[PATCH] rename shmat to make it clear it isn't a system call entrypoint

This renames sys_shmat to do_shmat.  Additionally, I've replaced the
cond_syscall with a conditional inline function.

It touches all archs - only i386 is tested.

arch/alpha/kernel/osf_sys.c

@@ -464,7 +464,7 @@ osf_shmat(int shmid, void *shmaddr, int shmflg)
 	unsigned long raddr;
 	long err;
 
-	err = sys_shmat(shmid, shmaddr, shmflg, &raddr);
+	err = do_shmat(shmid, shmaddr, shmflg, &raddr);
 
 	/*
 	 * This works because all user-level addresses are

arch/arm/kernel/sys_arm.c

@@ -210,7 +210,7 @@ asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr,
 		switch (version) {
 		default: {
 			ulong raddr;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			ret = do_shmat (first, (char *) ptr, second, &raddr);
 			if (ret)
 				return ret;
 			return put_user (raddr, (ulong *) third);
@@ -218,7 +218,7 @@ asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr,
 		case 1:	/* iBCS2 emulator entry point */
 			if (!segment_eq(get_fs(), get_ds()))
 				return -EINVAL;
-			return sys_shmat (first, (char *) ptr,
+			return do_shmat (first, (char *) ptr,
 					  second, (ulong *) third);
 		}
 	case SHMDT: 

arch/arm26/kernel/sys_arm.c

@@ -211,7 +211,7 @@ asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr,
 		switch (version) {
 		default: {
 			ulong raddr;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			ret = do_shmat (first, (char *) ptr, second, &raddr);
 			if (ret)
 				return ret;
 			return put_user (raddr, (ulong *) third);
@@ -219,7 +219,7 @@ asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr,
 		case 1:	/* iBCS2 emulator entry point */
 			if (!segment_eq(get_fs(), get_ds()))
 				return -EINVAL;
-			return sys_shmat (first, (char *) ptr,
+			return do_shmat (first, (char *) ptr,
 					  second, (ulong *) third);
 		}
 	case SHMDT: 

arch/cris/kernel/sys_cris.c

@@ -155,7 +155,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 
 	case SHMAT: {
                 ulong raddr;
-                ret = sys_shmat (first, (char __user *) ptr, second, &raddr);
+                ret = do_shmat (first, (char __user *) ptr, second, &raddr);
                 if (ret)
                         return ret;
                 return put_user (raddr, (ulong __user *) third);

arch/h8300/kernel/sys_h8300.c

@@ -240,7 +240,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 			switch (version) {
 			default: {
 				ulong raddr;
-				ret = sys_shmat (first, (char *) ptr,
+				ret = do_shmat (first, (char *) ptr,
 						 second, &raddr);
 				if (ret)
 					return ret;

arch/i386/kernel/sys_i386.c

@@ -186,7 +186,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 		switch (version) {
 		default: {
 			ulong raddr;
-			ret = sys_shmat (first, (char __user *) ptr, second, &raddr);
+			ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 			if (ret)
 				return ret;
 			return put_user (raddr, (ulong __user *) third);
@@ -195,7 +195,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 			if (!segment_eq(get_fs(), get_ds()))
 				return -EINVAL;
 			/* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
-			return sys_shmat (first, (char __user *) ptr, second, (ulong *) third);
+			return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
 		}
 	case SHMDT: 
 		return sys_shmdt ((char __user *)ptr);

arch/ia64/ia32/sys_ia32.c

@@ -1447,7 +1447,7 @@ shmat32 (int first, int second, int third, int version, void *uptr)
 
 	if (version == 1)
 		return -EINVAL;	/* iBCS2 emulator entry point: unsupported */
-	err = sys_shmat(first, uptr, second, &raddr);
+	err = do_shmat(first, uptr, second, &raddr);
 	if (err)
 		return err;
 	return put_user(raddr, uaddr);

arch/ia64/kernel/sys_ia64.c

@@ -98,7 +98,7 @@ ia64_shmat (int shmid, void *shmaddr, int shmflg)
 	unsigned long raddr;
 	int retval;
 
-	retval = sys_shmat(shmid, shmaddr, shmflg, &raddr);
+	retval = do_shmat(shmid, shmaddr, shmflg, &raddr);
 	if (retval < 0)
 		return retval;
 

arch/m68k/kernel/sys_m68k.c

@@ -241,7 +241,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 			switch (version) {
 			default: {
 				ulong raddr;
-				ret = sys_shmat (first, (char *) ptr,
+				ret = do_shmat (first, (char *) ptr,
 						 second, &raddr);
 				if (ret)
 					return ret;

arch/mips/kernel/linux32.c

@@ -1460,7 +1460,7 @@ do_sys32_shmat (int first, int second, int third, int version, void *uptr)
 
 	if (version == 1)
 		return err;
-	err = sys_shmat (first, uptr, second, &raddr);
+	err = do_shmat (first, uptr, second, &raddr);
 	if (err)
 		return err;
 	err = put_user (raddr, uaddr);

arch/mips/kernel/syscall.c

@@ -342,7 +342,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 		switch (version) {
 		default: {
 			ulong raddr;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			ret = do_shmat (first, (char *) ptr, second, &raddr);
 			if (ret)
 				return ret;
 			return put_user (raddr, (ulong *) third);
@@ -350,7 +350,7 @@ asmlinkage int sys_ipc (uint call, int first, int second,
 		case 1:	/* iBCS2 emulator entry point */
 			if (!segment_eq(get_fs(), get_ds()))
 				return -EINVAL;
-			return sys_shmat (first, (char *) ptr, second, (ulong *) third);
+			return do_shmat (first, (char *) ptr, second, (ulong *) third);
 		}
 	case SHMDT:
 		return sys_shmdt ((char *)ptr);

arch/mips/kernel/sysirix.c

@@ -968,7 +968,7 @@ asmlinkage int irix_shmsys(int opcode, unsigned long arg0, unsigned long arg1,
 {
 	switch (opcode) {
 	case 0:
-		return sys_shmat((int) arg0, (char *)arg1, (int) arg2,
+		return do_shmat((int) arg0, (char *)arg1, (int) arg2,
 				 (unsigned long *) arg3);
 	case 1:
 		return sys_shmctl((int)arg0, (int)arg1, (struct shmid_ds *)arg2);

arch/parisc/kernel/sys_parisc.c

@@ -173,7 +173,7 @@ long sys_shmat_wrapper(int shmid, char *shmaddr, int shmflag)
 	unsigned long raddr;
 	int r;
 
-	r = sys_shmat(shmid, shmaddr, shmflag, &raddr);
+	r = do_shmat(shmid, shmaddr, shmflag, &raddr);
 	if (r < 0)
 		return r;
 	return raddr;

arch/ppc/kernel/syscalls.c

@@ -119,7 +119,7 @@ sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fif
 		if ((ret = verify_area(VERIFY_WRITE, (ulong __user *) third,
 				       sizeof(ulong))))
 			break;
-		ret = sys_shmat (first, (char __user *) ptr, second, &raddr);
+		ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 		if (ret)
 			break;
 		ret = put_user (raddr, (ulong __user *) third);

arch/ppc64/kernel/sys_ppc32.c

@@ -1649,7 +1649,7 @@ do_sys32_shmat(int first, int second, int third, int version, void *uptr)
 
 	if (version == 1)
 		return err;
-	err = sys_shmat(first, uptr, second, &raddr);
+	err = do_shmat(first, uptr, second, &raddr);
 	if (err)
 		return err;
 	err = put_user(raddr, uaddr);

arch/ppc64/kernel/syscalls.c

@@ -122,7 +122,7 @@ sys_ipc (uint call, int first, int second, long third, void *ptr, long fifth)
 		switch (version) {
 		default: {
 			ulong raddr;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			ret = do_shmat (first, (char *) ptr, second, &raddr);
 			if (ret)
 				break;
 			ret = put_user (raddr, (ulong *) third);
@@ -132,7 +132,7 @@ sys_ipc (uint call, int first, int second, long third, void *ptr, long fifth)
 			ret = -EINVAL;
 			if (!segment_eq(get_fs(), get_ds()))
 				break;
-			ret = sys_shmat (first, (char *) ptr, second,
+			ret = do_shmat (first, (char *) ptr, second,
 					 (ulong *) third);
 			break;
 		}

arch/s390/kernel/compat_linux.c

@@ -721,7 +721,7 @@ static int do_sys32_shmat (int first, int second, int third, int version, void *
 
 	if (version == 1)
 		goto out;
-	err = sys_shmat (first, uptr, second, &raddr);
+	err = do_shmat (first, uptr, second, &raddr);
 	if (err)
 		goto out;
 	err = put_user (raddr, uaddr);

arch/s390/kernel/sys_s390.c

@@ -225,7 +225,7 @@ asmlinkage __SYS_RETTYPE sys_ipc (uint call, int first, int second,
                 
 	case SHMAT: {
 		ulong raddr;
-		ret = sys_shmat (first, (char *) ptr, second, &raddr);
+		ret = do_shmat (first, (char *) ptr, second, &raddr);
 		if (ret)
 			return ret;
 		return put_user (raddr, (ulong *) third);

arch/sh/kernel/sys_sh.c

@@ -200,7 +200,7 @@ asmlinkage int sys_ipc(uint call, int first, int second,
 			switch (version) {
 			default: {
 				ulong raddr;
-				ret = sys_shmat (first, (char __user *) ptr,
+				ret = do_shmat (first, (char __user *) ptr,
 						 second, &raddr);
 				if (ret)
 					return ret;
@@ -209,7 +209,7 @@ asmlinkage int sys_ipc(uint call, int first, int second,
 			case 1:	/* iBCS2 emulator entry point */
 				if (!segment_eq(get_fs(), get_ds()))
 					return -EINVAL;
-				return sys_shmat (first, (char __user *) ptr,
+				return do_shmat (first, (char __user *) ptr,
 						  second, (ulong *) third);
 			}
 		case SHMDT: 

arch/sparc/kernel/sys_sparc.c

@@ -185,7 +185,7 @@ asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user
 			switch (version) {
 			case 0: default: {
 				ulong raddr;
-				err = sys_shmat (first, (char __user *) ptr, second, &raddr);
+				err = do_shmat (first, (char __user *) ptr, second, &raddr);
 				if (err)
 					goto out;
 				err = -EFAULT;
@@ -195,7 +195,7 @@ asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user
 				goto out;
 				}
 			case 1:	/* iBCS2 emulator entry point */
-				err = sys_shmat (first, (char __user *) ptr, second, (ulong __user *) third);
+				err = do_shmat (first, (char __user *) ptr, second, (ulong __user *) third);
 				goto out;
 			}
 		case SHMDT: 

arch/sparc/kernel/sys_sunos.c

@@ -1006,8 +1006,8 @@ asmlinkage int sunos_shmsys(int op, unsigned long arg1, unsigned long arg2,
 
 	switch(op) {
 	case 0:
-		/* sys_shmat(): attach a shared memory area */
-		rval = sys_shmat((int)arg1,(char *)arg2,(int)arg3,&raddr);
+		/* do_shmat(): attach a shared memory area */
+		rval = do_shmat((int)arg1,(char *)arg2,(int)arg3,&raddr);
 		if(!rval)
 			rval = (int) raddr;
 		break;

arch/sparc64/kernel/sys_sparc.c

@@ -254,7 +254,7 @@ asmlinkage int sys_ipc (unsigned call, int first, int second, unsigned long thir
 		switch (call) {
 		case SHMAT: {
 			ulong raddr;
-			err = sys_shmat (first, (char *) ptr, second, &raddr);
+			err = do_shmat (first, (char *) ptr, second, &raddr);
 			if (!err) {
 				if (put_user(raddr, (ulong __user *) third))
 					err = -EFAULT;

arch/sparc64/kernel/sys_sparc32.c

@@ -642,7 +642,7 @@ static int do_sys32_shmat (int first, int second, int third, int version, void *
 
 	if (version == 1)
 		goto out;
-	err = sys_shmat (first, uptr, second, &raddr);
+	err = do_shmat (first, uptr, second, &raddr);
 	if (err)
 		goto out;
 	err = put_user (raddr, uaddr);

arch/sparc64/kernel/sys_sunos32.c

@@ -1139,8 +1139,8 @@ asmlinkage int sunos_shmsys(int op, u32 arg1, u32 arg2, u32 arg3)
 
 	switch(op) {
 	case 0:
-		/* sys_shmat(): attach a shared memory area */
-		rval = sys_shmat((int)arg1,(char *)A(arg2),(int)arg3,&raddr);
+		/* do_shmat(): attach a shared memory area */
+		rval = do_shmat((int)arg1,(char *)A(arg2),(int)arg3,&raddr);
 		if(!rval)
 			rval = (int) raddr;
 		break;

arch/um/kernel/syscall_kern.c

@@ -235,7 +235,7 @@ int sys_ipc (uint call, int first, int second,
 		switch (version) {
 		default: {
 			ulong raddr;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			ret = do_shmat (first, (char *) ptr, second, &raddr);
 			if (ret)
 				return ret;
 			return put_user (raddr, (ulong *) third);
@@ -243,7 +243,7 @@ int sys_ipc (uint call, int first, int second,
 		case 1:	/* iBCS2 emulator entry point */
 			if (!segment_eq(get_fs(), get_ds()))
 				return -EINVAL;
-			return sys_shmat (first, (char *) ptr, second, (ulong *) third);
+			return do_shmat (first, (char *) ptr, second, (ulong *) third);
 		}
 	case SHMDT: 
 		return sys_shmdt ((char *)ptr);

arch/v850/kernel/syscalls.c

@@ -106,7 +106,7 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 			if ((ret = verify_area(VERIFY_WRITE, (ulong*) third,
 					       sizeof(ulong))))
 				break;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+			ret = do_shmat (first, (char *) ptr, second, &raddr);
 			if (ret)
 				break;
 			ret = put_user (raddr, (ulong *) third);
@@ -115,7 +115,7 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 		case 1:	/* iBCS2 emulator entry point */
 			if (!segment_eq(get_fs(), get_ds()))
 				break;
-			ret = sys_shmat (first, (char *) ptr, second,
+			ret = do_shmat (first, (char *) ptr, second,
 					 (ulong *) third);
 			break;
 		}

arch/x86_64/ia32/ipc32.c

@@ -457,7 +457,7 @@ shmat32 (int first, int second, int third, int version, void *uptr)
 
 	if (version == 1)
 		return -EINVAL;	/* iBCS2 emulator entry point: unsupported */
-	err = sys_shmat(first, uptr, second, &raddr);
+	err = do_shmat(first, uptr, second, &raddr);
 	if (err)
 		return err;
 	return put_user(raddr, uaddr);

arch/x86_64/kernel/sys_x86_64.c

@@ -155,7 +155,7 @@ asmlinkage long sys_uname(struct new_utsname * name)
 asmlinkage long wrap_sys_shmat(int shmid, char *shmaddr, int shmflg)
 {
 	unsigned long raddr;
-	return sys_shmat(shmid,shmaddr,shmflg,&raddr) ?: (long)raddr;
+	return do_shmat(shmid,shmaddr,shmflg,&raddr) ?: (long)raddr;
 }
 
 asmlinkage long sys_time64(long * tloc)

include/linux/shm.h

@@ -90,7 +90,14 @@ struct shmid_kernel /* private to the kernel */
 #define SHM_LOCKED      02000   /* segment will not be swapped */
 #define SHM_HUGETLB     04000   /* segment will use huge TLB pages */
 
-long sys_shmat (int shmid, char __user *shmaddr, int shmflg, unsigned long *addr);
+#ifdef CONFIG_SYSVIPC
+long do_shmat (int shmid, char __user *shmaddr, int shmflg, unsigned long *addr);
+#else
+inline long do_shmat (int shmid, char __user *shmaddr, int shmflg, unsigned long *addr)
+{
+	return -ENOSYS;
+}
+#endif
 asmlinkage long sys_shmget (key_t key, size_t size, int flag);
 asmlinkage long sys_shmdt (char __user *shmaddr);
 asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf);

ipc/shm.c

@@ -635,7 +635,7 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
  * "raddr" thing points to kernel space, and there has to be a wrapper around
  * this.
  */
-asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
+long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
 {
 	struct shmid_kernel *shp;
 	unsigned long addr;

kernel/sys.c

@@ -258,7 +258,6 @@ cond_syscall(sys_msgsnd)
 cond_syscall(sys_msgrcv)
 cond_syscall(sys_msgctl)
 cond_syscall(sys_shmget)
-cond_syscall(sys_shmat)
 cond_syscall(sys_shmdt)
 cond_syscall(sys_shmctl)