5 files changed, 48 insertions, 44 deletions

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index a6ffc775a9f8..f6448c7c62b5 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -323,7 +323,8 @@ void flush_dcache_page(struct page *page)
                  * specifically accesses it, of course) */
 
                 flush_tlb_page(mpnt, addr);
-                if (old_addr == 0 || (old_addr & (SHMLBA - 1)) != (addr & (SHMLBA - 1))) {
+                if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
+                                      != (addr & (SHM_COLOUR - 1))) {
                         __flush_cache_page(mpnt, addr, page_to_phys(page));
                         if (old_addr)
                                 printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %s\n", old_addr, addr, mpnt->vm_file ? (char *)mpnt->vm_file->f_path.dentry->d_name.name : "(null)");
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index b7cadc4a06cd..e1ffea2f9a0b 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -45,7 +45,7 @@
 
 static int get_offset(unsigned int last_mmap)
 {
-        return (last_mmap & (SHMLBA-1)) >> PAGE_SHIFT;
+        return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT;
 }
 
 static unsigned long shared_align_offset(unsigned int last_mmap,
@@ -57,8 +57,8 @@ static unsigned long shared_align_offset(unsigned int last_mmap,
 static inline unsigned long COLOR_ALIGN(unsigned long addr,
                          unsigned int last_mmap, unsigned long pgoff)
 {
-        unsigned long base = (addr+SHMLBA-1) & ~(SHMLBA-1);
-        unsigned long off  = (SHMLBA-1) &
+        unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
+        unsigned long off  = (SHM_COLOUR-1) &
                 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT);
 
         return base + off;
@@ -72,10 +72,10 @@ static unsigned long mmap_upper_limit(void)
 {
         unsigned long stack_base;
 
-        /* Limit stack size to 1GB - see setup_arg_pages() in fs/exec.c */
+        /* Limit stack size - see setup_arg_pages() in fs/exec.c */
         stack_base = rlimit_max(RLIMIT_STACK);
-        if (stack_base > (1 << 30))
-                stack_base = 1 << 30;
+        if (stack_base > STACK_SIZE_MAX)
+                stack_base = STACK_SIZE_MAX;
 
         return PAGE_ALIGN(STACK_TOP - stack_base);
 }
@@ -101,7 +101,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
         if (flags & MAP_FIXED) {
                 if ((flags & MAP_SHARED) && last_mmap &&
                     (addr - shared_align_offset(last_mmap, pgoff))
-                                & (SHMLBA - 1))
+                                & (SHM_COLOUR - 1))
                         return -EINVAL;
                 goto found_addr;
         }
@@ -122,7 +122,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
         info.length = len;
         info.low_limit = mm->mmap_legacy_base;
         info.high_limit = mmap_upper_limit();
-        info.align_mask = last_mmap ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+        info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
         info.align_offset = shared_align_offset(last_mmap, pgoff);
         addr = vm_unmapped_area(&info);
 
@@ -161,7 +161,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         if (flags & MAP_FIXED) {
                 if ((flags & MAP_SHARED) && last_mmap &&
                     (addr - shared_align_offset(last_mmap, pgoff))
-                        & (SHMLBA - 1))
+                        & (SHM_COLOUR - 1))
                         return -EINVAL;
                 goto found_addr;
         }
@@ -182,7 +182,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         info.length = len;
         info.low_limit = PAGE_SIZE;
         info.high_limit = mm->mmap_base;
-        info.align_mask = last_mmap ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+        info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
         info.align_offset = shared_align_offset(last_mmap, pgoff);
         addr = vm_unmapped_area(&info);
         if (!(addr & ~PAGE_MASK))
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index a63bb179f79a..838786011037 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -589,10 +589,13 @@ cas_nocontend:
 # endif
 /* ENABLE_LWS_DEBUG */
 
+        rsm     PSW_SM_I, %r0                           /* Disable interrupts */
+        /* COW breaks can cause contention on UP systems */
         LDCW    0(%sr2,%r20), %r28                      /* Try to acquire the lock */
         cmpb,<>,n       %r0, %r28, cas_action           /* Did we get it? */
 cas_wouldblock:
         ldo     2(%r0), %r28                            /* 2nd case */
+        ssm     PSW_SM_I, %r0
         b       lws_exit                                /* Contended... */
         ldo     -EAGAIN(%r0), %r21                      /* Spin in userspace */
 
@@ -619,15 +622,17 @@ cas_action:
         stw     %r1, 4(%sr2,%r20)
 #endif
         /* The load and store could fail */
-1:      ldw     0(%sr3,%r26), %r28
+1:      ldw,ma  0(%sr3,%r26), %r28
         sub,<>  %r28, %r25, %r0
-2:      stw     %r24, 0(%sr3,%r26)
+2:      stw,ma  %r24, 0(%sr3,%r26)
         /* Free lock */
-        stw     %r20, 0(%sr2,%r20)
+        stw,ma  %r20, 0(%sr2,%r20)
 #if ENABLE_LWS_DEBUG
         /* Clear thread register indicator */
         stw     %r0, 4(%sr2,%r20)
 #endif
+        /* Enable interrupts */
+        ssm     PSW_SM_I, %r0
         /* Return to userspace, set no error */
         b       lws_exit
         copy    %r0, %r21
@@ -639,6 +644,7 @@ cas_action:
 #if ENABLE_LWS_DEBUG
         stw     %r0, 4(%sr2,%r20)
 #endif
+        ssm     PSW_SM_I, %r0
         b       lws_exit
         ldo     -EFAULT(%r0),%r21       /* set errno */
         nop
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index 80e5dd248934..c5fa7a697fba 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -392,7 +392,7 @@
         ENTRY_COMP(vmsplice)
         ENTRY_COMP(move_pages)          /* 295 */
         ENTRY_SAME(getcpu)
-        ENTRY_SAME(epoll_pwait)
+        ENTRY_COMP(epoll_pwait)
         ENTRY_COMP(statfs64)
         ENTRY_COMP(fstatfs64)
         ENTRY_COMP(kexec_load)          /* 300 */
@@ -432,6 +432,7 @@
         ENTRY_SAME(sched_setattr)
         ENTRY_SAME(sched_getattr)       /* 335 */
         ENTRY_COMP(utimes)
+        ENTRY_SAME(renameat2)
 
         /* Nothing yet */
 
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 1cd1d0c83b6d..47ee620d15d2 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -25,6 +25,7 @@
 #include <linux/interrupt.h>
 #include <linux/console.h>
 #include <linux/bug.h>
+#include <linux/ratelimit.h>
 
 #include <asm/assembly.h>
 #include <asm/uaccess.h>
@@ -42,9 +43,6 @@
 
 #include "../math-emu/math-emu.h"       /* for handle_fpe() */
 
-#define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */
-                          /*  dumped to the console via printk)          */
-
 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 DEFINE_SPINLOCK(pa_dbit_lock);
 #endif
@@ -160,6 +158,17 @@ void show_regs(struct pt_regs *regs)
         }
 }
 
+static DEFINE_RATELIMIT_STATE(_hppa_rs,
+        DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);
+
+#define parisc_printk_ratelimited(critical, regs, fmt, ...)     {             \
+        if ((critical || show_unhandled_signals) && __ratelimit(&_hppa_rs)) { \
+                printk(fmt, ##__VA_ARGS__);                                   \
+                show_regs(regs);                                              \
+        }                                                                     \
+}
+
+
 static void do_show_stack(struct unwind_frame_info *info)
 {
         int i = 1;
@@ -229,12 +238,10 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
                 if (err == 0)
                         return; /* STFU */
 
-                printk(KERN_CRIT "%s (pid %d): %s (code %ld) at " RFMT "\n",
+                parisc_printk_ratelimited(1, regs,
+                        KERN_CRIT "%s (pid %d): %s (code %ld) at " RFMT "\n",
                         current->comm, task_pid_nr(current), str, err, regs->iaoq[0]);
-#ifdef PRINT_USER_FAULTS
-                /* XXX for debugging only */
-                show_regs(regs);
-#endif
+
                 return;
         }
 
@@ -321,14 +328,11 @@ static void handle_break(struct pt_regs *regs)
                         (tt == BUG_TRAP_TYPE_NONE) ? 9 : 0);
         }
 
-#ifdef PRINT_USER_FAULTS
-        if (unlikely(iir != GDB_BREAK_INSN)) {
-                printk(KERN_DEBUG "break %d,%d: pid=%d command='%s'\n",
+        if (unlikely(iir != GDB_BREAK_INSN))
+                parisc_printk_ratelimited(0, regs,
+                        KERN_DEBUG "break %d,%d: pid=%d command='%s'\n",
                         iir & 31, (iir>>13) & ((1<<13)-1),
                         task_pid_nr(current), current->comm);
-                show_regs(regs);
-        }
-#endif
 
         /* send standard GDB signal */
         handle_gdb_break(regs, TRAP_BRKPT);
@@ -758,11 +762,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 
         default:
                 if (user_mode(regs)) {
-#ifdef PRINT_USER_FAULTS
-                        printk(KERN_DEBUG "\nhandle_interruption() pid=%d command='%s'\n",
-                            task_pid_nr(current), current->comm);
-                        show_regs(regs);
-#endif
+                        parisc_printk_ratelimited(0, regs, KERN_DEBUG
+                                "handle_interruption() pid=%d command='%s'\n",
+                                task_pid_nr(current), current->comm);
                         /* SIGBUS, for lack of a better one. */
                         si.si_signo = SIGBUS;
                         si.si_code = BUS_OBJERR;
@@ -779,16 +781,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 
         if (user_mode(regs)) {
             if ((fault_space >> SPACEID_SHIFT) != (regs->sr[7] >> SPACEID_SHIFT)) {
-#ifdef PRINT_USER_FAULTS
-                if (fault_space == 0)
-                        printk(KERN_DEBUG "User Fault on Kernel Space ");
-                else
-                        printk(KERN_DEBUG "User Fault (long pointer) (fault %d) ",
-                               code);
-                printk(KERN_CONT "pid=%d command='%s'\n",
-                       task_pid_nr(current), current->comm);
-                show_regs(regs);
-#endif
+                parisc_printk_ratelimited(0, regs, KERN_DEBUG
+                                "User fault %d on space 0x%08lx, pid=%d command='%s'\n",
+                                code, fault_space,
+                                task_pid_nr(current), current->comm);
                 si.si_signo = SIGSEGV;
                 si.si_errno = 0;
                 si.si_code = SEGV_MAPERR;