cpu: change _cpu()->thread calls to current_thread() to fix smp race

kernel-src/fs/file.c

@@ -43,7 +43,7 @@ file_t *fd_allocate() {
 }
 
 static int getfree(int start) {
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	int fd = -1;
 	int sfd;
 	for (sfd = start; sfd < proc->fdcount && proc->fd[sfd].file; ++sfd);
@@ -58,7 +58,7 @@ static int growtable(int newcount) {
 	if (newcount > FDTABLE_LIMIT)
 		return EMFILE;
 
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	__assert(newcount > proc->fdcount);
 	void *newtable = realloc(proc->fd, sizeof(fd_t) * newcount);
 	if (newtable == NULL)
@@ -70,7 +70,7 @@ static int growtable(int newcount) {
 }
 
 file_t *fd_get(int fd) {
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 
 	file_t *file = fd < proc->fdcount ? proc->fd[fd].file : NULL;
@@ -84,7 +84,7 @@ file_t *fd_get(int fd) {
 
 int fd_setflags(int fd, int flags) {
 	int error = 0;
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 
 	if (proc->fd[fd].file)
@@ -98,7 +98,7 @@ int fd_setflags(int fd, int flags) {
 
 int fd_getflags(int fd, int *flags) {
 	int error = 0;
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 
 	if (proc->fd[fd].file)
@@ -119,7 +119,7 @@ int fd_new(int flags, file_t **rfile, int *rfd) {
 	if (file == NULL)
 		return ENOMEM;
 
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 
 	// find first free fd
@@ -148,7 +148,7 @@ int fd_new(int flags, file_t **rfile, int *rfd) {
 }
 
 int fd_close(int fd) {
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 
 	file_t *file = fd < proc->fdcount ? proc->fd[fd].file : NULL;
@@ -171,7 +171,7 @@ int fd_close(int fd) {
 }
 
 int fd_clone(proc_t *targproc) {
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	int error = 0;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 
@@ -197,7 +197,7 @@ int fd_clone(proc_t *targproc) {
 }
 
 int fd_insert(file_t *file, int *fdp) {
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	int err = 0;
 	MUTEX_ACQUIRE(&proc->fdmutex, false);
 	int fd = getfree(0);
@@ -220,7 +220,7 @@ int fd_insert(file_t *file, int *fdp) {
 }
 
 int fd_dup(int oldfd, int newfd, bool exact, int fdflags, int *retfd) {
-	proc_t *proc = _cpu()->thread->proc;
+	proc_t *proc = current_thread()->proc;
 	int err = 0;
 
 	if (newfd < 0 || newfd >= FDTABLE_LIMIT)

kernel-src/fs/pipefs.c

@@ -183,8 +183,8 @@ int pipefs_read(vnode_t *node, void *buffer, size_t size, uintmax_t offset, int
 
 static int writetopipe(pipenode_t *pipenode, void *buffer, size_t size, size_t *writec) {
 	if (pipenode->readers == 0) {
-		if (_cpu()->thread->proc)
-			signal_signalproc(_cpu()->thread->proc, SIGPIPE);
+		if (current_thread()->proc)
+			signal_signalproc(current_thread()->proc, SIGPIPE);
 
 		return EPIPE;
 	}

kernel-src/fs/vfs.c

@@ -22,10 +22,10 @@ static spinlock_t listlock;
 static vfs_t *vfslist;
 
 static cred_t *getcred() {
-	if (_cpu()->thread == NULL || _cpu()->thread->proc == NULL)
+	if (current_thread() == NULL || current_thread()->proc == NULL)
 		return NULL;
 	else
-		return &_cpu()->thread->proc->cred;
+		return &current_thread()->proc->cred;
 }
 
 int vfs_pollstub(vnode_t *node, struct polldata *, int events) {
@@ -251,7 +251,7 @@ int vfs_write(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t
 
 		if (node->type == V_TYPE_REGULAR && newsize) {
 			// do resize stuff if regular and applicable
-			err = VOP_RESIZE(node, newsize, &_cpu()->thread->proc->cred);
+			err = VOP_RESIZE(node, newsize, &current_thread()->proc->cred);
 			if (err)
 				goto leave;
 		} else if (node->type == V_TYPE_BLKDEV) {
@@ -780,11 +780,11 @@ int vfs_lookup(vnode_t **result, vnode_t *start, char *path, char *lastcomp, int
 			// get the start node of the dereference
 			vnode_t *derefstart = current;
 
-			if (*linkderef == '/' && _cpu()->thread && _cpu()->thread->proc) {
-				MUTEX_ACQUIRE(&_cpu()->thread->proc->mutex, false);
-				derefstart = _cpu()->thread->proc->root;
+			if (*linkderef == '/' && current_thread() && current_thread()->proc) {
+				MUTEX_ACQUIRE(&current_thread()->proc->mutex, false);
+				derefstart = current_thread()->proc->root;
 				VOP_HOLD(derefstart);
-				MUTEX_RELEASE(&_cpu()->thread->proc->mutex);
+				MUTEX_RELEASE(&current_thread()->proc->mutex);
 			} else if (*linkderef == '/') {
 				derefstart = vfsroot;
 				VOP_HOLD(derefstart);