Merge tag 'for-linus-5.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/rw/uml

Pull UML updates from Richard Weinberger:

 - Kconfig cleanups

 - Fix cpu_all_mask() usage

 - Various bug fixes

* tag 'for-linus-5.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: irq: don't set the chip for all irqs
  um: define set_pte_at() as a static inline function, not a macro
  um: remove uses of variable length arrays
  um: remove unused variable
  uml: fix a boot splat wrt use of cpu_all_mask
  um: Do not unlock mutex that is not hold.
  hostfs: fix mismatch between link_file definition and declaration
  arch: um: drivers: Kconfig: pedantic formatting
  arch: um: Kconfig: pedantic indention cleanups
  um: Revert to using stack for pt_regs in signal handling

10 files changed, 253 insertions, 239 deletions

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index ec9711d068b7..6b6eb938fcc1 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -80,46 +80,46 @@ config LD_SCRIPT_DYN
         bool
         default y
         depends on !LD_SCRIPT_STATIC
-        select MODULE_REL_CRCS if MODVERSIONS
+        select MODULE_REL_CRCS if MODVERSIONS
 
 config HOSTFS
         tristate "Host filesystem"
         help
-          While the User-Mode Linux port uses its own root file system for
-          booting and normal file access, this module lets the UML user
-          access files stored on the host.  It does not require any
-          network connection between the Host and UML.  An example use of
-          this might be:
+          While the User-Mode Linux port uses its own root file system for
+          booting and normal file access, this module lets the UML user
+          access files stored on the host.  It does not require any
+          network connection between the Host and UML.  An example use of
+          this might be:
 
-          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
+          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
 
-          where /tmp/fromhost is an empty directory inside UML and
-          /tmp/umlshare is a directory on the host with files the UML user
-          wishes to access.
+          where /tmp/fromhost is an empty directory inside UML and
+          /tmp/umlshare is a directory on the host with files the UML user
+          wishes to access.
 
-          For more information, see
-          <http://user-mode-linux.sourceforge.net/hostfs.html>.
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/hostfs.html>.
 
-          If you'd like to be able to work with files stored on the host,
-          say Y or M here; otherwise say N.
+          If you'd like to be able to work with files stored on the host,
+          say Y or M here; otherwise say N.
 
 config MCONSOLE
         bool "Management console"
         depends on PROC_FS
         default y
         help
-          The user mode linux management console is a low-level interface to
-          the kernel, somewhat like the i386 SysRq interface.  Since there is
-          a full-blown operating system running under every user mode linux
-          instance, there is much greater flexibility possible than with the
-          SysRq mechanism.
+          The user mode linux management console is a low-level interface to
+          the kernel, somewhat like the i386 SysRq interface.  Since there is
+          a full-blown operating system running under every user mode linux
+          instance, there is much greater flexibility possible than with the
+          SysRq mechanism.
 
-          If you answer 'Y' to this option, to use this feature, you need the
-          mconsole client (called uml_mconsole) which is present in CVS in
-          2.4.5-9um and later (path /tools/mconsole), and is also in the
-          distribution RPM package in 2.4.6 and later.
+          If you answer 'Y' to this option, to use this feature, you need the
+          mconsole client (called uml_mconsole) which is present in CVS in
+          2.4.5-9um and later (path /tools/mconsole), and is also in the
+          distribution RPM package in 2.4.6 and later.
 
-          It is safe to say 'Y' here.
+          It is safe to say 'Y' here.
 
 config MAGIC_SYSRQ
         bool "Magic SysRq key"
@@ -142,13 +142,17 @@ config MAGIC_SYSRQ
 
 config KERNEL_STACK_ORDER
         int "Kernel stack size order"
-        default 1 if 64BIT
-        range 1 10 if 64BIT
-        default 0 if !64BIT
+        default 2 if 64BIT
+        range 2 10 if 64BIT
+        default 1 if !64BIT
         help
           This option determines the size of UML kernel stacks.  They will
           be 1 << order pages.  The default is OK unless you're running Valgrind
           on UML, in which case, set this to 3.
+          It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on
+          older (pre-2017) CPUs. It is not recommended on newer CPUs due to the
+          increase in the size of the state which needs to be saved when handling
+          signals.
 
 config MMAPPER
         tristate "iomem emulation driver"
diff --git a/arch/um/drivers/Kconfig b/arch/um/drivers/Kconfig
index 2b1aaf7755aa..2638e46f50cc 100644
--- a/arch/um/drivers/Kconfig
+++ b/arch/um/drivers/Kconfig
@@ -11,58 +11,58 @@ config STDERR_CONSOLE
 config SSL
         bool "Virtual serial line"
         help
-          The User-Mode Linux environment allows you to create virtual serial
-          lines on the UML that are usually made to show up on the host as
-          ttys or ptys.
+          The User-Mode Linux environment allows you to create virtual serial
+          lines on the UML that are usually made to show up on the host as
+          ttys or ptys.
 
-          See <http://user-mode-linux.sourceforge.net/old/input.html> for more
-          information and command line examples of how to use this facility.
+          See <http://user-mode-linux.sourceforge.net/old/input.html> for more
+          information and command line examples of how to use this facility.
 
-          Unless you have a specific reason for disabling this, say Y.
+          Unless you have a specific reason for disabling this, say Y.
 
 config NULL_CHAN
         bool "null channel support"
         help
-          This option enables support for attaching UML consoles and serial
-          lines to a device similar to /dev/null.  Data written to it disappears
-          and there is never any data to be read.
+          This option enables support for attaching UML consoles and serial
+          lines to a device similar to /dev/null.  Data written to it disappears
+          and there is never any data to be read.
 
 config PORT_CHAN
         bool "port channel support"
         help
-          This option enables support for attaching UML consoles and serial
-          lines to host portals.  They may be accessed with 'telnet <host>
-          <port number>'.  Any number of consoles and serial lines may be
-          attached to a single portal, although what UML device you get when
-          you telnet to that portal will be unpredictable.
-          It is safe to say 'Y' here.
+          This option enables support for attaching UML consoles and serial
+          lines to host portals.  They may be accessed with 'telnet <host>
+          <port number>'.  Any number of consoles and serial lines may be
+          attached to a single portal, although what UML device you get when
+          you telnet to that portal will be unpredictable.
+          It is safe to say 'Y' here.
 
 config PTY_CHAN
         bool "pty channel support"
         help
-          This option enables support for attaching UML consoles and serial
-          lines to host pseudo-terminals.  Access to both traditional
-          pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
-          with this option.  The assignment of UML devices to host devices
-          will be announced in the kernel message log.
-          It is safe to say 'Y' here.
+          This option enables support for attaching UML consoles and serial
+          lines to host pseudo-terminals.  Access to both traditional
+          pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
+          with this option.  The assignment of UML devices to host devices
+          will be announced in the kernel message log.
+          It is safe to say 'Y' here.
 
 config TTY_CHAN
         bool "tty channel support"
         help
-          This option enables support for attaching UML consoles and serial
-          lines to host terminals.  Access to both virtual consoles
-          (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
-          /dev/pts/*) are controlled by this option.
-          It is safe to say 'Y' here.
+          This option enables support for attaching UML consoles and serial
+          lines to host terminals.  Access to both virtual consoles
+          (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
+          /dev/pts/*) are controlled by this option.
+          It is safe to say 'Y' here.
 
 config XTERM_CHAN
         bool "xterm channel support"
         help
-          This option enables support for attaching UML consoles and serial
-          lines to xterms.  Each UML device so assigned will be brought up in
-          its own xterm.
-          It is safe to say 'Y' here.
+          This option enables support for attaching UML consoles and serial
+          lines to xterms.  Each UML device so assigned will be brought up in
+          its own xterm.
+          It is safe to say 'Y' here.
 
 config NOCONFIG_CHAN
         bool
@@ -72,43 +72,43 @@ config CON_ZERO_CHAN
         string "Default main console channel initialization"
         default "fd:0,fd:1"
         help
-          This is the string describing the channel to which the main console
-          will be attached by default.  This value can be overridden from the
-          command line.  The default value is "fd:0,fd:1", which attaches the
-          main console to stdin and stdout.
-          It is safe to leave this unchanged.
+          This is the string describing the channel to which the main console
+          will be attached by default.  This value can be overridden from the
+          command line.  The default value is "fd:0,fd:1", which attaches the
+          main console to stdin and stdout.
+          It is safe to leave this unchanged.
 
 config CON_CHAN
         string "Default console channel initialization"
         default "xterm"
         help
-          This is the string describing the channel to which all consoles
-          except the main console will be attached by default.  This value can
-          be overridden from the command line.  The default value is "xterm",
-          which brings them up in xterms.
-          It is safe to leave this unchanged, although you may wish to change
-          this if you expect the UML that you build to be run in environments
-          which don't have X or xterm available.
+          This is the string describing the channel to which all consoles
+          except the main console will be attached by default.  This value can
+          be overridden from the command line.  The default value is "xterm",
+          which brings them up in xterms.
+          It is safe to leave this unchanged, although you may wish to change
+          this if you expect the UML that you build to be run in environments
+          which don't have X or xterm available.
 
 config SSL_CHAN
         string "Default serial line channel initialization"
         default "pty"
         help
-          This is the string describing the channel to which the serial lines
-          will be attached by default.  This value can be overridden from the
-          command line.  The default value is "pty", which attaches them to
-          traditional pseudo-terminals.
-          It is safe to leave this unchanged, although you may wish to change
-          this if you expect the UML that you build to be run in environments
-          which don't have a set of /dev/pty* devices.
+          This is the string describing the channel to which the serial lines
+          will be attached by default.  This value can be overridden from the
+          command line.  The default value is "pty", which attaches them to
+          traditional pseudo-terminals.
+          It is safe to leave this unchanged, although you may wish to change
+          this if you expect the UML that you build to be run in environments
+          which don't have a set of /dev/pty* devices.
 
 config UML_SOUND
         tristate "Sound support"
         help
-          This option enables UML sound support.  If enabled, it will pull in
-          soundcore and the UML hostaudio relay, which acts as a intermediary
-          between the host's dsp and mixer devices and the UML sound system.
-          It is safe to say 'Y' here.
+          This option enables UML sound support.  If enabled, it will pull in
+          soundcore and the UML hostaudio relay, which acts as a intermediary
+          between the host's dsp and mixer devices and the UML sound system.
+          It is safe to say 'Y' here.
 
 config SOUND
         tristate
@@ -131,107 +131,107 @@ menu "UML Network Devices"
 config UML_NET
         bool "Virtual network device"
         help
-        While the User-Mode port cannot directly talk to any physical
-        hardware devices, this choice and the following transport options
-        provide one or more virtual network devices through which the UML
-        kernels can talk to each other, the host, and with the host's help,
-        machines on the outside world.
+          While the User-Mode port cannot directly talk to any physical
+          hardware devices, this choice and the following transport options
+          provide one or more virtual network devices through which the UML
+          kernels can talk to each other, the host, and with the host's help,
+          machines on the outside world.
 
-        For more information, including explanations of the networking and
-        sample configurations, see
-        <http://user-mode-linux.sourceforge.net/old/networking.html>.
+          For more information, including explanations of the networking and
+          sample configurations, see
+          <http://user-mode-linux.sourceforge.net/old/networking.html>.
 
-        If you'd like to be able to enable networking in the User-Mode
-        linux environment, say Y; otherwise say N.  Note that you must
-        enable at least one of the following transport options to actually
-        make use of UML networking.
+          If you'd like to be able to enable networking in the User-Mode
+          linux environment, say Y; otherwise say N.  Note that you must
+          enable at least one of the following transport options to actually
+          make use of UML networking.
 
 config UML_NET_ETHERTAP
         bool "Ethertap transport"
         depends on UML_NET
         help
-        The Ethertap User-Mode Linux network transport allows a single
-        running UML to exchange packets with its host over one of the
-        host's Ethertap devices, such as /dev/tap0.  Additional running
-        UMLs can use additional Ethertap devices, one per running UML.
-        While the UML believes it's on a (multi-device, broadcast) virtual
-        Ethernet network, it's in fact communicating over a point-to-point
-        link with the host.
-
-        To use this, your host kernel must have support for Ethertap
-        devices.  Also, if your host kernel is 2.4.x, it must have
-        CONFIG_NETLINK_DEV configured as Y or M.
-
-        For more information, see
-        <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-        has examples of the UML command line to use to enable Ethertap
-        networking.
-
-        If you'd like to set up an IP network with the host and/or the
-        outside world, say Y to this, the Daemon Transport and/or the
-        Slip Transport.  You'll need at least one of them, but may choose
-        more than one without conflict.  If you don't need UML networking,
-        say N.
+          The Ethertap User-Mode Linux network transport allows a single
+          running UML to exchange packets with its host over one of the
+          host's Ethertap devices, such as /dev/tap0.  Additional running
+          UMLs can use additional Ethertap devices, one per running UML.
+          While the UML believes it's on a (multi-device, broadcast) virtual
+          Ethernet network, it's in fact communicating over a point-to-point
+          link with the host.
+
+          To use this, your host kernel must have support for Ethertap
+          devices.  Also, if your host kernel is 2.4.x, it must have
+          CONFIG_NETLINK_DEV configured as Y or M.
+
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
+          has examples of the UML command line to use to enable Ethertap
+          networking.
+
+          If you'd like to set up an IP network with the host and/or the
+          outside world, say Y to this, the Daemon Transport and/or the
+          Slip Transport.  You'll need at least one of them, but may choose
+          more than one without conflict.  If you don't need UML networking,
+          say N.
 
 config UML_NET_TUNTAP
         bool "TUN/TAP transport"
         depends on UML_NET
         help
-        The UML TUN/TAP network transport allows a UML instance to exchange
-        packets with the host over a TUN/TAP device.  This option will only
-        work with a 2.4 host, unless you've applied the TUN/TAP patch to
-        your 2.2 host kernel.
+          The UML TUN/TAP network transport allows a UML instance to exchange
+          packets with the host over a TUN/TAP device.  This option will only
+          work with a 2.4 host, unless you've applied the TUN/TAP patch to
+          your 2.2 host kernel.
 
-        To use this transport, your host kernel must have support for TUN/TAP
-        devices, either built-in or as a module.
+          To use this transport, your host kernel must have support for TUN/TAP
+          devices, either built-in or as a module.
 
 config UML_NET_SLIP
         bool "SLIP transport"
         depends on UML_NET
         help
-        The slip User-Mode Linux network transport allows a running UML to
-        network with its host over a point-to-point link.  Unlike Ethertap,
-        which can carry any Ethernet frame (and hence even non-IP packets),
-        the slip transport can only carry IP packets.
-
-        To use this, your host must support slip devices.
-
-        For more information, see
-        <http://user-mode-linux.sourceforge.net/old/networking.html>.
-        has examples of the UML command line to use to enable slip
-        networking, and details of a few quirks with it.
-
-        The Ethertap Transport is preferred over slip because of its
-        limitations.  If you prefer slip, however, say Y here.  Otherwise
-        choose the Multicast transport (to network multiple UMLs on
-        multiple hosts), Ethertap (to network with the host and the
-        outside world), and/or the Daemon transport (to network multiple
-        UMLs on a single host).  You may choose more than one without
-        conflict.  If you don't need UML networking, say N.
+          The slip User-Mode Linux network transport allows a running UML to
+          network with its host over a point-to-point link.  Unlike Ethertap,
+          which can carry any Ethernet frame (and hence even non-IP packets),
+          the slip transport can only carry IP packets.
+
+          To use this, your host must support slip devices.
+
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/old/networking.html>.
+          has examples of the UML command line to use to enable slip
+          networking, and details of a few quirks with it.
+
+          The Ethertap Transport is preferred over slip because of its
+          limitations.  If you prefer slip, however, say Y here.  Otherwise
+          choose the Multicast transport (to network multiple UMLs on
+          multiple hosts), Ethertap (to network with the host and the
+          outside world), and/or the Daemon transport (to network multiple
+          UMLs on a single host).  You may choose more than one without
+          conflict.  If you don't need UML networking, say N.
 
 config UML_NET_DAEMON
         bool "Daemon transport"
         depends on UML_NET
         help
-        This User-Mode Linux network transport allows one or more running
-        UMLs on a single host to communicate with each other, but not to
-        the host.
-
-        To use this form of networking, you'll need to run the UML
-        networking daemon on the host.
-
-        For more information, see
-        <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-        has examples of the UML command line to use to enable Daemon
-        networking.
-
-        If you'd like to set up a network with other UMLs on a single host,
-        say Y.  If you need a network between UMLs on multiple physical
-        hosts, choose the Multicast Transport.  To set up a network with
-        the host and/or other IP machines, say Y to the Ethertap or Slip
-        transports.  You'll need at least one of them, but may choose
-        more than one without conflict.  If you don't need UML networking,
-        say N.
+          This User-Mode Linux network transport allows one or more running
+          UMLs on a single host to communicate with each other, but not to
+          the host.
+
+          To use this form of networking, you'll need to run the UML
+          networking daemon on the host.
+
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
+          has examples of the UML command line to use to enable Daemon
+          networking.
+
+          If you'd like to set up a network with other UMLs on a single host,
+          say Y.  If you need a network between UMLs on multiple physical
+          hosts, choose the Multicast Transport.  To set up a network with
+          the host and/or other IP machines, say Y to the Ethertap or Slip
+          transports.  You'll need at least one of them, but may choose
+          more than one without conflict.  If you don't need UML networking,
+          say N.
 
 config UML_NET_VECTOR
         bool "Vector I/O high performance network devices"
@@ -270,26 +270,26 @@ config UML_NET_MCAST
         bool "Multicast transport"
         depends on UML_NET
         help
-        This Multicast User-Mode Linux network transport allows multiple
-        UMLs (even ones running on different host machines!) to talk to
-        each other over a virtual ethernet network.  However, it requires
-        at least one UML with one of the other transports to act as a
-        bridge if any of them need to be able to talk to their hosts or any
-        other IP machines.
-
-        To use this, your host kernel(s) must support IP Multicasting.
-
-        For more information, see
-        <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-        has examples of the UML command line to use to enable Multicast
-        networking, and notes about the security of this approach.
-
-        If you need UMLs on multiple physical hosts to communicate as if
-        they shared an Ethernet network, say Y.  If you need to communicate
-        with other IP machines, make sure you select one of the other
-        transports (possibly in addition to Multicast; they're not
-        exclusive).  If you don't need to network UMLs say N to each of
-        the transports.
+          This Multicast User-Mode Linux network transport allows multiple
+          UMLs (even ones running on different host machines!) to talk to
+          each other over a virtual ethernet network.  However, it requires
+          at least one UML with one of the other transports to act as a
+          bridge if any of them need to be able to talk to their hosts or any
+          other IP machines.
+
+          To use this, your host kernel(s) must support IP Multicasting.
+
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
+          has examples of the UML command line to use to enable Multicast
+          networking, and notes about the security of this approach.
+
+          If you need UMLs on multiple physical hosts to communicate as if
+          they shared an Ethernet network, say Y.  If you need to communicate
+          with other IP machines, make sure you select one of the other
+          transports (possibly in addition to Multicast; they're not
+          exclusive).  If you don't need to network UMLs say N to each of
+          the transports.
 
 config UML_NET_PCAP
         bool "pcap transport"
@@ -300,9 +300,9 @@ config UML_NET_PCAP
         UML act as a network monitor for the host.  You must have libcap
         installed in order to build the pcap transport into UML.
 
-        For more information, see
-        <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-        has examples of the UML command line to use to enable this option.
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
+          has examples of the UML command line to use to enable this option.
 
         If you intend to use UML as a network monitor for the host, say
         Y here.  Otherwise, say N.
@@ -311,27 +311,27 @@ config UML_NET_SLIRP
         bool "SLiRP transport"
         depends on UML_NET
         help
-        The SLiRP User-Mode Linux network transport allows a running UML
-        to network by invoking a program that can handle SLIP encapsulated
-        packets.  This is commonly (but not limited to) the application
-        known as SLiRP, a program that can re-socket IP packets back onto
-        the host on which it is run.  Only IP packets are supported,
-        unlike other network transports that can handle all Ethernet
-        frames.  In general, slirp allows the UML the same IP connectivity
-        to the outside world that the host user is permitted, and unlike
-        other transports, SLiRP works without the need of root level
-        privleges, setuid binaries, or SLIP devices on the host.  This
-        also means not every type of connection is possible, but most
-        situations can be accommodated with carefully crafted slirp
-        commands that can be passed along as part of the network device's
-        setup string.  The effect of this transport on the UML is similar
-        that of a host behind a firewall that masquerades all network
-        connections passing through it (but is less secure).
-
-        To use this you should first have slirp compiled somewhere
-        accessible on the host, and have read its documentation.  If you
-        don't need UML networking, say N.
-
-        Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp"
+          The SLiRP User-Mode Linux network transport allows a running UML
+          to network by invoking a program that can handle SLIP encapsulated
+          packets.  This is commonly (but not limited to) the application
+          known as SLiRP, a program that can re-socket IP packets back onto
+          he host on which it is run.  Only IP packets are supported,
+          unlike other network transports that can handle all Ethernet
+          frames.  In general, slirp allows the UML the same IP connectivity
+          to the outside world that the host user is permitted, and unlike
+          other transports, SLiRP works without the need of root level
+          privleges, setuid binaries, or SLIP devices on the host.  This
+          also means not every type of connection is possible, but most
+          situations can be accommodated with carefully crafted slirp
+          commands that can be passed along as part of the network device's
+          setup string.  The effect of this transport on the UML is similar
+          that of a host behind a firewall that masquerades all network
+          connections passing through it (but is less secure).
+
+          To use this you should first have slirp compiled somewhere
+          accessible on the host, and have read its documentation.  If you
+          don't need UML networking, say N.
+
+          Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp"
 
 endmenu
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index aca09be2373e..33c1cd6a12ac 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -276,14 +276,14 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out)
                 str++;
                 if(!strcmp(str, "sync")){
                         global_openflags = of_sync(global_openflags);
-                        goto out1;
+                        return err;
                 }
 
                 err = -EINVAL;
                 major = simple_strtoul(str, &end, 0);
                 if((*end != '\0') || (end == str)){
                         *error_out = "Didn't parse major number";
-                        goto out1;
+                        return err;
                 }
 
                 mutex_lock(&ubd_lock);
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index 9c04562310b3..b377df76cc28 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -263,7 +263,12 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
         *pteptr = pte_mknewpage(*pteptr);
         if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
 }
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
+                              pte_t *pteptr, pte_t pteval)
+{
+        set_pte(pteptr, pteval);
+}
 
 #define __HAVE_ARCH_PTE_SAME
 static inline int pte_same(pte_t pte_a, pte_t pte_b)
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index f4874b7ec503..598d7b3d9355 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -479,7 +479,7 @@ void __init init_IRQ(void)
         irq_set_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
 
 
-        for (i = 1; i < NR_IRQS; i++)
+        for (i = 1; i < LAST_IRQ; i++)
                 irq_set_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
         /* Initialize EPOLL Loop */
         os_setup_epoll();
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index 7f06fdbc7ee1..bd3cb694322c 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -59,7 +59,6 @@ static pte_t *maybe_map(unsigned long virt, int is_write)
 static int do_op_one_page(unsigned long addr, int len, int is_write,
                  int (*op)(unsigned long addr, int len, void *arg), void *arg)
 {
-        jmp_buf buf;
         struct page *page;
         pte_t *pte;
         int n;
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 052de4c8acb2..0c572a48158e 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -56,7 +56,7 @@ static int itimer_one_shot(struct clock_event_device *evt)
 static struct clock_event_device timer_clockevent = {
         .name                   = "posix-timer",
         .rating                 = 250,
-        .cpumask                = cpu_all_mask,
+        .cpumask                = cpu_possible_mask,
         .features               = CLOCK_EVT_FEAT_PERIODIC |
                                   CLOCK_EVT_FEAT_ONESHOT,
         .set_state_shutdown     = itimer_shutdown,
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index bf0acb8aad8b..75b10235d369 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -31,29 +31,23 @@ void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
 
 static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
 {
-        struct uml_pt_regs *r;
+        struct uml_pt_regs r;
         int save_errno = errno;
 
-        r = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC);
-        if (!r)
-                panic("out of memory");
-
-        r->is_user = 0;
+        r.is_user = 0;
         if (sig == SIGSEGV) {
                 /* For segfaults, we want the data from the sigcontext. */
-                get_regs_from_mc(r, mc);
-                GET_FAULTINFO_FROM_MC(r->faultinfo, mc);
+                get_regs_from_mc(&r, mc);
+                GET_FAULTINFO_FROM_MC(r.faultinfo, mc);
         }
 
         /* enable signals if sig isn't IRQ signal */
         if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGALRM))
                 unblock_signals();
 
-        (*sig_info[sig])(sig, si, r);
+        (*sig_info[sig])(sig, si, &r);
 
         errno = save_errno;
-
-        free(r);
 }
 
 /*
@@ -91,17 +85,11 @@ void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
 
 static void timer_real_alarm_handler(mcontext_t *mc)
 {
-        struct uml_pt_regs *regs;
-
-        regs = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC);
-        if (!regs)
-                panic("out of memory");
+        struct uml_pt_regs regs;
 
         if (mc != NULL)
-                get_regs_from_mc(regs, mc);
-        timer_handler(SIGALRM, NULL, regs);
-
-        free(regs);
+                get_regs_from_mc(&regs, mc);
+        timer_handler(SIGALRM, NULL, &regs);
 }
 
 void timer_alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
index 998fbb445458..e261656fe9d7 100644
--- a/arch/um/os-Linux/umid.c
+++ b/arch/um/os-Linux/umid.c
@@ -135,12 +135,18 @@ out:
  */
 static inline int is_umdir_used(char *dir)
 {
-        char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
-        char pid[sizeof("nnnnn\0")], *end;
+        char pid[sizeof("nnnnn\0")], *end, *file;
         int dead, fd, p, n, err;
+        size_t filelen;
 
-        n = snprintf(file, sizeof(file), "%s/pid", dir);
-        if (n >= sizeof(file)) {
+        err = asprintf(&file, "%s/pid", dir);
+        if (err < 0)
+                return 0;
+
+        filelen = strlen(file);
+
+        n = snprintf(file, filelen, "%s/pid", dir);
+        if (n >= filelen) {
                 printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n");
                 err = -E2BIG;
                 goto out;
@@ -185,6 +191,7 @@ static inline int is_umdir_used(char *dir)
 out_close:
         close(fd);
 out:
+        free(file);
         return 0;
 }
 
@@ -210,18 +217,21 @@ static int umdir_take_if_dead(char *dir)
 
 static void __init create_pid_file(void)
 {
-        char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
-        char pid[sizeof("nnnnn\0")];
+        char pid[sizeof("nnnnn\0")], *file;
         int fd, n;
 
-        if (umid_file_name("pid", file, sizeof(file)))
+        file = malloc(strlen(uml_dir) + UMID_LEN + sizeof("/pid\0"));
+        if (!file)
                 return;
 
+        if (umid_file_name("pid", file, sizeof(file)))
+                goto out;
+
         fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644);
         if (fd < 0) {
                 printk(UM_KERN_ERR "Open of machine pid file \"%s\" failed: "
                        "%s\n", file, strerror(errno));
-                return;
+                goto out;
         }
 
         snprintf(pid, sizeof(pid), "%d\n", getpid());
@@ -231,6 +241,8 @@ static void __init create_pid_file(void)
                        errno);
 
         close(fd);
+out:
+        free(file);
 }
 
 int __init set_umid(char *name)
@@ -385,13 +397,19 @@ __uml_setup("uml_dir=", set_uml_dir,
 
 static void remove_umid_dir(void)
 {
-        char dir[strlen(uml_dir) + UMID_LEN + 1], err;
+        char *dir, err;
+
+        dir = malloc(strlen(uml_dir) + UMID_LEN + 1);
+        if (!dir)
+                return;
 
         sprintf(dir, "%s%s", uml_dir, umid);
         err = remove_files_and_dir(dir);
         if (err)
                 os_warn("%s - remove_files_and_dir failed with err = %d\n",
                         __func__, err);
+
+        free(dir);
 }
 
 __uml_exitcall(remove_umid_dir);
diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h
index 33b8423ef0c9..f4295aa19350 100644
--- a/fs/hostfs/hostfs.h
+++ b/fs/hostfs/hostfs.h
@@ -87,7 +87,7 @@ extern int do_mkdir(const char *file, int mode);
 extern int hostfs_do_rmdir(const char *file);
 extern int do_mknod(const char *file, int mode, unsigned int major,
                     unsigned int minor);
-extern int link_file(const char *from, const char *to);
+extern int link_file(const char *to, const char *from);
 extern int hostfs_do_readlink(char *file, char *buf, int size);
 extern int rename_file(char *from, char *to);
 extern int rename2_file(char *from, char *to, unsigned int flags);