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-rw-r--r--arch/i386/kernel/crash.c2
-rw-r--r--arch/i386/kernel/process.c4
-rw-r--r--arch/i386/kernel/setup.c5
-rw-r--r--arch/i386/kernel/time.c2
-rw-r--r--arch/i386/kernel/traps.c61
-rw-r--r--arch/i386/lib/usercopy.c2
6 files changed, 45 insertions, 31 deletions
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c
index 48f0f62f781..5b96f038367 100644
--- a/arch/i386/kernel/crash.c
+++ b/arch/i386/kernel/crash.c
@@ -90,7 +90,7 @@ static void crash_save_self(struct pt_regs *regs)
crash_save_this_cpu(regs, cpu);
}
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
static atomic_t waiting_for_crash_ipi;
static int crash_nmi_callback(struct pt_regs *regs, int cpu)
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 923bb292f47..8657c739656 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -690,8 +690,8 @@ struct task_struct fastcall * __switch_to(struct task_struct *prev_p, struct tas
/*
* Now maybe handle debug registers and/or IO bitmaps
*/
- if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW))
- || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))
+ if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW)
+ || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)))
__switch_to_xtra(next_p, tss);
disable_tsc(prev_p, next_p);
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 7864395c144..f1682206d30 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1327,7 +1327,10 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
res->start = e820.map[i].addr;
res->end = res->start + e820.map[i].size - 1;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- request_resource(&iomem_resource, res);
+ if (request_resource(&iomem_resource, res)) {
+ kfree(res);
+ continue;
+ }
if (e820.map[i].type == E820_RAM) {
/*
* We don't know which RAM region contains kernel data,
diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index 8705c0f0578..edd00f6cee3 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -135,7 +135,7 @@ unsigned long profile_pc(struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
- if (in_lock_functions(pc))
+ if (!user_mode_vm(regs) && in_lock_functions(pc))
return *(unsigned long *)(regs->ebp + 4);
return pc;
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 5cfd4f42eeb..021f8fdc751 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -187,10 +187,21 @@ static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
if (unwind_init_blocked(&info, task) == 0)
unw_ret = show_trace_unwind(&info, log_lvl);
}
- if (unw_ret > 0) {
- if (call_trace > 0)
+ if (unw_ret > 0 && !arch_unw_user_mode(&info)) {
+#ifdef CONFIG_STACK_UNWIND
+ print_symbol("DWARF2 unwinder stuck at %s\n",
+ UNW_PC(&info));
+ if (call_trace == 1) {
+ printk("Leftover inexact backtrace:\n");
+ if (UNW_SP(&info))
+ stack = (void *)UNW_SP(&info);
+ } else if (call_trace > 1)
return;
- printk("%sLegacy call trace:\n", log_lvl);
+ else
+ printk("Full inexact backtrace again:\n");
+#else
+ printk("Inexact backtrace:\n");
+#endif
}
}
@@ -324,35 +335,35 @@ void show_registers(struct pt_regs *regs)
static void handle_BUG(struct pt_regs *regs)
{
+ unsigned long eip = regs->eip;
unsigned short ud2;
- unsigned short line;
- char *file;
- char c;
- unsigned long eip;
-
- eip = regs->eip;
if (eip < PAGE_OFFSET)
- goto no_bug;
+ return;
if (__get_user(ud2, (unsigned short __user *)eip))
- goto no_bug;
+ return;
if (ud2 != 0x0b0f)
- goto no_bug;
- if (__get_user(line, (unsigned short __user *)(eip + 2)))
- goto bug;
- if (__get_user(file, (char * __user *)(eip + 4)) ||
- (unsigned long)file < PAGE_OFFSET || __get_user(c, file))
- file = "<bad filename>";
+ return;
printk(KERN_EMERG "------------[ cut here ]------------\n");
- printk(KERN_EMERG "kernel BUG at %s:%d!\n", file, line);
-no_bug:
- return;
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+ do {
+ unsigned short line;
+ char *file;
+ char c;
+
+ if (__get_user(line, (unsigned short __user *)(eip + 2)))
+ break;
+ if (__get_user(file, (char * __user *)(eip + 4)) ||
+ (unsigned long)file < PAGE_OFFSET || __get_user(c, file))
+ file = "<bad filename>";
- /* Here we know it was a BUG but file-n-line is unavailable */
-bug:
- printk(KERN_EMERG "Kernel BUG\n");
+ printk(KERN_EMERG "kernel BUG at %s:%d!\n", file, line);
+ return;
+ } while (0);
+#endif
+ printk(KERN_EMERG "Kernel BUG at [verbose debug info unavailable]\n");
}
/* This is gone through when something in the kernel
@@ -1238,8 +1249,10 @@ static int __init call_trace_setup(char *s)
call_trace = -1;
else if (strcmp(s, "both") == 0)
call_trace = 0;
- else if (strcmp(s, "new") == 0)
+ else if (strcmp(s, "newfallback") == 0)
call_trace = 1;
+ else if (strcmp(s, "new") == 2)
+ call_trace = 2;
return 1;
}
__setup("call_trace=", call_trace_setup);
diff --git a/arch/i386/lib/usercopy.c b/arch/i386/lib/usercopy.c
index 4b75212ab6d..efc7e7d5f4d 100644
--- a/arch/i386/lib/usercopy.c
+++ b/arch/i386/lib/usercopy.c
@@ -843,7 +843,6 @@ unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *fr
unsigned long
copy_to_user(void __user *to, const void *from, unsigned long n)
{
- might_sleep();
BUG_ON((long) n < 0);
if (access_ok(VERIFY_WRITE, to, n))
n = __copy_to_user(to, from, n);
@@ -870,7 +869,6 @@ EXPORT_SYMBOL(copy_to_user);
unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
- might_sleep();
BUG_ON((long) n < 0);
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-22 01:14:44 +0000