Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6

* master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6:
  [SPARC64]: Fix D-cache corruption in mremap
  [SPARC64]: Make smp_processor_id() functional before start_kernel()

6 files changed, 71 insertions, 36 deletions

diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 3eadac5e171e..31c5892f5acc 100644
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -10,6 +10,7 @@
 #include <linux/config.h>
 #include <linux/version.h>
 #include <linux/errno.h>
+#include <linux/threads.h>
 #include <asm/thread_info.h>
 #include <asm/asi.h>
 #include <asm/pstate.h>
@@ -493,6 +494,35 @@ tlb_fixup_done:
         call    prom_init
          mov    %l7, %o0                        ! OpenPROM cif handler
 
+        /* Initialize current_thread_info()->cpu as early as possible.
+         * In order to do that accurately we have to patch up the get_cpuid()
+         * assembler sequences.  And that, in turn, requires that we know
+         * if we are on a Starfire box or not.  While we're here, patch up
+         * the sun4v sequences as well.
+         */
+        call    check_if_starfire
+         nop
+        call    per_cpu_patch
+         nop
+        call    sun4v_patch
+         nop
+
+#ifdef CONFIG_SMP
+        call    hard_smp_processor_id
+         nop
+        cmp     %o0, NR_CPUS
+        blu,pt  %xcc, 1f
+         nop
+        call    boot_cpu_id_too_large
+         nop
+        /* Not reached... */
+
+1:
+#else
+        mov     0, %o0
+#endif
+        stb     %o0, [%g6 + TI_CPU]
+
         /* Off we go.... */
         call    start_kernel
          nop
diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 005167f82419..9cf1c88cd774 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -220,7 +220,7 @@ char reboot_command[COMMAND_LINE_SIZE];
 
 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 
-static void __init per_cpu_patch(void)
+void __init per_cpu_patch(void)
 {
         struct cpuid_patch_entry *p;
         unsigned long ver;
@@ -280,7 +280,7 @@ static void __init per_cpu_patch(void)
         }
 }
 
-static void __init sun4v_patch(void)
+void __init sun4v_patch(void)
 {
         struct sun4v_1insn_patch_entry *p1;
         struct sun4v_2insn_patch_entry *p2;
@@ -315,6 +315,15 @@ static void __init sun4v_patch(void)
         }
 }
 
+#ifdef CONFIG_SMP
+void __init boot_cpu_id_too_large(int cpu)
+{
+        prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
+                    cpu, NR_CPUS);
+        prom_halt();
+}
+#endif
+
 void __init setup_arch(char **cmdline_p)
 {
         /* Initialize PROM console and command line. */
@@ -332,16 +341,6 @@ void __init setup_arch(char **cmdline_p)
         conswitchp = &prom_con;
 #endif
 
-        /* Work out if we are starfire early on */
-        check_if_starfire();
-
-        /* Now we know enough to patch the get_cpuid sequences
-         * used by trap code.
-         */
-        per_cpu_patch();
-
-        sun4v_patch();
-
         boot_flags_init(*cmdline_p);
 
         idprom_init();
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 90eaca3ec9a6..4e8cd79156e0 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1264,7 +1264,6 @@ void __init smp_tick_init(void)
         boot_cpu_id = hard_smp_processor_id();
         current_tick_offset = timer_tick_offset;
 
-        cpu_set(boot_cpu_id, cpu_online_map);
         prof_counter(boot_cpu_id) = prof_multiplier(boot_cpu_id) = 1;
 }
 
@@ -1345,18 +1344,6 @@ void __init smp_setup_cpu_possible_map(void)
 
 void __devinit smp_prepare_boot_cpu(void)
 {
-        int cpu = hard_smp_processor_id();
-
-        if (cpu >= NR_CPUS) {
-                prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
-                prom_halt();
-        }
-
-        current_thread_info()->cpu = cpu;
-        __local_per_cpu_offset = __per_cpu_offset(cpu);
-
-        cpu_set(smp_processor_id(), cpu_online_map);
-        cpu_set(smp_processor_id(), phys_cpu_present_map);
 }
 
 int __devinit __cpu_up(unsigned int cpu)
@@ -1433,4 +1420,7 @@ void __init setup_per_cpu_areas(void)
 
         for (i = 0; i < NR_CPUS; i++, ptr += size)
                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
+
+        /* Setup %g5 for the boot cpu.  */
+        __local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
 }
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 358e4d309ceb..c2059a3a0621 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -159,17 +159,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 #define lazy_mmu_prot_update(pte)       do { } while (0)
 #endif
 
-#ifndef __HAVE_ARCH_MULTIPLE_ZERO_PAGE
+#ifndef __HAVE_ARCH_MOVE_PTE
 #define move_pte(pte, prot, old_addr, new_addr) (pte)
-#else
-#define move_pte(pte, prot, old_addr, new_addr)                         \
-({                                                                      \
-        pte_t newpte = (pte);                                           \
-        if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&              \
-                        pte_page(pte) == ZERO_PAGE(old_addr))           \
-                newpte = mk_pte(ZERO_PAGE(new_addr), (prot));           \
-        newpte;                                                         \
-})
 #endif
 
 /*
diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 174a3cda8c26..f80fe75c7800 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -70,7 +70,15 @@ extern unsigned long zero_page_mask;
 #define ZERO_PAGE(vaddr) \
         (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
 
-#define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
+#define __HAVE_ARCH_MOVE_PTE
+#define move_pte(pte, prot, old_addr, new_addr)                         \
+({                                                                      \
+        pte_t newpte = (pte);                                           \
+        if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&              \
+                        pte_page(pte) == ZERO_PAGE(old_addr))           \
+                newpte = mk_pte(ZERO_PAGE(new_addr), (prot));           \
+        newpte;                                                         \
+})
 
 extern void paging_init(void);
 
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h
index c44e7466534e..cd464f469a2c 100644
--- a/include/asm-sparc64/pgtable.h
+++ b/include/asm-sparc64/pgtable.h
@@ -689,6 +689,23 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *p
 #define pte_clear(mm,addr,ptep)         \
         set_pte_at((mm), (addr), (ptep), __pte(0UL))
 
+#ifdef DCACHE_ALIASING_POSSIBLE
+#define __HAVE_ARCH_MOVE_PTE
+#define move_pte(pte, prot, old_addr, new_addr)                         \
+({                                                                      \
+        pte_t newpte = (pte);                                           \
+        if (tlb_type != hypervisor && pte_present(pte)) {               \
+                unsigned long this_pfn = pte_pfn(pte);                  \
+                                                                        \
+                if (pfn_valid(this_pfn) &&                              \
+                    (((old_addr) ^ (new_addr)) & (1 << 13)))            \
+                        flush_dcache_page_all(current->mm,              \
+                                              pfn_to_page(this_pfn));   \
+        }                                                               \
+        newpte;                                                         \
+})
+#endif
+
 extern pgd_t swapper_pg_dir[2048];
 extern pmd_t swapper_low_pmd_dir[2048];