET) {
-#ifndef CONFIG_HOTPLUG_CPU
-                identity_mapping_del(pgd, __pa(__init_begin), __pa(__init_end));
-#endif
-                identity_mapping_del(pgd, __pa(_stext), __pa(_etext));
-                identity_mapping_del(pgd, __pa(_sdata), __pa(_edata));
-        }
-
-        pgd_free(&init_mm, pgd);
-
         return ret;
 }
 
diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index 93a22d282c16..1794cc3b0f18 100644
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -1,13 +1,12 @@
 #include <linux/init.h>
 
+#include <asm/idmap.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 #include <asm/memory.h>
 #include <asm/suspend.h>
 #include <asm/tlbflush.h>
 
-static pgd_t *suspend_pgd;
-
 extern int __cpu_suspend(unsigned long, int (*)(unsigned long));
 extern void cpu_resume_mmu(void);
 
@@ -21,7 +20,7 @@ void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
         *save_ptr = virt_to_phys(ptr);
 
         /* This must correspond to the LDM in cpu_resume() assembly */
-        *ptr++ = virt_to_phys(suspend_pgd);
+        *ptr++ = virt_to_phys(idmap_pgd);
         *ptr++ = sp;
         *ptr++ = virt_to_phys(cpu_do_resume);
 
@@ -42,7 +41,7 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
         struct mm_struct *mm = current->active_mm;
         int ret;
 
-        if (!suspend_pgd)
+        if (!idmap_pgd)
                 return -EINVAL;
 
         /*
@@ -59,14 +58,3 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
 
         return ret;
 }
-
-static int __init cpu_suspend_init(void)
-{
-        suspend_pgd = pgd_alloc(&init_mm);
-        if (suspend_pgd) {
-                unsigned long addr = virt_to_phys(cpu_resume_mmu);
-                identity_mapping_add(suspend_pgd, addr, addr + SECTION_SIZE);
-        }
-        return suspend_pgd ? 0 : -ENOMEM;
-}
-core_initcall(cpu_suspend_init);
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 20b3041e0860..f76e75548670 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -13,6 +13,12 @@
         *(.proc.info.init)                                              \
         VMLINUX_SYMBOL(__proc_info_end) = .;
 
+#define IDMAP_TEXT                                                      \
+        ALIGN_FUNCTION();                                               \
+        VMLINUX_SYMBOL(__idmap_text_start) = .;                         \
+        *(.idmap.text)                                                  \
+        VMLINUX_SYMBOL(__idmap_text_end) = .;
+
 #ifdef CONFIG_HOTPLUG_CPU
 #define ARM_CPU_DISCARD(x)
 #define ARM_CPU_KEEP(x)         x
@@ -92,6 +98,7 @@ SECTIONS
                         SCHED_TEXT
                         LOCK_TEXT
                         KPROBES_TEXT
+                        IDMAP_TEXT
 #ifdef CONFIG_MMU
                         *(.fixup)
 #endif