x86: clean up arch/x86/ia32/fpu32.c

White space and coding style clenaup.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/ia32/fpu32.c

-/* 
+/*
  * Copyright 2002 Andi Kleen, SuSE Labs.
  * FXSAVE<->i387 conversion support. Based on code by Gareth Hughes.
  * This is used for ptrace, signals and coredumps in 32bit emulation.
- */ 
+ */
 
 #include <linux/sched.h>
 #include <asm/sigcontext32.h>
@@ -13,96 +13,97 @@
 static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
 {
 	unsigned int tmp; /* to avoid 16 bit prefixes in the code */
- 
+
 	/* Transform each pair of bits into 01 (valid) or 00 (empty) */
-        tmp = ~twd;
-        tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
-        /* and move the valid bits to the lower byte. */
-        tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
-        tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
-        tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
-        return tmp;
+	tmp = ~twd;
+	tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
+	/* and move the valid bits to the lower byte. */
+	tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
+	tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
+	tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
+	return tmp;
 }
 
+#define FPREG_ADDR(f, n)	((void *)&(f)->st_space + (n) * 16);
+#define FP_EXP_TAG_VALID	0
+#define FP_EXP_TAG_ZERO		1
+#define FP_EXP_TAG_SPECIAL	2
+#define FP_EXP_TAG_EMPTY	3
+
 static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
 {
-	struct _fpxreg *st = NULL;
+	struct _fpxreg *st;
 	unsigned long tos = (fxsave->swd >> 11) & 7;
 	unsigned long twd = (unsigned long) fxsave->twd;
 	unsigned long tag;
 	unsigned long ret = 0xffff0000;
 	int i;
 
-#define FPREG_ADDR(f, n)	((void *)&(f)->st_space + (n) * 16);
-
-	for (i = 0 ; i < 8 ; i++) {
+	for (i = 0; i < 8; i++, twd >>= 1) {
 		if (twd & 0x1) {
-			st = FPREG_ADDR( fxsave, (i - tos) & 7 );
+			st = FPREG_ADDR(fxsave, (i - tos) & 7);
 
 			switch (st->exponent & 0x7fff) {
 			case 0x7fff:
-				tag = 2;		/* Special */
+				tag = FP_EXP_TAG_SPECIAL;
 				break;
 			case 0x0000:
-				if ( !st->significand[0] &&
-				     !st->significand[1] &&
-				     !st->significand[2] &&
-				     !st->significand[3] ) {
-					tag = 1;	/* Zero */
-				} else {
-					tag = 2;	/* Special */
-				}
+				if (!st->significand[0] &&
+				    !st->significand[1] &&
+				    !st->significand[2] &&
+				    !st->significand[3])
+					tag = FP_EXP_TAG_ZERO;
+				else
+					tag = FP_EXP_TAG_SPECIAL;
 				break;
 			default:
-				if (st->significand[3] & 0x8000) {
-					tag = 0;	/* Valid */
-				} else {
-					tag = 2;	/* Special */
-				}
+				if (st->significand[3] & 0x8000)
+					tag = FP_EXP_TAG_VALID;
+				else
+					tag = FP_EXP_TAG_SPECIAL;
 				break;
 			}
 		} else {
-			tag = 3;			/* Empty */
+			tag = FP_EXP_TAG_EMPTY;
 		}
-		ret |= (tag << (2 * i));
-		twd = twd >> 1;
+		ret |= tag << (2 * i);
 	}
 	return ret;
 }
 
+#define G(num, val) err |= __get_user(val, num + (u32 __user *)buf)
 
 static inline int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
 					 struct _fpstate_ia32 __user *buf)
 {
 	struct _fpxreg *to;
 	struct _fpreg __user *from;
-	int i;
+	int i, err = 0;
 	u32 v;
-	int err = 0;
 
-#define G(num,val) err |= __get_user(val, num + (u32 __user *)buf)
 	G(0, fxsave->cwd);
 	G(1, fxsave->swd);
 	G(2, fxsave->twd);
 	fxsave->twd = twd_i387_to_fxsr(fxsave->twd);
 	G(3, fxsave->rip);
 	G(4, v);
-	fxsave->fop = v>>16;	/* cs ignored */
+	/* cs ignored */
+	fxsave->fop = v>>16;
 	G(5, fxsave->rdp);
 	/* 6: ds ignored */
-#undef G
-	if (err) 
-		return -1; 
+	if (err)
+		return -1;
 
 	to = (struct _fpxreg *)&fxsave->st_space[0];
 	from = &buf->_st[0];
-	for (i = 0 ; i < 8 ; i++, to++, from++) {
+	for (i = 0; i < 8; i++, to++, from++) {
 		if (__copy_from_user(to, from, sizeof(*from)))
 			return -1;
 	}
 	return 0;
 }
 
+#define P(num, val) err |= __put_user(val, num + (u32 __user *)buf)
 
 static inline int convert_fxsr_to_user(struct _fpstate_ia32 __user *buf,
 				       struct i387_fxsave_struct *fxsave,
@@ -111,60 +112,59 @@ static inline int convert_fxsr_to_user(struct _fpstate_ia32 __user *buf,
 {
 	struct _fpreg __user *to;
 	struct _fpxreg *from;
-	int i;
-	u16 cs,ds; 
-	int err = 0; 
+	int i, err = 0;
+	u16 cs, ds;
 
 	if (tsk == current) {
-		/* should be actually ds/cs at fpu exception time,
-		   but that information is not available in 64bit mode. */
-		asm("movw %%ds,%0 " : "=r" (ds)); 
-		asm("movw %%cs,%0 " : "=r" (cs)); 		
-	} else { /* ptrace. task has stopped. */
+		/*
+		 * should be actually ds/cs at fpu exception time, but
+		 * that information is not available in 64bit mode.
+		 */
+		asm("movw %%ds,%0 " : "=r" (ds));
+		asm("movw %%cs,%0 " : "=r" (cs));
+	} else {
+		 /* ptrace. task has stopped. */
 		ds = tsk->thread.ds;
 		cs = regs->cs;
-	} 
+	}
 
-#define P(num,val) err |= __put_user(val, num + (u32 __user *)buf)
 	P(0, (u32)fxsave->cwd | 0xffff0000);
 	P(1, (u32)fxsave->swd | 0xffff0000);
 	P(2, twd_fxsr_to_i387(fxsave));
 	P(3, (u32)fxsave->rip);
-	P(4,  cs | ((u32)fxsave->fop) << 16); 
+	P(4,  cs | ((u32)fxsave->fop) << 16);
 	P(5, fxsave->rdp);
 	P(6, 0xffff0000 | ds);
-#undef P
 
-	if (err) 
-		return -1; 
+	if (err)
+		return -1;
 
 	to = &buf->_st[0];
 	from = (struct _fpxreg *) &fxsave->st_space[0];
-	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
+	for (i = 0; i < 8; i++, to++, from++) {
 		if (__copy_to_user(to, from, sizeof(*to)))
 			return -1;
 	}
 	return 0;
 }
 
-int restore_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf, int fsave) 
-{ 
+int restore_i387_ia32(struct task_struct *tsk,
+		      struct _fpstate_ia32 __user *buf, int fsave)
+{
 	clear_fpu(tsk);
-	if (!fsave) { 
-		if (__copy_from_user(&tsk->thread.i387.fxsave, 
+	if (!fsave) {
+		if (__copy_from_user(&tsk->thread.i387.fxsave,
 				     &buf->_fxsr_env[0],
 				     sizeof(struct i387_fxsave_struct)))
 			return -1;
 		tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
 		set_stopped_child_used_math(tsk);
-	} 
+	}
 	return convert_fxsr_from_user(&tsk->thread.i387.fxsave, buf);
-}  
+}
 
-int save_i387_ia32(struct task_struct *tsk, 
-		   struct _fpstate_ia32 __user *buf, 
-		   struct pt_regs *regs,
-		   int fsave)
+int save_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf,
+		   struct pt_regs *regs, int fsave)
 {
 	int err = 0;
 
@@ -174,8 +174,8 @@ int save_i387_ia32(struct task_struct *tsk,
 	if (fsave)
 		return 0;
 	err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status);
-	if (fsave) 
-		return err ? -1 : 1; 	
+	if (fsave)
+		return err ? -1 : 1;
 	err |= __put_user(X86_FXSR_MAGIC, &buf->magic);
 	err |= __copy_to_user(&buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
 			      sizeof(struct i387_fxsave_struct));