Commit a7542923 authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'printk-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Herbert Xu made printk header file self-contained.

 - Andy Shevchenko and Sergey Senozhatsky cleaned up console->setup()
   error handling.

 - Andy Shevchenko did some cleanups (e.g. sparse warning) in vsprintf
   code.

 - Minor documentation updates.

* tag 'printk-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  lib/vsprintf: Force type of flags value for gfp_t
  lib/vsprintf: Replace custom spec to print decimals with generic one
  lib/vsprintf: Replace hidden BUILD_BUG_ON() with static_assert()
  printk: Make linux/printk.h self-contained
  doc:kmsg: explicitly state the return value in case of SEEK_CUR
  Replace HTTP links with HTTPS ones: vsprintf
  hvc: unify console setup naming
  console: Fix trivia typo 'change' -> 'chance'
  console: Propagate error code from console ->setup()
  tty: hvc: Return proper error code from console ->setup() hook
  serial: sunzilog: Return proper error code from console ->setup() hook
  serial: sunsab: Return proper error code from console ->setup() hook
  mips: Return proper error code from console ->setup() hook
parents 95ffa676 57e60db3
......@@ -56,6 +56,17 @@ Description: The /dev/kmsg character device node provides userspace access
seek after the last record available at the time
the last SYSLOG_ACTION_CLEAR was issued.
Other seek operations or offsets are not supported because of
the special behavior this device has. The device allows to read
or write only whole variable length messages (records) that are
stored in a ring buffer.
Because of the non-standard behavior also the error values are
non-standard. -ESPIPE is returned for non-zero offset. -EINVAL
is returned for other operations, e.g. SEEK_CUR. This behavior
and values are historical and could not be modified without the
risk of breaking userspace.
The output format consists of a prefix carrying the syslog
prefix including priority and facility, the 64 bit message
sequence number and the monotonic timestamp in microseconds,
......
......@@ -317,7 +317,7 @@ colon-separators. Leading zeros are always used.
The additional ``c`` specifier can be used with the ``I`` specifier to
print a compressed IPv6 address as described by
http://tools.ietf.org/html/rfc5952
https://tools.ietf.org/html/rfc5952
Passed by reference.
......@@ -341,7 +341,7 @@ The additional ``p``, ``f``, and ``s`` specifiers are used to specify port
flowinfo a ``/`` and scope a ``%``, each followed by the actual value.
In case of an IPv6 address the compressed IPv6 address as described by
http://tools.ietf.org/html/rfc5952 is being used if the additional
https://tools.ietf.org/html/rfc5952 is being used if the additional
specifier ``c`` is given. The IPv6 address is surrounded by ``[``, ``]`` in
case of additional specifiers ``p``, ``f`` or ``s`` as suggested by
https://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-07
......
......@@ -28,7 +28,9 @@ static void prom_console_write(struct console *co, const char *s,
static int prom_console_setup(struct console *co, char *options)
{
return !(prom_flags & PROM_FLAG_USE_AS_CONSOLE);
if (prom_flags & PROM_FLAG_USE_AS_CONSOLE)
return 0;
return -ENODEV;
}
static struct console arc_cons = {
......
......@@ -2,7 +2,7 @@
#ifndef _ASM_S390_BUG_H
#define _ASM_S390_BUG_H
#include <linux/kernel.h>
#include <linux/compiler.h>
#ifdef CONFIG_BUG
......
......@@ -603,7 +603,7 @@ static void xen_hvm_early_write(uint32_t vtermno, const char *str, int len) { }
#endif
#ifdef CONFIG_EARLY_PRINTK
static int __init xenboot_setup_console(struct console *console, char *string)
static int __init xenboot_console_setup(struct console *console, char *string)
{
static struct xencons_info xenboot;
......@@ -647,7 +647,7 @@ static void xenboot_write_console(struct console *console, const char *string,
struct console xenboot_console = {
.name = "xenboot",
.write = xenboot_write_console,
.setup = xenboot_setup_console,
.setup = xenboot_console_setup,
.flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
.index = -1,
};
......
......@@ -1128,7 +1128,7 @@ static int __init hvsi_console_setup(struct console *console, char *options)
int ret;
if (console->index < 0 || console->index >= hvsi_count)
return -1;
return -EINVAL;
hp = &hvsi_ports[console->index];
/* give the FSP a chance to change the baud rate when we re-open */
......
......@@ -886,7 +886,7 @@ static int sunsab_console_setup(struct console *con, char *options)
* though...
*/
if (up->port.type != PORT_SUNSAB)
return -1;
return -EINVAL;
printk("Console: ttyS%d (SAB82532)\n",
(sunsab_reg.minor - 64) + con->index);
......
......@@ -1221,7 +1221,7 @@ static int __init sunzilog_console_setup(struct console *con, char *options)
int baud, brg;
if (up->port.type != PORT_SUNZILOG)
return -1;
return -EINVAL;
printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
(sunzilog_reg.minor - 64) + con->index, con->index);
......
......@@ -7,6 +7,7 @@
#include <linux/kern_levels.h>
#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/ratelimit_types.h>
extern const char linux_banner[];
extern const char linux_proc_banner[];
......
......@@ -2,41 +2,10 @@
#ifndef _LINUX_RATELIMIT_H
#define _LINUX_RATELIMIT_H
#include <linux/param.h>
#include <linux/ratelimit_types.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
#define DEFAULT_RATELIMIT_BURST 10
/* issue num suppressed message on exit */
#define RATELIMIT_MSG_ON_RELEASE BIT(0)
struct ratelimit_state {
raw_spinlock_t lock; /* protect the state */
int interval;
int burst;
int printed;
int missed;
unsigned long begin;
unsigned long flags;
};
#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) { \
.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
.interval = interval_init, \
.burst = burst_init, \
}
#define RATELIMIT_STATE_INIT_DISABLED \
RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)
#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
\
struct ratelimit_state name = \
RATELIMIT_STATE_INIT(name, interval_init, burst_init) \
static inline void ratelimit_state_init(struct ratelimit_state *rs,
int interval, int burst)
{
......@@ -73,9 +42,6 @@ ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
extern struct ratelimit_state printk_ratelimit_state;
extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
#define __ratelimit(state) ___ratelimit(state, __func__)
#ifdef CONFIG_PRINTK
#define WARN_ON_RATELIMIT(condition, state) ({ \
......
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_RATELIMIT_TYPES_H
#define _LINUX_RATELIMIT_TYPES_H
#include <linux/bits.h>
#include <linux/param.h>
#include <linux/spinlock_types.h>
#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
#define DEFAULT_RATELIMIT_BURST 10
/* issue num suppressed message on exit */
#define RATELIMIT_MSG_ON_RELEASE BIT(0)
struct ratelimit_state {
raw_spinlock_t lock; /* protect the state */
int interval;
int burst;
int printed;
int missed;
unsigned long begin;
unsigned long flags;
};
#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) { \
.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
.interval = interval_init, \
.burst = burst_init, \
}
#define RATELIMIT_STATE_INIT_DISABLED \
RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)
#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
\
struct ratelimit_state name = \
RATELIMIT_STATE_INIT(name, interval_init, burst_init) \
extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
#define __ratelimit(state) ___ratelimit(state, __func__)
#endif /* _LINUX_RATELIMIT_TYPES_H */
......@@ -943,6 +943,14 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf,
return ret;
}
/*
* Be careful when modifying this function!!!
*
* Only few operations are supported because the device works only with the
* entire variable length messages (records). Non-standard values are
* returned in the other cases and has been this way for quite some time.
* User space applications might depend on this behavior.
*/
static loff_t devkmsg_llseek(struct file *file, loff_t offset, int whence)
{
struct devkmsg_user *user = file->private_data;
......@@ -2658,7 +2666,7 @@ early_param("keep_bootcon", keep_bootcon_setup);
static int try_enable_new_console(struct console *newcon, bool user_specified)
{
struct console_cmdline *c;
int i;
int i, err;
for (i = 0, c = console_cmdline;
i < MAX_CMDLINECONSOLES && c->name[0];
......@@ -2681,8 +2689,8 @@ static int try_enable_new_console(struct console *newcon, bool user_specified)
return 0;
if (newcon->setup &&
newcon->setup(newcon, c->options) != 0)
return -EIO;
(err = newcon->setup(newcon, c->options)) != 0)
return err;
}
newcon->flags |= CON_ENABLED;
if (i == preferred_console) {
......@@ -2695,7 +2703,7 @@ static int try_enable_new_console(struct console *newcon, bool user_specified)
/*
* Some consoles, such as pstore and netconsole, can be enabled even
* without matching. Accept the pre-enabled consoles only when match()
* and setup() had a change to be called.
* and setup() had a chance to be called.
*/
if (newcon->flags & CON_ENABLED && c->user_specified == user_specified)
return 0;
......
......@@ -381,6 +381,9 @@ int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
static_assert(ZEROPAD == ('0' - ' '));
static_assert(SMALL == ' ');
enum format_type {
FORMAT_TYPE_NONE, /* Just a string part */
FORMAT_TYPE_WIDTH,
......@@ -507,7 +510,7 @@ char *number(char *buf, char *end, unsigned long long num,
/* zero or space padding */
if (!(spec.flags & LEFT)) {
char c = ' ' + (spec.flags & ZEROPAD);
BUILD_BUG_ON(' ' + ZEROPAD != '0');
while (--field_width >= 0) {
if (buf < end)
*buf = c;
......@@ -1934,7 +1937,7 @@ char *flags_string(char *buf, char *end, void *flags_ptr,
names = vmaflag_names;
break;
case 'g':
flags = *(gfp_t *)flags_ptr;
flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
names = gfpflag_names;
break;
default:
......@@ -1976,12 +1979,6 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
char *buf_start = buf;
struct property *prop;
bool has_mult, pass;
static const struct printf_spec num_spec = {
.flags = SMALL,
.field_width = -1,
.precision = -1,
.base = 10,
};
struct printf_spec str_spec = spec;
str_spec.field_width = -1;
......@@ -2021,7 +2018,7 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
str_spec.precision = precision;
break;
case 'p': /* phandle */
buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);
break;
case 'P': /* path-spec */
p = fwnode_get_name(of_fwnode_handle(dn));
......@@ -2134,7 +2131,7 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
* [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
* - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
* - 'I[6S]c' for IPv6 addresses printed as specified by
* http://tools.ietf.org/html/rfc5952
* https://tools.ietf.org/html/rfc5952
* - 'E[achnops]' For an escaped buffer, where rules are defined by combination
* of the following flags (see string_escape_mem() for the
* details):
......
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