9 files changed, 124 insertions, 43 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 8a03926ea84f..555ec9714b9e 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -132,7 +132,11 @@ config ARCH_SELECT_MEMORY_MODEL
 
 config ARCH_ENABLE_MEMORY_HOTPLUG
         def_bool y
-        depends on SPARSEMEM
+        depends on SPARSEMEM && MMU
+
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+        def_bool y
+        depends on SPARSEMEM && MMU
 
 config ARCH_MEMORY_PROBE
         def_bool y
diff --git a/arch/sh/mm/cache-debugfs.c b/arch/sh/mm/cache-debugfs.c
index 0e189ccd4a77..5ba067b26591 100644
--- a/arch/sh/mm/cache-debugfs.c
+++ b/arch/sh/mm/cache-debugfs.c
@@ -130,12 +130,18 @@ static int __init cache_debugfs_init(void)
         dcache_dentry = debugfs_create_file("dcache", S_IRUSR, sh_debugfs_root,
                                             (unsigned int *)CACHE_TYPE_DCACHE,
                                             &cache_debugfs_fops);
+        if (!dcache_dentry)
+                return -ENOMEM;
         if (IS_ERR(dcache_dentry))
                 return PTR_ERR(dcache_dentry);
 
         icache_dentry = debugfs_create_file("icache", S_IRUSR, sh_debugfs_root,
                                             (unsigned int *)CACHE_TYPE_ICACHE,
                                             &cache_debugfs_fops);
+        if (!icache_dentry) {
+                debugfs_remove(dcache_dentry);
+                return -ENOMEM;
+        }
         if (IS_ERR(icache_dentry)) {
                 debugfs_remove(dcache_dentry);
                 return PTR_ERR(icache_dentry);
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index 1fdc8d90254a..5cfe08dbb59e 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -261,7 +261,7 @@ void flush_dcache_page(struct page *page)
 }
 
 /* TODO: Selective icache invalidation through IC address array.. */
-static inline void __uses_jump_to_uncached flush_icache_all(void)
+static void __uses_jump_to_uncached flush_icache_all(void)
 {
         unsigned long flags, ccr;
 
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index 64b8f7f96f9a..9f8ea3ada4db 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -16,14 +16,6 @@
 #include <asm/addrspace.h>
 #include <asm/io.h>
 
-struct dma_coherent_mem {
-        void            *virt_base;
-        u32             device_base;
-        int             size;
-        int             flags;
-        unsigned long   *bitmap;
-};
-
 void *dma_alloc_coherent(struct device *dev, size_t size,
                            dma_addr_t *dma_handle, gfp_t gfp)
 {
@@ -44,7 +36,7 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
          */
         dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
 
-        ret_nocache = ioremap_nocache(virt_to_phys(ret), size);
+        ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
         if (!ret_nocache) {
                 free_pages((unsigned long)ret, order);
                 return NULL;
@@ -58,12 +50,10 @@ EXPORT_SYMBOL(dma_alloc_coherent);
 void dma_free_coherent(struct device *dev, size_t size,
                          void *vaddr, dma_addr_t dma_handle)
 {
-        struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
         int order = get_order(size);
 
         if (!dma_release_from_coherent(dev, order, vaddr)) {
                 WARN_ON(irqs_disabled());       /* for portability */
-                BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
                 free_pages((unsigned long)phys_to_virt(dma_handle), order);
                 iounmap(vaddr);
         }
diff --git a/arch/sh/mm/fault_32.c b/arch/sh/mm/fault_32.c
index 0c776fdfbdda..898d477e47c1 100644
--- a/arch/sh/mm/fault_32.c
+++ b/arch/sh/mm/fault_32.c
@@ -2,7 +2,7 @@
  * Page fault handler for SH with an MMU.
  *
  *  Copyright (C) 1999  Niibe Yutaka
- *  Copyright (C) 2003 - 2007  Paul Mundt
+ *  Copyright (C) 2003 - 2008  Paul Mundt
  *
  *  Based on linux/arch/i386/mm/fault.c:
  *   Copyright (C) 1995  Linus Torvalds
@@ -15,6 +15,7 @@
 #include <linux/mm.h>
 #include <linux/hardirq.h>
 #include <linux/kprobes.h>
+#include <linux/marker.h>
 #include <asm/io_trapped.h>
 #include <asm/system.h>
 #include <asm/mmu_context.h>
@@ -37,10 +38,10 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
         int fault;
         siginfo_t info;
 
-#ifdef CONFIG_SH_KGDB
-        if (kgdb_nofault && kgdb_bus_err_hook)
-                kgdb_bus_err_hook();
-#endif
+        /*
+         * We don't bother with any notifier callbacks here, as they are
+         * all handled through the __do_page_fault() fast-path.
+         */
 
         tsk = current;
         si_code = SEGV_MAPERR;
@@ -61,7 +62,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
                 pgd = get_TTB() + offset;
                 pgd_k = swapper_pg_dir + offset;
 
-                /* This will never happen with the folded page table. */
                 if (!pgd_present(*pgd)) {
                         if (!pgd_present(*pgd_k))
                                 goto bad_area_nosemaphore;
@@ -71,9 +71,13 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 
                 pud = pud_offset(pgd, address);
                 pud_k = pud_offset(pgd_k, address);
-                if (pud_present(*pud) || !pud_present(*pud_k))
-                        goto bad_area_nosemaphore;
-                set_pud(pud, *pud_k);
+
+                if (!pud_present(*pud)) {
+                        if (!pud_present(*pud_k))
+                                goto bad_area_nosemaphore;
+                        set_pud(pud, *pud_k);
+                        return;
+                }
 
                 pmd = pmd_offset(pud, address);
                 pmd_k = pmd_offset(pud_k, address);
@@ -242,6 +246,25 @@ do_sigbus:
                 goto no_context;
 }
 
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
+{
+        int ret = 0;
+
+        trace_mark(kernel_arch_trap_entry, "trap_id %d ip #p%ld",
+                   trap >> 5, instruction_pointer(regs));
+
+#ifdef CONFIG_KPROBES
+        if (!user_mode(regs)) {
+                preempt_disable();
+                if (kprobe_running() && kprobe_fault_handler(regs, trap))
+                        ret = 1;
+                preempt_enable();
+        }
+#endif
+
+        return ret;
+}
+
 #ifdef CONFIG_SH_STORE_QUEUES
 /*
  * This is a special case for the SH-4 store queues, as pages for this
@@ -265,12 +288,18 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
         pmd_t *pmd;
         pte_t *pte;
         pte_t entry;
+        int ret = 0;
+
+        if (notify_page_fault(regs, lookup_exception_vector()))
+                goto out;
 
 #ifdef CONFIG_SH_KGDB
         if (kgdb_nofault && kgdb_bus_err_hook)
                 kgdb_bus_err_hook();
 #endif
 
+        ret = 1;
+
         /*
          * We don't take page faults for P1, P2, and parts of P4, these
          * are always mapped, whether it be due to legacy behaviour in
@@ -280,24 +309,23 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
                 pgd = pgd_offset_k(address);
         } else {
                 if (unlikely(address >= TASK_SIZE || !current->mm))
-                        return 1;
+                        goto out;
 
                 pgd = pgd_offset(current->mm, address);
         }
 
         pud = pud_offset(pgd, address);
         if (pud_none_or_clear_bad(pud))
-                return 1;
+                goto out;
         pmd = pmd_offset(pud, address);
         if (pmd_none_or_clear_bad(pmd))
-                return 1;
-
+                goto out;
         pte = pte_offset_kernel(pmd, address);
         entry = *pte;
         if (unlikely(pte_none(entry) || pte_not_present(entry)))
-                return 1;
+                goto out;
         if (unlikely(writeaccess && !pte_write(entry)))
-                return 1;
+                goto out;
 
         if (writeaccess)
                 entry = pte_mkdirty(entry);
@@ -314,5 +342,8 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
         set_pte(pte, entry);
         update_mmu_cache(NULL, address, entry);
 
-        return 0;
+        ret = 0;
+out:
+        trace_mark(kernel_arch_trap_exit, MARK_NOARGS);
+        return ret;
 }
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index b75a7acd62fb..2a53943924b2 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -23,7 +23,19 @@
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 pgd_t swapper_pg_dir[PTRS_PER_PGD];
-unsigned long cached_to_uncached = 0;
+
+#ifdef CONFIG_SUPERH32
+/*
+ * Handle trivial transitions between cached and uncached
+ * segments, making use of the 1:1 mapping relationship in
+ * 512MB lowmem.
+ *
+ * This is the offset of the uncached section from its cached alias.
+ * Default value only valid in 29 bit mode, in 32bit mode will be
+ * overridden in pmb_init.
+ */
+unsigned long cached_to_uncached = P2SEG - P1SEG;
+#endif
 
 #ifdef CONFIG_MMU
 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
@@ -58,9 +70,7 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
         }
 
         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
-
-        if (cached_to_uncached)
-                flush_tlb_one(get_asid(), addr);
+        flush_tlb_one(get_asid(), addr);
 }
 
 /*
@@ -113,7 +123,6 @@ void __init page_table_range_init(unsigned long start, unsigned long end,
                 if (!pmd_present(*pmd)) {
                         pte_t *pte_table;
                         pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
-                        memset(pte_table, 0, PAGE_SIZE);
                         pmd_populate_kernel(&init_mm, pmd, pte_table);
                 }
 
@@ -165,15 +174,6 @@ void __init paging_init(void)
 #ifdef CONFIG_SUPERH32
         /* Set up the uncached fixmap */
         set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
-
-#ifdef CONFIG_29BIT
-        /*
-         * Handle trivial transitions between cached and uncached
-         * segments, making use of the 1:1 mapping relationship in
-         * 512MB lowmem.
-         */
-        cached_to_uncached = P2SEG - P1SEG;
-#endif
 #endif
 }
 
@@ -265,6 +265,35 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 }
 #endif
 
+#if THREAD_SHIFT < PAGE_SHIFT
+static struct kmem_cache *thread_info_cache;
+
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
+{
+        struct thread_info *ti;
+
+        ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
+        if (unlikely(ti == NULL))
+                return NULL;
+#ifdef CONFIG_DEBUG_STACK_USAGE
+        memset(ti, 0, THREAD_SIZE);
+#endif
+        return ti;
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+        kmem_cache_free(thread_info_cache, ti);
+}
+
+void thread_info_cache_init(void)
+{
+        thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+                                              THREAD_SIZE, 0, NULL);
+        BUG_ON(thread_info_cache == NULL);
+}
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
+
 #ifdef CONFIG_MEMORY_HOTPLUG
 int arch_add_memory(int nid, u64 start, u64 size)
 {
@@ -292,4 +321,21 @@ int memory_add_physaddr_to_nid(u64 addr)
 }
 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int remove_memory(u64 start, u64 size)
+{
+        unsigned long start_pfn = start >> PAGE_SHIFT;
+        unsigned long end_pfn = start_pfn + (size >> PAGE_SHIFT);
+        int ret;
+
+        ret = offline_pages(start_pfn, end_pfn, 120 * HZ);
+        if (unlikely(ret))
+                printk("%s: Failed, offline_pages() == %d\n", __func__, ret);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
 #endif
+
+#endif /* CONFIG_MEMORY_HOTPLUG */
diff --git a/arch/sh/mm/pg-nommu.c b/arch/sh/mm/pg-nommu.c
index 677dd57f0877..91ed4e695ff7 100644
--- a/arch/sh/mm/pg-nommu.c
+++ b/arch/sh/mm/pg-nommu.c
@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <asm/page.h>
+#include <asm/uaccess.h>
 
 void copy_page(void *to, void *from)
 {
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index cef727669c87..84241676265e 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -394,6 +394,8 @@ static int __init pmb_debugfs_init(void)
 
         dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
                                      sh_debugfs_root, NULL, &pmb_debugfs_fops);
+        if (!dentry)
+                return -ENOMEM;
         if (IS_ERR(dentry))
                 return PTR_ERR(dentry);
 
diff --git a/arch/sh/mm/tlb-nommu.c b/arch/sh/mm/tlb-nommu.c
index 15111bc7ddd6..71c742b5aee3 100644
--- a/arch/sh/mm/tlb-nommu.c
+++ b/arch/sh/mm/tlb-nommu.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <asm/pgtable.h>
+#include <asm/tlbflush.h>
 
 /*
  * Nothing too terribly exciting here ..