microblaze: Adding likely macros

On the base on GCOV analytics is helpful to add likely/unlikely
macros.
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/dma.c

@@ -37,7 +37,7 @@ static inline void __dma_sync_page(unsigned long paddr, unsigned long offset,
 
 static unsigned long get_dma_direct_offset(struct device *dev)
 {
-	if (dev)
+	if (likely(dev))
 		return (unsigned long)dev->archdata.dma_data;
 
 	return PCI_DRAM_OFFSET; /* FIXME Not sure if is correct */

arch/microblaze/kernel/process.c

@@ -75,7 +75,10 @@ __setup("hlt", hlt_setup);
 
 void default_idle(void)
 {
-	if (!hlt_counter) {
+	if (likely(hlt_counter)) {
+		while (!need_resched())
+			cpu_relax();
+	} else {
 		clear_thread_flag(TIF_POLLING_NRFLAG);
 		smp_mb__after_clear_bit();
 		local_irq_disable();
@@ -83,9 +86,7 @@ void default_idle(void)
 			cpu_sleep();
 		local_irq_enable();
 		set_thread_flag(TIF_POLLING_NRFLAG);
-	} else
-		while (!need_resched())
-			cpu_relax();
+	}
 }
 
 void cpu_idle(void)

arch/microblaze/lib/memcpy.c

@@ -53,7 +53,7 @@ void *memcpy(void *v_dst, const void *v_src, __kernel_size_t c)
 	const uint32_t *i_src;
 	uint32_t *i_dst;
 
-	if (c >= 4) {
+	if (likely(c >= 4)) {
 		unsigned  value, buf_hold;
 
 		/* Align the dstination to a word boundry. */

arch/microblaze/lib/memset.c

@@ -33,22 +33,23 @@
 #ifdef __HAVE_ARCH_MEMSET
 void *memset(void *v_src, int c, __kernel_size_t n)
 {
-
 	char *src = v_src;
 #ifdef CONFIG_OPT_LIB_FUNCTION
 	uint32_t *i_src;
-	uint32_t w32;
+	uint32_t w32 = 0;
 #endif
 	/* Truncate c to 8 bits */
 	c = (c & 0xFF);
 
 #ifdef CONFIG_OPT_LIB_FUNCTION
-	/* Make a repeating word out of it */
-	w32 = c;
-	w32 |= w32 << 8;
-	w32 |= w32 << 16;
+	if (unlikely(c)) {
+		/* Make a repeating word out of it */
+		w32 = c;
+		w32 |= w32 << 8;
+		w32 |= w32 << 16;
+	}
 
-	if (n >= 4) {
+	if (likely(n >= 4)) {
 		/* Align the destination to a word boundary */
 		/* This is done in an endian independant manner */
 		switch ((unsigned) src & 3) {

arch/microblaze/mm/fault.c

@@ -106,7 +106,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	regs->esr = error_code;
 
 	/* On a kernel SLB miss we can only check for a valid exception entry */
-	if (kernel_mode(regs) && (address >= TASK_SIZE)) {
+	if (unlikely(kernel_mode(regs) && (address >= TASK_SIZE))) {
 		printk(KERN_WARNING "kernel task_size exceed");
 		_exception(SIGSEGV, regs, code, address);
 	}
@@ -122,7 +122,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	}
 #endif /* CONFIG_KGDB */
 
-	if (in_atomic() || !mm) {
+	if (unlikely(in_atomic() || !mm)) {
 		if (kernel_mode(regs))
 			goto bad_area_nosemaphore;
 
@@ -150,7 +150,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * source.  If this is invalid we can skip the address space check,
 	 * thus avoiding the deadlock.
 	 */
-	if (!down_read_trylock(&mm->mmap_sem)) {
+	if (unlikely(!down_read_trylock(&mm->mmap_sem))) {
 		if (kernel_mode(regs) && !search_exception_tables(regs->pc))
 			goto bad_area_nosemaphore;
 
@@ -158,16 +158,16 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	}
 
 	vma = find_vma(mm, address);
-	if (!vma)
+	if (unlikely(!vma))
 		goto bad_area;
 
 	if (vma->vm_start <= address)
 		goto good_area;
 
-	if (!(vma->vm_flags & VM_GROWSDOWN))
+	if (unlikely(!(vma->vm_flags & VM_GROWSDOWN)))
 		goto bad_area;
 
-	if (!is_write)
+	if (unlikely(!is_write))
 		goto bad_area;
 
 	/*
@@ -179,7 +179,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * before setting the user r1.  Thus we allow the stack to
 	 * expand to 1MB without further checks.
 	 */
-	if (address + 0x100000 < vma->vm_end) {
+	if (unlikely(address + 0x100000 < vma->vm_end)) {
 
 		/* get user regs even if this fault is in kernel mode */
 		struct pt_regs *uregs = current->thread.regs;
@@ -209,15 +209,15 @@ good_area:
 	code = SEGV_ACCERR;
 
 	/* a write */
-	if (is_write) {
-		if (!(vma->vm_flags & VM_WRITE))
+	if (unlikely(is_write)) {
+		if (unlikely(!(vma->vm_flags & VM_WRITE)))
 			goto bad_area;
 	/* a read */
 	} else {
 		/* protection fault */
-		if (error_code & 0x08000000)
+		if (unlikely(error_code & 0x08000000))
 			goto bad_area;
-		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+		if (unlikely(!(vma->vm_flags & (VM_READ | VM_EXEC))))
 			goto bad_area;
 	}
 
@@ -235,7 +235,7 @@ survive:
 			goto do_sigbus;
 		BUG();
 	}
-	if (fault & VM_FAULT_MAJOR)
+	if (unlikely(fault & VM_FAULT_MAJOR))
 		current->maj_flt++;
 	else
 		current->min_flt++;

arch/microblaze/mm/pgtable.c

@@ -154,7 +154,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
 		err = 0;
 		set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
 				__pgprot(flags)));
-		if (mem_init_done)
+		if (unlikely(mem_init_done))
 			flush_HPTE(0, va, pmd_val(*pd));
 			/* flush_HPTE(0, va, pg); */
 	}