Merge branch 'linus' into tmp.x86.mpparse.new

7 files changed, 51 insertions, 21 deletions

diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
index 74ca7aabf4e1..30860b89ec58 100644
--- a/arch/um/os-Linux/helper.c
+++ b/arch/um/os-Linux/helper.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <sched.h>
+#include <linux/limits.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include "kern_constants.h"
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 6be028ca1817..172ad8f72e12 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -55,7 +55,7 @@ static int ptrace_dump_regs(int pid)
  * Signals that are OK to receive in the stub - we'll just continue it.
  * SIGWINCH will happen when UML is inside a detached screen.
  */
-#define STUB_SIG_MASK (1 << SIGVTALRM)
+#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
 
 /* Signals that the stub will finish with - anything else is an error */
 #define STUB_DONE_MASK (1 << SIGTRAP)
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index b4b36e0f2e89..183db26d01bf 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -121,8 +121,10 @@ static int stop_ptraced_child(int pid, int exitcode, int mustexit)
 {
         int status, n, ret = 0;
 
-        if (ptrace(PTRACE_CONT, pid, 0, 0) < 0)
-                fatal_perror("stop_ptraced_child : ptrace failed");
+        if (ptrace(PTRACE_CONT, pid, 0, 0) < 0) {
+                perror("stop_ptraced_child : ptrace failed");
+                return -1;
+        }
         CATCH_EINTR(n = waitpid(pid, &status, 0));
         if (!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
                 int exit_with = WEXITSTATUS(status);
@@ -212,7 +214,7 @@ static void __init check_sysemu(void)
         if (n < 0)
                 fatal_perror("check_sysemu : wait failed");
         if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
-                fatal("check_sysemu : expected SIGTRAP, got status = %d",
+                fatal("check_sysemu : expected SIGTRAP, got status = %d\n",
                       status);
 
         if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
@@ -254,9 +256,11 @@ static void __init check_sysemu(void)
 
                 if (WIFSTOPPED(status) &&
                     (WSTOPSIG(status) == (SIGTRAP|0x80))) {
-                        if (!count)
-                                fatal("check_ptrace : SYSEMU_SINGLESTEP "
-                                      "doesn't singlestep");
+                        if (!count) {
+                                non_fatal("check_ptrace : SYSEMU_SINGLESTEP "
+                                          "doesn't singlestep");
+                                goto fail;
+                        }
                         n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
                                    os_getpid());
                         if (n < 0)
@@ -266,9 +270,12 @@ static void __init check_sysemu(void)
                 }
                 else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP))
                         count++;
-                else
-                        fatal("check_ptrace : expected SIGTRAP or "
-                              "(SIGTRAP | 0x80), got status = %d", status);
+                else {
+                        non_fatal("check_ptrace : expected SIGTRAP or "
+                                  "(SIGTRAP | 0x80), got status = %d\n",
+                                  status);
+                        goto fail;
+                }
         }
         if (stop_ptraced_child(pid, 0, 0) < 0)
                 goto fail_stopped;
diff --git a/arch/um/os-Linux/sys-i386/registers.c b/arch/um/os-Linux/sys-i386/registers.c
index b487cbead1bd..229f7a53d8da 100644
--- a/arch/um/os-Linux/sys-i386/registers.c
+++ b/arch/um/os-Linux/sys-i386/registers.c
@@ -6,7 +6,7 @@
 
 #include <errno.h>
 #include <sys/ptrace.h>
-#include <asm/user.h>
+#include <sys/user.h>
 #include "kern_constants.h"
 #include "longjmp.h"
 #include "user.h"
@@ -76,7 +76,7 @@ int put_fp_registers(int pid, unsigned long *regs)
 
 void arch_init_registers(int pid)
 {
-        struct user_fxsr_struct fpx_regs;
+        struct user_fpxregs_struct fpx_regs;
         int err;
 
         err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
diff --git a/arch/um/os-Linux/sys-i386/task_size.c b/arch/um/os-Linux/sys-i386/task_size.c
index ccb49b0aff59..be04c1e183bf 100644
--- a/arch/um/os-Linux/sys-i386/task_size.c
+++ b/arch/um/os-Linux/sys-i386/task_size.c
@@ -63,7 +63,7 @@ static int page_ok(unsigned long page)
         return ok;
 }
 
-unsigned long os_get_task_size(void)
+unsigned long os_get_top_address(void)
 {
         struct sigaction sa, old;
         unsigned long bottom = 0;
@@ -76,9 +76,9 @@ unsigned long os_get_task_size(void)
          * hosts, but shouldn't hurt otherwise.
          */
         unsigned long top = 0xffffd000 >> UM_KERN_PAGE_SHIFT;
-        unsigned long test;
+        unsigned long test, original;
 
-        printf("Locating the top of the address space ... ");
+        printf("Locating the bottom of the address space ... ");
         fflush(stdout);
 
         /*
@@ -89,16 +89,31 @@ unsigned long os_get_task_size(void)
         sigemptyset(&sa.sa_mask);
         sa.sa_flags = SA_NODEFER;
         if (sigaction(SIGSEGV, &sa, &old)) {
-                perror("os_get_task_size");
+                perror("os_get_top_address");
                 exit(1);
         }
 
-        if (!page_ok(bottom)) {
-                fprintf(stderr, "Address 0x%x no good?\n",
-                        bottom << UM_KERN_PAGE_SHIFT);
+        /* Manually scan the address space, bottom-up, until we find
+         * the first valid page (or run out of them).
+         */
+        for (bottom = 0; bottom < top; bottom++) {
+                if (page_ok(bottom))
+                        break;
+        }
+
+        /* If we've got this far, we ran out of pages. */
+        if (bottom == top) {
+                fprintf(stderr, "Unable to determine bottom of address "
+                        "space.\n");
                 exit(1);
         }
 
+        printf("0x%x\n", bottom << UM_KERN_PAGE_SHIFT);
+        printf("Locating the top of the address space ... ");
+        fflush(stdout);
+
+        original = bottom;
+
         /* This could happen with a 4G/4G split */
         if (page_ok(top))
                 goto out;
@@ -114,7 +129,7 @@ unsigned long os_get_task_size(void)
 out:
         /* Restore the old SIGSEGV handling */
         if (sigaction(SIGSEGV, &old, NULL)) {
-                perror("os_get_task_size");
+                perror("os_get_top_address");
                 exit(1);
         }
         top <<= UM_KERN_PAGE_SHIFT;
diff --git a/arch/um/os-Linux/sys-x86_64/task_size.c b/arch/um/os-Linux/sys-x86_64/task_size.c
index fad6f57f8ee3..26a0dd1f349c 100644
--- a/arch/um/os-Linux/sys-x86_64/task_size.c
+++ b/arch/um/os-Linux/sys-x86_64/task_size.c
@@ -1,4 +1,4 @@
-unsigned long os_get_task_size(unsigned long shift)
+unsigned long os_get_top_address(unsigned long shift)
 {
         /* The old value of CONFIG_TOP_ADDR */
         return 0x7fc0000000;
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index bee98f466d66..dec5678fc17f 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -106,6 +106,10 @@ static void deliver_alarm(void)
         unsigned long long this_tick = os_nsecs();
         int one_tick = UM_NSEC_PER_SEC / UM_HZ;
 
+        /* Protection against the host's time going backwards */
+        if ((last_tick != 0) && (this_tick < last_tick))
+                this_tick = last_tick;
+
         if (last_tick == 0)
                 last_tick = this_tick - one_tick;
 
@@ -148,6 +152,9 @@ static int after_sleep_interval(struct timespec *ts)
                 start_usecs = usec;
 
         start_usecs -= skew / UM_NSEC_PER_USEC;
+        if (start_usecs < 0)
+                start_usecs = 0;
+
         tv = ((struct timeval) { .tv_sec  = start_usecs / UM_USEC_PER_SEC,
                                  .tv_usec = start_usecs % UM_USEC_PER_SEC });
         interval = ((struct itimerval) { { 0, usec }, tv });