6 files changed, 46 insertions, 75 deletions

diff --git a/arch/arc/include/asm/irqflags.h b/arch/arc/include/asm/irqflags.h
index ccd84806b62f..eac071668201 100644
--- a/arch/arc/include/asm/irqflags.h
+++ b/arch/arc/include/asm/irqflags.h
@@ -39,7 +39,7 @@ static inline long arch_local_irq_save(void)
         "       flag.nz %0              \n"
         : "=r"(temp), "=r"(flags)
         : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
-        : "cc");
+        : "memory", "cc");
 
         return flags;
 }
@@ -53,7 +53,8 @@ static inline void arch_local_irq_restore(unsigned long flags)
         __asm__ __volatile__(
         "       flag %0                 \n"
         :
-        : "r"(flags));
+        : "r"(flags)
+        : "memory");
 }
 
 /*
@@ -73,7 +74,8 @@ static inline void arch_local_irq_disable(void)
         "       and %0, %0, %1          \n"
         "       flag %0                 \n"
         : "=&r"(temp)
-        : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK)));
+        : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))
+        : "memory");
 }
 
 /*
@@ -85,7 +87,9 @@ static inline long arch_local_save_flags(void)
 
         __asm__ __volatile__(
         "       lr  %0, [status32]      \n"
-        : "=&r"(temp));
+        : "=&r"(temp)
+        :
+        : "memory");
 
         return temp;
 }
diff --git a/arch/c6x/include/asm/irqflags.h b/arch/c6x/include/asm/irqflags.h
index cf78e09e18c3..2c71d5634ec2 100644
--- a/arch/c6x/include/asm/irqflags.h
+++ b/arch/c6x/include/asm/irqflags.h
@@ -27,7 +27,7 @@ static inline unsigned long arch_local_save_flags(void)
 /* set interrupt enabled status */
 static inline void arch_local_irq_restore(unsigned long flags)
 {
-        asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags));
+        asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags) : "memory");
 }
 
 /* unconditionally enable interrupts */
diff --git a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c
index 77597e5ea60a..79521d5499f9 100644
--- a/arch/ia64/kernel/palinfo.c
+++ b/arch/ia64/kernel/palinfo.c
@@ -849,17 +849,6 @@ static palinfo_entry_t palinfo_entries[]={
 
 #define NR_PALINFO_ENTRIES      (int) ARRAY_SIZE(palinfo_entries)
 
-/*
- * this array is used to keep track of the proc entries we create. This is
- * required in the module mode when we need to remove all entries. The procfs code
- * does not do recursion of deletion
- *
- * Notes:
- *      - +1 accounts for the cpuN directory entry in /proc/pal
- */
-#define NR_PALINFO_PROC_ENTRIES (NR_CPUS*(NR_PALINFO_ENTRIES+1))
-
-static struct proc_dir_entry *palinfo_proc_entries[NR_PALINFO_PROC_ENTRIES];
 static struct proc_dir_entry *palinfo_dir;
 
 /*
@@ -971,60 +960,32 @@ palinfo_read_entry(char *page, char **start, off_t off, int count, int *eof, voi
 static void __cpuinit
 create_palinfo_proc_entries(unsigned int cpu)
 {
-#       define CPUSTR   "cpu%d"
-
         pal_func_cpu_u_t f;
-        struct proc_dir_entry **pdir;
         struct proc_dir_entry *cpu_dir;
         int j;
-        char cpustr[sizeof(CPUSTR)];
-
-
-        /*
-         * we keep track of created entries in a depth-first order for
-         * cleanup purposes. Each entry is stored into palinfo_proc_entries
-         */
-        sprintf(cpustr,CPUSTR, cpu);
+        char cpustr[3+4+1];     /* cpu numbers are up to 4095 on itanic */
+        sprintf(cpustr, "cpu%d", cpu);
 
         cpu_dir = proc_mkdir(cpustr, palinfo_dir);
+        if (!cpu_dir)
+                return;
 
         f.req_cpu = cpu;
 
-        /*
-         * Compute the location to store per cpu entries
-         * We dont store the top level entry in this list, but
-         * remove it finally after removing all cpu entries.
-         */
-        pdir = &palinfo_proc_entries[cpu*(NR_PALINFO_ENTRIES+1)];
-        *pdir++ = cpu_dir;
         for (j=0; j < NR_PALINFO_ENTRIES; j++) {
                 f.func_id = j;
-                *pdir = create_proc_read_entry(
-                                palinfo_entries[j].name, 0, cpu_dir,
-                                palinfo_read_entry, (void *)f.value);
-                pdir++;
+                create_proc_read_entry(
+                        palinfo_entries[j].name, 0, cpu_dir,
+                        palinfo_read_entry, (void *)f.value);
         }
 }
 
 static void
 remove_palinfo_proc_entries(unsigned int hcpu)
 {
-        int j;
-        struct proc_dir_entry *cpu_dir, **pdir;
-
-        pdir = &palinfo_proc_entries[hcpu*(NR_PALINFO_ENTRIES+1)];
-        cpu_dir = *pdir;
-        *pdir++=NULL;
-        for (j=0; j < (NR_PALINFO_ENTRIES); j++) {
-                if ((*pdir)) {
-                        remove_proc_entry ((*pdir)->name, cpu_dir);
-                        *pdir ++= NULL;
-                }
-        }
-
-        if (cpu_dir) {
-                remove_proc_entry(cpu_dir->name, palinfo_dir);
-        }
+        char cpustr[3+4+1];     /* cpu numbers are up to 4095 on itanic */
+        sprintf(cpustr, "cpu%d", hcpu);
+        remove_proc_subtree(cpustr, palinfo_dir);
 }
 
 static int __cpuinit palinfo_cpu_callback(struct notifier_block *nfb,
@@ -1058,6 +1019,8 @@ palinfo_init(void)
 
         printk(KERN_INFO "PAL Information Facility v%s\n", PALINFO_VERSION);
         palinfo_dir = proc_mkdir("pal", NULL);
+        if (!palinfo_dir)
+                return -ENOMEM;
 
         /* Create palinfo dirs in /proc for all online cpus */
         for_each_online_cpu(i) {
@@ -1073,22 +1036,8 @@ palinfo_init(void)
 static void __exit
 palinfo_exit(void)
 {
-        int i = 0;
-
-        /* remove all nodes: depth first pass. Could optimize this  */
-        for_each_online_cpu(i) {
-                remove_palinfo_proc_entries(i);
-        }
-
-        /*
-         * Remove the top level entry finally
-         */
-        remove_proc_entry(palinfo_dir->name, NULL);
-
-        /*
-         * Unregister from cpu notifier callbacks
-         */
         unregister_hotcpu_notifier(&palinfo_cpu_notifier);
+        remove_proc_subtree("pal", NULL);
 }
 
 module_init(palinfo_init);
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 0da39fed355a..299731e9036b 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -186,7 +186,13 @@ static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
                                            (0x1UL << 4), &dummy1, &dummy2);
                 if (lpar_rc == H_SUCCESS)
                         return i;
-                BUG_ON(lpar_rc != H_NOT_FOUND);
+
+                /*
+                 * The test for adjunct partition is performed before the
+                 * ANDCOND test.  H_RESOURCE may be returned, so we need to
+                 * check for that as well.
+                 */
+                BUG_ON(lpar_rc != H_NOT_FOUND && lpar_rc != H_RESOURCE);
 
                 slot_offset++;
                 slot_offset &= 0x7;
diff --git a/arch/tile/include/asm/irqflags.h b/arch/tile/include/asm/irqflags.h
index 241c0bb60b12..c96f9bbb760d 100644
--- a/arch/tile/include/asm/irqflags.h
+++ b/arch/tile/include/asm/irqflags.h
@@ -40,7 +40,15 @@
 #include <asm/percpu.h>
 #include <arch/spr_def.h>
 
-/* Set and clear kernel interrupt masks. */
+/*
+ * Set and clear kernel interrupt masks.
+ *
+ * NOTE: __insn_mtspr() is a compiler builtin marked as a memory
+ * clobber.  We rely on it being equivalent to a compiler barrier in
+ * this code since arch_local_irq_save() and friends must act as
+ * compiler barriers.  This compiler semantic is baked into enough
+ * places that the compiler will maintain it going forward.
+ */
 #if CHIP_HAS_SPLIT_INTR_MASK()
 #if INT_PERF_COUNT < 32 || INT_AUX_PERF_COUNT < 32 || INT_MEM_ERROR >= 32
 # error Fix assumptions about which word various interrupts are in
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 6afbb2ca9a0a..a4ea92477e01 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1748,14 +1748,18 @@ static void *m2v(phys_addr_t maddr)
 }
 
 /* Set the page permissions on an identity-mapped pages */
-static void set_page_prot(void *addr, pgprot_t prot)
+static void set_page_prot_flags(void *addr, pgprot_t prot, unsigned long flags)
 {
         unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
         pte_t pte = pfn_pte(pfn, prot);
 
-        if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
+        if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
                 BUG();
 }
+static void set_page_prot(void *addr, pgprot_t prot)
+{
+        return set_page_prot_flags(addr, prot, UVMF_NONE);
+}
 #ifdef CONFIG_X86_32
 static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
 {
@@ -1839,12 +1843,12 @@ static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
                                  unsigned long addr)
 {
         if (*pt_base == PFN_DOWN(__pa(addr))) {
-                set_page_prot((void *)addr, PAGE_KERNEL);
+                set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
                 clear_page((void *)addr);
                 (*pt_base)++;
         }
         if (*pt_end == PFN_DOWN(__pa(addr))) {
-                set_page_prot((void *)addr, PAGE_KERNEL);
+                set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
                 clear_page((void *)addr);
                 (*pt_end)--;
         }