Merge commit 'v2.6.30-rc6' into perfcounters/core

Merge reason: this branch was on an -rc4 base, merge it up to -rc6
              to get the latest upstream fixes.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 20 insertions, 9 deletions

diff --git a/drivers/char/random.c b/drivers/char/random.c
index f824ef8a927..b2ced39d76b 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1665,15 +1665,20 @@ EXPORT_SYMBOL(secure_dccp_sequence_number);
  * value is not cryptographically secure but for several uses the cost of
  * depleting entropy is too high
  */
+DEFINE_PER_CPU(__u32 [4], get_random_int_hash);
 unsigned int get_random_int(void)
 {
-	/*
-	 * Use IP's RNG. It suits our purpose perfectly: it re-keys itself
-	 * every second, from the entropy pool (and thus creates a limited
-	 * drain on it), and uses halfMD4Transform within the second. We
-	 * also mix it with jiffies and the PID:
-	 */
-	return secure_ip_id((__force __be32)(current->pid + jiffies));
+	struct keydata *keyptr;
+	__u32 *hash = get_cpu_var(get_random_int_hash);
+	int ret;
+
+	keyptr = get_keyptr();
+	hash[0] += current->pid + jiffies + get_cycles() + (int)(long)&ret;
+
+	ret = half_md4_transform(hash, keyptr->secret);
+	put_cpu_var(get_random_int_hash);
+
+	return ret;
 }
 
 /*
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index aed2b2936ec..39a05b5fa9c 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -408,7 +408,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
 	&sysrq_showlocks_op,		/* d */
 	&sysrq_term_op,			/* e */
 	&sysrq_moom_op,			/* f */
-	/* g: May be registered by ppc for kgdb */
+	/* g: May be registered for the kernel debugger */
 	NULL,				/* g */
 	NULL,				/* h - reserved for help */
 	&sysrq_kill_op,			/* i */
@@ -433,7 +433,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
 	&sysrq_sync_op,			/* s */
 	&sysrq_showstate_op,		/* t */
 	&sysrq_mountro_op,		/* u */
-	/* v: May be registered at init time by SMP VOYAGER */
+	/* v: May be registered for frame buffer console restore */
 	NULL,				/* v */
 	&sysrq_showstate_blocked_op,	/* w */
 	/* x: May be registered on ppc/powerpc for xmon */
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index a2dee0eb6da..e6ce632a393 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -400,6 +400,9 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
 	case KIOCSOUND:
 		if (!perm)
 			goto eperm;
+		/* FIXME: This is an old broken API but we need to keep it
+		   supported and somehow separate the historic advertised
+		   tick rate from any real one */
 		if (arg)
 			arg = CLOCK_TICK_RATE / arg;
 		kd_mksound(arg, 0);
@@ -417,6 +420,9 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
 		 */
 		ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
 		count = ticks ? (arg & 0xffff) : 0;
+		/* FIXME: This is an old broken API but we need to keep it
+		   supported and somehow separate the historic advertised
+		   tick rate from any real one */
 		if (count)
 			count = CLOCK_TICK_RATE / count;
 		kd_mksound(count, ticks);