Merge commit 'v2.6.34-rc1' into for-2.6.35

1 files changed, 72 insertions, 50 deletions

diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c
index b99f81c4906..bd8601601af 100644
--- a/arch/sparc/mm/fault_32.c
+++ b/arch/sparc/mm/fault_32.c
@@ -18,6 +18,7 @@
 #include <linux/signal.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
+#include <linux/perf_event.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/kdebug.h>
@@ -34,6 +35,8 @@
 
 extern int prom_node_root;
 
+int show_unhandled_signals = 1;
+
 /* At boot time we determine these two values necessary for setting
  * up the segment maps and page table entries (pte's).
  */
@@ -148,6 +151,45 @@ asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc,
 	return 0;
 }
 
+static inline void
+show_signal_msg(struct pt_regs *regs, int sig, int code,
+		unsigned long address, struct task_struct *tsk)
+{
+	if (!unhandled_signal(tsk, sig))
+		return;
+
+	if (!printk_ratelimit())
+		return;
+
+	printk("%s%s[%d]: segfault at %lx ip %p (rpc %p) sp %p error %x",
+	       task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+	       tsk->comm, task_pid_nr(tsk), address,
+	       (void *)regs->pc, (void *)regs->u_regs[UREG_I7],
+	       (void *)regs->u_regs[UREG_FP], code);
+
+	print_vma_addr(KERN_CONT " in ", regs->pc);
+
+	printk(KERN_CONT "\n");
+}
+
+static void __do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+			       unsigned long addr)
+{
+	siginfo_t info;
+
+	info.si_signo = sig;
+	info.si_code = code;
+	info.si_errno = 0;
+	info.si_addr = (void __user *) addr;
+	info.si_trapno = 0;
+
+	if (unlikely(show_unhandled_signals))
+		show_signal_msg(regs, sig, info.si_code,
+				addr, current);
+
+	force_sig_info (sig, &info, current);
+}
+
 extern unsigned long safe_compute_effective_address(struct pt_regs *,
 						    unsigned int);
 
@@ -167,6 +209,14 @@ static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
 	return safe_compute_effective_address(regs, insn);
 }
 
+static noinline void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+				      int text_fault)
+{
+	unsigned long addr = compute_si_addr(regs, text_fault);
+
+	__do_fault_siginfo(code, sig, regs, addr);
+}
+
 asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 			       unsigned long address)
 {
@@ -175,9 +225,8 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 	struct mm_struct *mm = tsk->mm;
 	unsigned int fixup;
 	unsigned long g2;
-	siginfo_t info;
 	int from_user = !(regs->psr & PSR_PS);
-	int fault;
+	int fault, code;
 
 	if(text_fault)
 		address = regs->pc;
@@ -194,7 +243,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 	if (!ARCH_SUN4C && address >= TASK_SIZE)
 		goto vmalloc_fault;
 
-	info.si_code = SEGV_MAPERR;
+	code = SEGV_MAPERR;
 
 	/*
 	 * If we're in an interrupt or have no user
@@ -203,6 +252,8 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
         if (in_atomic() || !mm)
                 goto no_context;
 
+	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
+
 	down_read(&mm->mmap_sem);
 
 	/*
@@ -226,7 +277,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 	 * we can handle it..
 	 */
 good_area:
-	info.si_code = SEGV_ACCERR;
+	code = SEGV_ACCERR;
 	if(write) {
 		if(!(vma->vm_flags & VM_WRITE))
 			goto bad_area;
@@ -249,10 +300,15 @@ good_area:
 			goto do_sigbus;
 		BUG();
 	}
-	if (fault & VM_FAULT_MAJOR)
+	if (fault & VM_FAULT_MAJOR) {
 		current->maj_flt++;
-	else
+		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
+			      regs, address);
+	} else {
 		current->min_flt++;
+		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
+			      regs, address);
+	}
 	up_read(&mm->mmap_sem);
 	return;
 
@@ -265,18 +321,8 @@ bad_area:
 
 bad_area_nosemaphore:
 	/* User mode accesses just cause a SIGSEGV */
-	if(from_user) {
-#if 0
-		printk("Fault whee %s [%d]: segfaults at %08lx pc=%08lx\n",
-		       tsk->comm, tsk->pid, address, regs->pc);
-#endif
-		info.si_signo = SIGSEGV;
-		info.si_errno = 0;
-		/* info.si_code set above to make clear whether
-		   this was a SEGV_MAPERR or SEGV_ACCERR fault.  */
-		info.si_addr = (void __user *)compute_si_addr(regs, text_fault);
-		info.si_trapno = 0;
-		force_sig_info (SIGSEGV, &info, tsk);
+	if (from_user) {
+		do_fault_siginfo(code, SIGSEGV, regs, text_fault);
 		return;
 	}
 
@@ -327,12 +373,7 @@ out_of_memory:
 
 do_sigbus:
 	up_read(&mm->mmap_sem);
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_ADRERR;
-	info.si_addr = (void __user *) compute_si_addr(regs, text_fault);
-	info.si_trapno = 0;
-	force_sig_info (SIGBUS, &info, tsk);
+	do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, text_fault);
 	if (!from_user)
 		goto no_context;
 
@@ -370,7 +411,7 @@ asmlinkage void do_sun4c_fault(struct pt_regs *regs, int text_fault, int write,
 			       unsigned long address)
 {
 	extern void sun4c_update_mmu_cache(struct vm_area_struct *,
-					   unsigned long,pte_t);
+					   unsigned long,pte_t *);
 	extern pte_t *sun4c_pte_offset_kernel(pmd_t *,unsigned long);
 	struct task_struct *tsk = current;
 	struct mm_struct *mm = tsk->mm;
@@ -447,7 +488,7 @@ asmlinkage void do_sun4c_fault(struct pt_regs *regs, int text_fault, int write,
 		 *       on the CPU and doing a shrink_mmap() on this vma.
 		 */
 		sun4c_update_mmu_cache (find_vma(current->mm, address), address,
-					*ptep);
+					ptep);
 	else
 		do_sparc_fault(regs, text_fault, write, address);
 }
@@ -458,14 +499,10 @@ static void force_user_fault(unsigned long address, int write)
 	struct vm_area_struct *vma;
 	struct task_struct *tsk = current;
 	struct mm_struct *mm = tsk->mm;
-	siginfo_t info;
+	int code;
 
-	info.si_code = SEGV_MAPERR;
+	code = SEGV_MAPERR;
 
-#if 0
-	printk("wf<pid=%d,wr=%d,addr=%08lx>\n",
-	       tsk->pid, write, address);
-#endif
 	down_read(&mm->mmap_sem);
 	vma = find_vma(mm, address);
 	if(!vma)
@@ -477,7 +514,7 @@ static void force_user_fault(unsigned long address, int write)
 	if(expand_stack(vma, address))
 		goto bad_area;
 good_area:
-	info.si_code = SEGV_ACCERR;
+	code = SEGV_ACCERR;
 	if(write) {
 		if(!(vma->vm_flags & VM_WRITE))
 			goto bad_area;
@@ -494,27 +531,12 @@ good_area:
 	return;
 bad_area:
 	up_read(&mm->mmap_sem);
-#if 0
-	printk("Window whee %s [%d]: segfaults at %08lx\n",
-	       tsk->comm, tsk->pid, address);
-#endif
-	info.si_signo = SIGSEGV;
-	info.si_errno = 0;
-	/* info.si_code set above to make clear whether
-	   this was a SEGV_MAPERR or SEGV_ACCERR fault.  */
-	info.si_addr = (void __user *) address;
-	info.si_trapno = 0;
-	force_sig_info (SIGSEGV, &info, tsk);
+	__do_fault_siginfo(code, SIGSEGV, tsk->thread.kregs, address);
 	return;
 
 do_sigbus:
 	up_read(&mm->mmap_sem);
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_ADRERR;
-	info.si_addr = (void __user *) address;
-	info.si_trapno = 0;
-	force_sig_info (SIGBUS, &info, tsk);
+	__do_fault_siginfo(BUS_ADRERR, SIGBUS, tsk->thread.kregs, address);
 }
 
 void window_overflow_fault(void)