Merge tag 'for-linus-5.17-rc1' of git://git.kernel.org/pub/scm/linux/…

…kernel/git/rw/uml

Pull UML updates from Richard Weinberger:

 - set_fs removal

 - Devicetree support

 - Many cleanups from Al

 - Various virtio and build related fixes

* tag 'for-linus-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: (31 commits)
  um: virtio_uml: Allow probing from devicetree
  um: Add devicetree support
  um: Extract load file helper from initrd.c
  um: remove set_fs
  hostfs: Fix writeback of dirty pages
  um: Use swap() to make code cleaner
  um: header debriding - sigio.h
  um: header debriding - os.h
  um: header debriding - net_*.h
  um: header debriding - mem_user.h
  um: header debriding - activate_ipi()
  um: common-offsets.h debriding...
  um, x86: bury crypto_tfm_ctx_offset
  um: unexport handle_page_fault()
  um: remove a dangling extern of syscall_trace()
  um: kill unused cpu()
  uml/i386: missing include in barrier.h
  um: stop polluting the namespace with registers.h contents
  logic_io instance of iounmap() needs volatile on argument
  um: move amd64 variant of mmap(2) to arch/x86/um/syscalls_64.c
  ...

arch/um/.gitignore

@@ -2,3 +2,4 @@
 kernel/config.c
 kernel/config.tmp
 kernel/vmlinux.lds
+kernel/capflags.c

arch/um/Kconfig

@@ -18,10 +18,10 @@ config UML
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DEBUG_BUGVERBOSE
 	select NO_DMA if !UML_DMA_EMULATION
+	select OF_EARLY_FLATTREE if OF
 	select GENERIC_IRQ_SHOW
 	select GENERIC_CPU_DEVICES
 	select HAVE_GCC_PLUGINS
-	select SET_FS
 	select TRACE_IRQFLAGS_SUPPORT
 	select TTY # Needed for line.c
 	select HAVE_ARCH_VMAP_STACK

arch/um/drivers/virt-pci.c

@@ -181,15 +181,15 @@ static unsigned long um_pci_cfgspace_read(void *priv, unsigned int offset,
 	/* buf->data is maximum size - we may only use parts of it */
 	struct um_pci_message_buffer *buf;
 	u8 *data;
-	unsigned long ret = ~0ULL;
+	unsigned long ret = ULONG_MAX;
 
 	if (!dev)
-		return ~0ULL;
+		return ULONG_MAX;
 
 	buf = get_cpu_var(um_pci_msg_bufs);
 	data = buf->data;
 
-	memset(data, 0xff, sizeof(data));
+	memset(buf->data, 0xff, sizeof(buf->data));
 
 	switch (size) {
 	case 1:
@@ -304,7 +304,7 @@ static unsigned long um_pci_bar_read(void *priv, unsigned int offset,
 	/* buf->data is maximum size - we may only use parts of it */
 	struct um_pci_message_buffer *buf;
 	u8 *data;
-	unsigned long ret = ~0ULL;
+	unsigned long ret = ULONG_MAX;
 
 	buf = get_cpu_var(um_pci_msg_bufs);
 	data = buf->data;

arch/um/drivers/virtio_uml.c

@@ -21,6 +21,7 @@
  * Based on Virtio MMIO driver by Pawel Moll, copyright 2011-2014, ARM Ltd.
  */
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/virtio.h>
@@ -49,6 +50,7 @@ struct virtio_uml_platform_data {
 struct virtio_uml_device {
 	struct virtio_device vdev;
 	struct platform_device *pdev;
+	struct virtio_uml_platform_data *pdata;
 
 	spinlock_t sock_lock;
 	int sock, req_fd, irq;
@@ -149,7 +151,7 @@ static int vhost_user_recv(struct virtio_uml_device *vu_dev,
 	if (rc == -ECONNRESET && vu_dev->registered) {
 		struct virtio_uml_platform_data *pdata;
 
-		pdata = vu_dev->pdev->dev.platform_data;
+		pdata = vu_dev->pdata;
 
 		virtio_break_device(&vu_dev->vdev);
 		schedule_work(&pdata->conn_broken_wk);
@@ -1090,6 +1092,8 @@ static void virtio_uml_release_dev(struct device *d)
 			container_of(d, struct virtio_device, dev);
 	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
 
+	time_travel_propagate_time();
+
 	/* might not have been opened due to not negotiating the feature */
 	if (vu_dev->req_fd >= 0) {
 		um_free_irq(vu_dev->irq, vu_dev);
@@ -1113,21 +1117,63 @@ void virtio_uml_set_no_vq_suspend(struct virtio_device *vdev,
 		 no_vq_suspend ? "dis" : "en");
 }
 
+static void vu_of_conn_broken(struct work_struct *wk)
+{
+	/*
+	 * We can't remove the device from the devicetree so the only thing we
+	 * can do is warn.
+	 */
+	WARN_ON(1);
+}
+
 /* Platform device */
 
+static struct virtio_uml_platform_data *
+virtio_uml_create_pdata(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct virtio_uml_platform_data *pdata;
+	int ret;
+
+	if (!np)
+		return ERR_PTR(-EINVAL);
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	INIT_WORK(&pdata->conn_broken_wk, vu_of_conn_broken);
+	pdata->pdev = pdev;
+
+	ret = of_property_read_string(np, "socket-path", &pdata->socket_path);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = of_property_read_u32(np, "virtio-device-id",
+				   &pdata->virtio_device_id);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return pdata;
+}
+
 static int virtio_uml_probe(struct platform_device *pdev)
 {
 	struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
 	struct virtio_uml_device *vu_dev;
 	int rc;
 
-	if (!pdata)
-		return -EINVAL;
+	if (!pdata) {
+		pdata = virtio_uml_create_pdata(pdev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
 
 	vu_dev = kzalloc(sizeof(*vu_dev), GFP_KERNEL);
 	if (!vu_dev)
 		return -ENOMEM;
 
+	vu_dev->pdata = pdata;
 	vu_dev->vdev.dev.parent = &pdev->dev;
 	vu_dev->vdev.dev.release = virtio_uml_release_dev;
 	vu_dev->vdev.config = &virtio_uml_config_ops;
@@ -1136,6 +1182,8 @@ static int virtio_uml_probe(struct platform_device *pdev)
 	vu_dev->pdev = pdev;
 	vu_dev->req_fd = -1;
 
+	time_travel_propagate_time();
+
 	do {
 		rc = os_connect_socket(pdata->socket_path);
 	} while (rc == -EINTR);

arch/um/include/asm/delay.h

@@ -14,7 +14,7 @@ static inline void um_ndelay(unsigned long nsecs)
 	ndelay(nsecs);
 }
 #undef ndelay
-#define ndelay um_ndelay
+#define ndelay(n) um_ndelay(n)
 
 static inline void um_udelay(unsigned long usecs)
 {
@@ -26,5 +26,5 @@ static inline void um_udelay(unsigned long usecs)
 	udelay(usecs);
 }
 #undef udelay
-#define udelay um_udelay
+#define udelay(n) um_udelay(n)
 #endif /* __UM_DELAY_H */

arch/um/include/asm/irqflags.h

@@ -3,7 +3,7 @@
 #define __UM_IRQFLAGS_H
 
 extern int signals_enabled;
-int set_signals(int enable);
+int um_set_signals(int enable);
 void block_signals(void);
 void unblock_signals(void);
 
@@ -16,7 +16,7 @@ static inline unsigned long arch_local_save_flags(void)
 #define arch_local_irq_restore arch_local_irq_restore
 static inline void arch_local_irq_restore(unsigned long flags)
 {
-	set_signals(flags);
+	um_set_signals(flags);
 }
 
 #define arch_local_irq_enable arch_local_irq_enable

arch/um/include/asm/processor-generic.h

@@ -11,7 +11,6 @@ struct pt_regs;
 struct task_struct;
 
 #include <asm/ptrace.h>
-#include <registers.h>
 #include <sysdep/archsetjmp.h>
 
 #include <linux/prefetch.h>
@@ -105,6 +104,7 @@ extern struct cpuinfo_um boot_cpu_data;
 #define current_cpu_data boot_cpu_data
 #define cache_line_size()	(boot_cpu_data.cache_alignment)
 
+extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 extern unsigned long __get_wchan(struct task_struct *p);
 

arch/um/include/asm/thread_info.h

@@ -22,9 +22,6 @@ struct thread_info {
 	__u32			cpu;		/* current CPU */
 	int			preempt_count;  /* 0 => preemptable,
 						   <0 => BUG */
-	mm_segment_t		addr_limit;	/* thread address space:
-					 	   0-0xBFFFFFFF for user
-						   0-0xFFFFFFFF for kernel */
 	struct thread_info	*real_thread;    /* Points to non-IRQ stack */
 	unsigned long aux_fp_regs[FP_SIZE];	/* auxiliary fp_regs to save/restore
 						   them out-of-band */
@@ -36,7 +33,6 @@ struct thread_info {
 	.flags =		0,		\
 	.cpu =		0,			\
 	.preempt_count = INIT_PREEMPT_COUNT,	\
-	.addr_limit =	KERNEL_DS,		\
 	.real_thread = NULL,			\
 }
 

arch/um/include/asm/uaccess.h

@@ -8,6 +8,7 @@
 #define __UM_UACCESS_H
 
 #include <asm/elf.h>
+#include <asm/unaligned.h>
 
 #define __under_task_size(addr, size) \
 	(((unsigned long) (addr) < TASK_SIZE) && \
@@ -39,8 +40,24 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
 {
 	return __addr_range_nowrap(addr, size) &&
 		(__under_task_size(addr, size) ||
-		__access_ok_vsyscall(addr, size) ||
-		uaccess_kernel());
+		 __access_ok_vsyscall(addr, size));
 }
 
+/* no pagefaults for kernel addresses in um */
+#define HAVE_GET_KERNEL_NOFAULT 1
+
+#define __get_kernel_nofault(dst, src, type, err_label)			\
+do {									\
+	*((type *)dst) = get_unaligned((type *)(src));			\
+	if (0) /* make sure the label looks used to the compiler */	\
+		goto err_label;						\
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label)			\
+do {									\
+	put_unaligned(*((type *)src), (type *)(dst));			\
+	if (0) /* make sure the label looks used to the compiler */	\
+		goto err_label;						\
+} while (0)
+
 #endif

arch/um/include/shared/common-offsets.h

@@ -9,32 +9,17 @@ DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
 DEFINE(UM_KERN_PAGE_SHIFT, PAGE_SHIFT);
 DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
 
-DEFINE(UM_ELF_CLASS, ELF_CLASS);
-DEFINE(UM_ELFCLASS32, ELFCLASS32);
-DEFINE(UM_ELFCLASS64, ELFCLASS64);
-
-DEFINE(UM_NR_CPUS, NR_CPUS);
-
 DEFINE(UM_GFP_KERNEL, GFP_KERNEL);
 DEFINE(UM_GFP_ATOMIC, GFP_ATOMIC);
 
-/* For crypto assembler code. */
-DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
-
 DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
 
-DEFINE(UM_HZ, HZ);
-
-DEFINE(UM_USEC_PER_SEC, USEC_PER_SEC);
 DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
 DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
 
 #ifdef CONFIG_PRINTK
 DEFINE(UML_CONFIG_PRINTK, CONFIG_PRINTK);
 #endif
-#ifdef CONFIG_NO_HZ_COMMON
-DEFINE(UML_CONFIG_NO_HZ_COMMON, CONFIG_NO_HZ_COMMON);
-#endif
 #ifdef CONFIG_UML_X86
 DEFINE(UML_CONFIG_UML_X86, CONFIG_UML_X86);
 #endif

arch/um/include/shared/irq_user.h

@@ -20,6 +20,5 @@ void sigio_run_timetravel_handlers(void);
 extern void free_irq_by_fd(int fd);
 extern void deactivate_fd(int fd, int irqnum);
 extern int deactivate_all_fds(void);
-extern int activate_ipi(int fd, int pid);
 
 #endif

arch/um/include/shared/kern_util.h

@@ -53,13 +53,11 @@ extern void do_uml_exitcalls(void);
 extern int __cant_sleep(void);
 extern int get_current_pid(void);
 extern int copy_from_user_proc(void *to, void *from, int size);
-extern int cpu(void);
 extern char *uml_strdup(const char *string);
 
 extern unsigned long to_irq_stack(unsigned long *mask_out);
 extern unsigned long from_irq_stack(int nested);
 
-extern void syscall_trace(struct uml_pt_regs *regs, int entryexit);
 extern int singlestepping(void *t);
 
 extern void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);

arch/um/include/shared/longjmp.h

@@ -18,7 +18,7 @@ extern void longjmp(jmp_buf, int);
 	enable = *(volatile int *)&signals_enabled;	\
 	n = setjmp(*buf);				\
 	if(n != 0)					\
-		set_signals_trace(enable);		\
+		um_set_signals_trace(enable);		\
 	n; })
 
 #endif

arch/um/include/shared/mem_user.h

@@ -46,16 +46,11 @@ extern int iomem_size;
 
 #define ROUND_4M(n) ((((unsigned long) (n)) + (1 << 22)) & ~((1 << 22) - 1))
 
-extern int init_mem_user(void);
-extern void setup_memory(void *entry);
 extern unsigned long find_iomem(char *driver, unsigned long *len_out);
 extern void mem_total_pages(unsigned long physmem, unsigned long iomem,
 		     unsigned long highmem);
-extern unsigned long get_vm(unsigned long len);
 extern void setup_physmem(unsigned long start, unsigned long usable,
 			  unsigned long len, unsigned long long highmem);
-extern void add_iomem(char *name, int fd, unsigned long size);
-extern unsigned long phys_offset(unsigned long phys);
 extern void map_memory(unsigned long virt, unsigned long phys,
 		       unsigned long len, int r, int w, int x);
 

arch/um/include/shared/net_kern.h

@@ -59,8 +59,6 @@ struct transport {
 	const int setup_size;
 };
 
-extern struct net_device *ether_init(int);
-extern unsigned short ether_protocol(struct sk_buff *);
 extern int tap_setup_common(char *str, char *type, char **dev_name,
 			    char **mac_out, char **gate_addr);
 extern void register_transport(struct transport *new);

arch/um/include/shared/net_user.h

@@ -24,7 +24,6 @@ struct net_user_info {
 	int mtu;
 };
 
-extern void ether_user_init(void *data, void *dev);
 extern void iter_addresses(void *d, void (*cb)(unsigned char *,
 					       unsigned char *, void *),
 			   void *arg);