[ANNOUNCE] v4.14.15-rt12
From: Sebastian Andrzej Siewior
Date: Thu Jan 25 2018 - 10:17:13 EST
Dear RT folks!
I'm pleased to announce the v4.14.15-rt12 patch set.
Changes since v4.14.15-rt11:
- Drop ping-sysrq. Since it won't reach mainline in its current shape,
lets drop. Suggested by Carsten Emde.
- Tom Zanussi's "tracing: Inter-event (e.g. latency) support" patch
has been updated to v9.
Known issues
- A warning triggered in "rcu_note_context_switch" originated from
SyS_timer_gettime(). The issue was always there, it is now
visible. Reported by Grygorii Strashko and Daniel Wagner.
The delta patch against v4.14.15-rt11 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.14/incr/patch-4.14.15-rt11-rt12.patch.xz
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.14.15-rt12
The RT patch against v4.14.15 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patch-4.14.15-rt12.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patches-4.14.15-rt12.tar.xz
Sebastian
diff --git a/Documentation/admin-guide/sysrq.rst b/Documentation/admin-guide/sysrq.rst
index 934563e4dbb8..7b9035c01a2e 100644
--- a/Documentation/admin-guide/sysrq.rst
+++ b/Documentation/admin-guide/sysrq.rst
@@ -77,18 +77,6 @@ On all
echo t > /proc/sysrq-trigger
-On all
- Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g.::
-
- echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq
-
- Send an ICMP echo request with this pattern plus the particular
- SysRq command key. Example::
-
- ping -c1 -s57 -p0102030468
-
- will trigger the SysRq-H (help) command.
-
What are the 'command' keys?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 93164a31ec51..8fcff2837484 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -79,7 +79,6 @@ struct netns_ipv4 {
int sysctl_icmp_echo_ignore_all;
int sysctl_icmp_echo_ignore_broadcasts;
- int sysctl_icmp_echo_sysrq;
int sysctl_icmp_ignore_bogus_error_responses;
int sysctl_icmp_ratelimit;
int sysctl_icmp_ratemask;
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 8a00d4da91f2..e47b56632367 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1108,7 +1108,7 @@ static int release_all_synth_events(void)
{
struct list_head release_events;
struct synth_event *event, *e;
- int ret = 0, err = 0;
+ int ret = 0;
INIT_LIST_HEAD(&release_events);
@@ -1121,8 +1121,7 @@ static int release_all_synth_events(void)
}
}
- list_for_each_entry_safe(event, e, &synth_event_list, list)
- list_move(&event->list, &release_events);
+ list_splice_init(&event->list, &release_events);
mutex_unlock(&synth_event_mutex);
@@ -1133,9 +1132,6 @@ static int release_all_synth_events(void)
add_or_delete_synth_event(event, !ret);
}
- if (err)
- ret = err;
-
return ret;
}
@@ -1267,7 +1263,7 @@ check_field_for_var_refs(struct hist_trigger_data *hist_data,
struct hist_field *found = NULL;
unsigned int i;
- if (level > 2)
+ if (level > 3)
return found;
if (!hist_field)
@@ -1373,7 +1369,7 @@ static bool field_has_hist_vars(struct hist_field *hist_field,
{
int i;
- if (level > 2)
+ if (level > 3)
return false;
if (!hist_field)
@@ -2040,6 +2036,23 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
return flags_str;
}
+static void expr_field_str(struct hist_field *field, char *expr)
+{
+ if (field->flags & HIST_FIELD_FL_VAR_REF)
+ strcat(expr, "$");
+
+ strcat(expr, hist_field_name(field, 0));
+
+ if (field->flags) {
+ const char *flags_str = get_hist_field_flags(field);
+
+ if (flags_str) {
+ strcat(expr, ".");
+ strcat(expr, flags_str);
+ }
+ }
+}
+
static char *expr_str(struct hist_field *field, unsigned int level)
{
char *expr;
@@ -2051,6 +2064,11 @@ static char *expr_str(struct hist_field *field, unsigned int level)
if (!expr)
return NULL;
+ if (!field->operands[0]) {
+ expr_field_str(field, expr);
+ return expr;
+ }
+
if (field->operator == FIELD_OP_UNARY_MINUS) {
char *subexpr;
@@ -2068,17 +2086,7 @@ static char *expr_str(struct hist_field *field, unsigned int level)
return expr;
}
- if (field->operands[0]->flags & HIST_FIELD_FL_VAR_REF)
- strcat(expr, "$");
- strcat(expr, hist_field_name(field->operands[0], 0));
- if (field->operands[0]->flags) {
- const char *flags_str = get_hist_field_flags(field->operands[0]);
-
- if (flags_str) {
- strcat(expr, ".");
- strcat(expr, flags_str);
- }
- }
+ expr_field_str(field->operands[0], expr);
switch (field->operator) {
case FIELD_OP_MINUS:
@@ -2092,17 +2100,7 @@ static char *expr_str(struct hist_field *field, unsigned int level)
return NULL;
}
- if (field->operands[1]->flags & HIST_FIELD_FL_VAR_REF)
- strcat(expr, "$");
- strcat(expr, hist_field_name(field->operands[1], 0));
- if (field->operands[1]->flags) {
- const char *flags_str = get_hist_field_flags(field->operands[1]);
-
- if (flags_str) {
- strcat(expr, ".");
- strcat(expr, flags_str);
- }
- }
+ expr_field_str(field->operands[1], expr);
return expr;
}
@@ -2138,7 +2136,7 @@ static void destroy_hist_field(struct hist_field *hist_field,
{
unsigned int i;
- if (level > 2)
+ if (level > 3)
return;
if (!hist_field)
@@ -2290,6 +2288,8 @@ static int init_var_ref(struct hist_field *ref_field,
ref_field->var.hist_data = var_field->hist_data;
ref_field->size = var_field->size;
ref_field->is_signed = var_field->is_signed;
+ ref_field->flags |= var_field->flags &
+ (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
if (system) {
ref_field->system = kstrdup(system, GFP_KERNEL);
@@ -2305,10 +2305,18 @@ static int init_var_ref(struct hist_field *ref_field,
}
}
- ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
- if (!ref_field->name) {
- err = -ENOMEM;
- goto free;
+ if (var_field->var.name) {
+ ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
+ if (!ref_field->name) {
+ err = -ENOMEM;
+ goto free;
+ }
+ } else if (var_field->name) {
+ ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
+ if (!ref_field->name) {
+ err = -ENOMEM;
+ goto free;
+ }
}
ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
@@ -2496,9 +2504,9 @@ static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
return alias;
}
-struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
- struct trace_event_file *file, char *str,
- unsigned long *flags, char *var_name)
+static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
+ struct trace_event_file *file, char *str,
+ unsigned long *flags, char *var_name)
{
char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
struct ftrace_event_field *field = NULL;
@@ -2575,7 +2583,8 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
// we support only -(xxx) i.e. explicit parens required
- if (level > 2) {
+ if (level > 3) {
+ hist_err("Too many subexpressions (3 max): ", str);
ret = -EINVAL;
goto free;
}
@@ -2590,7 +2599,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
goto free;
}
- s = strchr(str, ')');
+ s = strrchr(str, ')');
if (s)
*s = '\0';
else {
@@ -2598,12 +2607,6 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
goto free;
}
- strsep(&str, "(");
- if (!str) {
- ret = -EINVAL;
- goto free;
- }
-
flags |= HIST_FIELD_FL_EXPR;
expr = create_hist_field(hist_data, NULL, flags, var_name);
if (!expr) {
@@ -2618,6 +2621,8 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
goto free;
}
+ expr->flags |= operand1->flags &
+ (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
expr->fn = hist_field_unary_minus;
expr->operands[0] = operand1;
expr->operator = FIELD_OP_UNARY_MINUS;
@@ -2679,8 +2684,10 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
int field_op, ret = -EINVAL;
char *sep, *operand1_str;
- if (level > 2)
+ if (level > 3) {
+ hist_err("Too many subexpressions (3 max): ", str);
return ERR_PTR(-EINVAL);
+ }
field_op = contains_operator(str);
@@ -2728,6 +2735,10 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
goto free;
flags |= HIST_FIELD_FL_EXPR;
+
+ flags |= operand1->flags &
+ (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
+
expr = create_hist_field(hist_data, NULL, flags, var_name);
if (!expr) {
ret = -ENOMEM;
diff --git a/localversion-rt b/localversion-rt
index 05c35cb58077..6e44e540b927 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt11
+-rt12
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 574d2a3c86a0..0310ea93f877 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -69,7 +69,6 @@
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
-#include <linux/sysrq.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
@@ -924,30 +923,6 @@ static bool icmp_redirect(struct sk_buff *skb)
return true;
}
-/*
- * 32bit and 64bit have different timestamp length, so we check for
- * the cookie at offset 20 and verify it is repeated at offset 50
- */
-#define CO_POS0 20
-#define CO_POS1 50
-#define CO_SIZE sizeof(int)
-#define ICMP_SYSRQ_SIZE 57
-
-/*
- * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie
- * pattern and if it matches send the next byte as a trigger to sysrq.
- */
-static void icmp_check_sysrq(struct net *net, struct sk_buff *skb)
-{
- int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq);
- char *p = skb->data;
-
- if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) &&
- !memcmp(&cookie, p + CO_POS1, CO_SIZE) &&
- p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE])
- handle_sysrq(p[CO_POS0 + CO_SIZE]);
-}
-
/*
* Handle ICMP_ECHO ("ping") requests.
*
@@ -975,11 +950,6 @@ static bool icmp_echo(struct sk_buff *skb)
icmp_param.data_len = skb->len;
icmp_param.head_len = sizeof(struct icmphdr);
icmp_reply(&icmp_param, skb);
-
- if (skb->len == ICMP_SYSRQ_SIZE &&
- net->ipv4.sysctl_icmp_echo_sysrq) {
- icmp_check_sysrq(net, skb);
- }
}
/* should there be an ICMP stat for ignored echos? */
return true;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 747ba53a8100..0989e739d098 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -771,13 +771,6 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
- {
- .procname = "icmp_echo_sysrq",
- .data = &init_net.ipv4.sysctl_icmp_echo_sysrq,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
{
.procname = "icmp_ignore_bogus_error_responses",
.data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,