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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-13 11:16:58 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-13 11:16:58 +0900
commit6c536a17fa049d0fb690c1a947b97dbfd304a916 (patch)
treeed86fed39ac0952b2f21afee04d9d1494e9b904b /kernel
parentba8a3d6c7c1956c6ff54a96e23007beccaa95640 (diff)
parentf2f0945e356daef87cdb01c0302801fb11cf382a (diff)
downloadvexpress-lsk-6c536a17fa049d0fb690c1a947b97dbfd304a916.tar.gz
Merge tag 'for_linus-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb
Pull KGDB/KDB fixes and cleanups from Jason Wessel: "Cleanups - Clean up compile warnings in kgdboc.c and x86/kernel/kgdb.c - Add module event hooks for simplified debugging with gdb Fixes - Fix kdb to stop paging with 'q' on bta and dmesg - Fix for data that scrolls off the vga console due to line wrapping when using the kdb pager New - The debug core registers for kernel module events which allows a kernel aware gdb to automatically load symbols and break on entry to a kernel module - Allow kgdboc=kdb to setup kdb on the vga console" * tag 'for_linus-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb: tty/console: fix warnings in drivers/tty/serial/kgdboc.c kdb,vt_console: Fix missed data due to pager overruns kdb: Fix dmesg/bta scroll to quit with 'q' kgdboc: Accept either kbd or kdb to activate the vga + keyboard kdb shell kgdb,x86: fix warning about unused variable mips,kgdb: fix recursive page fault with CONFIG_KPROBES kgdb: Add module event hooks
Diffstat (limited to 'kernel')
-rw-r--r--kernel/debug/debug_core.c18
-rw-r--r--kernel/debug/kdb/kdb_bt.c2
-rw-r--r--kernel/debug/kdb/kdb_io.c33
-rw-r--r--kernel/debug/kdb/kdb_main.c2
4 files changed, 50 insertions, 5 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 17e073c309e..9a61738cefc 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -696,6 +696,22 @@ out:
return ret;
}
+/*
+ * GDB places a breakpoint at this function to know dynamically
+ * loaded objects. It's not defined static so that only one instance with this
+ * name exists in the kernel.
+ */
+
+static int module_event(struct notifier_block *self, unsigned long val,
+ void *data)
+{
+ return 0;
+}
+
+static struct notifier_block dbg_module_load_nb = {
+ .notifier_call = module_event,
+};
+
int kgdb_nmicallback(int cpu, void *regs)
{
#ifdef CONFIG_SMP
@@ -824,6 +840,7 @@ static void kgdb_register_callbacks(void)
kgdb_arch_init();
if (!dbg_is_early)
kgdb_arch_late();
+ register_module_notifier(&dbg_module_load_nb);
register_reboot_notifier(&dbg_reboot_notifier);
atomic_notifier_chain_register(&panic_notifier_list,
&kgdb_panic_event_nb);
@@ -847,6 +864,7 @@ static void kgdb_unregister_callbacks(void)
if (kgdb_io_module_registered) {
kgdb_io_module_registered = 0;
unregister_reboot_notifier(&dbg_reboot_notifier);
+ unregister_module_notifier(&dbg_module_load_nb);
atomic_notifier_chain_unregister(&panic_notifier_list,
&kgdb_panic_event_nb);
kgdb_arch_exit();
diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c
index 07c9bbb94a0..b03e0e814e4 100644
--- a/kernel/debug/kdb/kdb_bt.c
+++ b/kernel/debug/kdb/kdb_bt.c
@@ -129,6 +129,8 @@ kdb_bt(int argc, const char **argv)
}
/* Now the inactive tasks */
kdb_do_each_thread(g, p) {
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
if (task_curr(p))
continue;
if (kdb_bt1(p, mask, argcount, btaprompt))
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 0a69d2adc4f..14ff4849262 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -552,6 +552,7 @@ int vkdb_printf(const char *fmt, va_list ap)
{
int diag;
int linecount;
+ int colcount;
int logging, saved_loglevel = 0;
int saved_trap_printk;
int got_printf_lock = 0;
@@ -584,6 +585,10 @@ int vkdb_printf(const char *fmt, va_list ap)
if (diag || linecount <= 1)
linecount = 24;
+ diag = kdbgetintenv("COLUMNS", &colcount);
+ if (diag || colcount <= 1)
+ colcount = 80;
+
diag = kdbgetintenv("LOGGING", &logging);
if (diag)
logging = 0;
@@ -690,7 +695,7 @@ kdb_printit:
gdbstub_msg_write(kdb_buffer, retlen);
} else {
if (dbg_io_ops && !dbg_io_ops->is_console) {
- len = strlen(kdb_buffer);
+ len = retlen;
cp = kdb_buffer;
while (len--) {
dbg_io_ops->write_char(*cp);
@@ -709,11 +714,29 @@ kdb_printit:
printk(KERN_INFO "%s", kdb_buffer);
}
- if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
- kdb_nextline++;
+ if (KDB_STATE(PAGER)) {
+ /*
+ * Check printed string to decide how to bump the
+ * kdb_nextline to control when the more prompt should
+ * show up.
+ */
+ int got = 0;
+ len = retlen;
+ while (len--) {
+ if (kdb_buffer[len] == '\n') {
+ kdb_nextline++;
+ got = 0;
+ } else if (kdb_buffer[len] == '\r') {
+ got = 0;
+ } else {
+ got++;
+ }
+ }
+ kdb_nextline += got / (colcount + 1);
+ }
/* check for having reached the LINES number of printed lines */
- if (kdb_nextline == linecount) {
+ if (kdb_nextline >= linecount) {
char buf1[16] = "";
/* Watch out for recursion here. Any routine that calls
@@ -765,7 +788,7 @@ kdb_printit:
kdb_grepping_flag = 0;
kdb_printf("\n");
} else if (buf1[0] == ' ') {
- kdb_printf("\n");
+ kdb_printf("\r");
suspend_grep = 1; /* for this recursion */
} else if (buf1[0] == '\n') {
kdb_nextline = linecount - 1;
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 1261dc7eaeb..4d5f8d5612f 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2101,6 +2101,8 @@ static int kdb_dmesg(int argc, const char **argv)
}
if (!lines--)
break;
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
kdb_printf("%.*s\n", (int)len - 1, buf);
}