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Merge tag 'printk-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

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Pull printk updates from Petr Mladek:

 - Help userspace log daemons to catch up with a flood of messages. They
   will get woken after each message even if the console is far behind
   and handled by another process.

 - Flush printk safe buffers safely even when panic() happens in the
   normal context.

 - Fix possible va_list reuse when race happened in printk_safe().

 - Remove %pCr printf format to prevent sleeping in the atomic context.

 - Misc vsprintf code cleanup.

* tag 'printk-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  printk: drop in_nmi check from printk_safe_flush_on_panic()
  lib/vsprintf: Remove atomic-unsafe support for %pCr
  serial: sh-sci: Stop using printk format %pCr
  thermal: bcm2835: Stop using printk format %pCr
  clk: renesas: cpg-mssr: Stop using printk format %pCr
  printk: fix possible reuse of va_list variable
  printk: wake up klogd in vprintk_emit
  vsprintf: Tweak pF/pf comment
  lib/vsprintf: Mark expected switch fall-through
  lib/vsprintf: Replace space with '_' before crng is ready
  lib/vsprintf: Deduplicate pointer_string()
  lib/vsprintf: Move pointer_string() upper
  lib/vsprintf: Make flag_spec global
  lib/vsprintf: Make strspec global
  lib/vsprintf: Make dec_spec global
  lib/test_printf: Mark big constant with UL
This commit is contained in:
Linus Torvalds
2018-06-06 16:04:55 -07:00
parent 0eb0061381 8bafa2a44f
commit d75ae5bdf2
8 changed files with 71 additions and 105 deletions
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133
lib/vsprintf.c
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@@ -703,6 +703,22 @@ char *symbol_string(char *buf, char *end, void *ptr,
#endif
}
static const struct printf_spec default_str_spec = {
.field_width = -1,
.precision = -1,
};
static const struct printf_spec default_flag_spec = {
.base = 16,
.precision = -1,
.flags = SPECIAL | SMALL,
};
static const struct printf_spec default_dec_spec = {
.base = 10,
.precision = -1,
};
static noinline_for_stack
char *resource_string(char *buf, char *end, struct resource *res,
struct printf_spec spec, const char *fmt)
@@ -732,21 +748,11 @@ char *resource_string(char *buf, char *end, struct resource *res,
.precision = -1,
.flags = SMALL | ZEROPAD,
};
static const struct printf_spec dec_spec = {
.base = 10,
.precision = -1,
.flags = 0,
};
static const struct printf_spec str_spec = {
.field_width = -1,
.precision = 10,
.flags = LEFT,
};
static const struct printf_spec flag_spec = {
.base = 16,
.precision = -1,
.flags = SPECIAL | SMALL,
};
/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
* 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
@@ -770,10 +776,10 @@ char *resource_string(char *buf, char *end, struct resource *res,
specp = &mem_spec;
} else if (res->flags & IORESOURCE_IRQ) {
p = string(p, pend, "irq ", str_spec);
specp = &dec_spec;
specp = &default_dec_spec;
} else if (res->flags & IORESOURCE_DMA) {
p = string(p, pend, "dma ", str_spec);
specp = &dec_spec;
specp = &default_dec_spec;
} else if (res->flags & IORESOURCE_BUS) {
p = string(p, pend, "bus ", str_spec);
specp = &bus_spec;
@@ -803,7 +809,7 @@ char *resource_string(char *buf, char *end, struct resource *res,
p = string(p, pend, " disabled", str_spec);
} else {
p = string(p, pend, " flags ", str_spec);
p = number(p, pend, res->flags, flag_spec);
p = number(p, pend, res->flags, default_flag_spec);
}
*p++ = ']';
*p = '\0';
@@ -913,9 +919,6 @@ char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
int cur, rbot, rtop;
bool first = true;
/* reused to print numbers */
spec = (struct printf_spec){ .base = 10 };
rbot = cur = find_first_bit(bitmap, nr_bits);
while (cur < nr_bits) {
rtop = cur;
@@ -930,13 +933,13 @@ char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
}
first = false;
buf = number(buf, end, rbot, spec);
buf = number(buf, end, rbot, default_dec_spec);
if (rbot < rtop) {
if (buf < end)
*buf = '-';
buf++;
buf = number(buf, end, rtop, spec);
buf = number(buf, end, rtop, default_dec_spec);
}
rbot = cur;
@@ -1354,11 +1357,9 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
return string(buf, end, uuid, spec);
}
int kptr_restrict __read_mostly;
static noinline_for_stack
char *restricted_pointer(char *buf, char *end, const void *ptr,
struct printf_spec spec)
char *pointer_string(char *buf, char *end, const void *ptr,
struct printf_spec spec)
{
spec.base = 16;
spec.flags |= SMALL;
@@ -1367,6 +1368,15 @@ char *restricted_pointer(char *buf, char *end, const void *ptr,
spec.flags |= ZEROPAD;
}
return number(buf, end, (unsigned long int)ptr, spec);
}
int kptr_restrict __read_mostly;
static noinline_for_stack
char *restricted_pointer(char *buf, char *end, const void *ptr,
struct printf_spec spec)
{
switch (kptr_restrict) {
case 0:
/* Always print %pK values */
@@ -1378,8 +1388,11 @@ char *restricted_pointer(char *buf, char *end, const void *ptr,
* kptr_restrict==1 cannot be used in IRQ context
* because its test for CAP_SYSLOG would be meaningless.
*/
if (in_irq() || in_serving_softirq() || in_nmi())
if (in_irq() || in_serving_softirq() || in_nmi()) {
if (spec.field_width == -1)
spec.field_width = 2 * sizeof(ptr);
return string(buf, end, "pK-error", spec);
}
/*
* Only print the real pointer value if the current
@@ -1404,7 +1417,7 @@ char *restricted_pointer(char *buf, char *end, const void *ptr,
break;
}
return number(buf, end, (unsigned long)ptr, spec);
return pointer_string(buf, end, ptr, spec);
}
static noinline_for_stack
@@ -1456,9 +1469,6 @@ char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
return string(buf, end, NULL, spec);
switch (fmt[1]) {
case 'r':
return number(buf, end, clk_get_rate(clk), spec);
case 'n':
default:
#ifdef CONFIG_COMMON_CLK
@@ -1474,23 +1484,13 @@ char *format_flags(char *buf, char *end, unsigned long flags,
const struct trace_print_flags *names)
{
unsigned long mask;
const struct printf_spec strspec = {
.field_width = -1,
.precision = -1,
};
const struct printf_spec numspec = {
.flags = SPECIAL|SMALL,
.field_width = -1,
.precision = -1,
.base = 16,
};
for ( ; flags && names->name; names++) {
mask = names->mask;
if ((flags & mask) != mask)
continue;
buf = string(buf, end, names->name, strspec);
buf = string(buf, end, names->name, default_str_spec);
flags &= ~mask;
if (flags) {
@@ -1501,7 +1501,7 @@ char *format_flags(char *buf, char *end, unsigned long flags,
}
if (flags)
buf = number(buf, end, flags, numspec);
buf = number(buf, end, flags, default_flag_spec);
return buf;
}
@@ -1548,22 +1548,18 @@ char *device_node_gen_full_name(const struct device_node *np, char *buf, char *e
{
int depth;
const struct device_node *parent = np->parent;
static const struct printf_spec strspec = {
.field_width = -1,
.precision = -1,
};
/* special case for root node */
if (!parent)
return string(buf, end, "/", strspec);
return string(buf, end, "/", default_str_spec);
for (depth = 0; parent->parent; depth++)
parent = parent->parent;
for ( ; depth >= 0; depth--) {
buf = string(buf, end, "/", strspec);
buf = string(buf, end, "/", default_str_spec);
buf = string(buf, end, device_node_name_for_depth(np, depth),
strspec);
default_str_spec);
}
return buf;
}
@@ -1655,20 +1651,6 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
return widen_string(buf, buf - buf_start, end, spec);
}
static noinline_for_stack
char *pointer_string(char *buf, char *end, const void *ptr,
struct printf_spec spec)
{
spec.base = 16;
spec.flags |= SMALL;
if (spec.field_width == -1) {
spec.field_width = 2 * sizeof(ptr);
spec.flags |= ZEROPAD;
}
return number(buf, end, (unsigned long int)ptr, spec);
}
static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
static siphash_key_t ptr_key __read_mostly;
@@ -1710,13 +1692,13 @@ early_initcall(initialize_ptr_random);
/* Maps a pointer to a 32 bit unique identifier. */
static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
{
const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
unsigned long hashval;
const int default_width = 2 * sizeof(ptr);
if (static_branch_unlikely(&not_filled_random_ptr_key)) {
spec.field_width = default_width;
spec.field_width = 2 * sizeof(ptr);
/* string length must be less than default_width */
return string(buf, end, "(ptrval)", spec);
return string(buf, end, str, spec);
}
#ifdef CONFIG_64BIT
@@ -1729,15 +1711,7 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
#else
hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
#endif
spec.flags |= SMALL;
if (spec.field_width == -1) {
spec.field_width = default_width;
spec.flags |= ZEROPAD;
}
spec.base = 16;
return number(buf, end, hashval, spec);
return pointer_string(buf, end, (const void *)hashval, spec);
}
/*
@@ -1750,10 +1724,10 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
*
* Right now we handle:
*
* - 'F' For symbolic function descriptor pointers with offset
* - 'f' For simple symbolic function names without offset
* - 'S' For symbolic direct pointers with offset
* - 's' For symbolic direct pointers without offset
* - 'S' For symbolic direct pointers (or function descriptors) with offset
* - 's' For symbolic direct pointers (or function descriptors) without offset
* - 'F' Same as 'S'
* - 'f' Same as 's'
* - '[FfSs]R' as above with __builtin_extract_return_addr() translation
* - 'B' For backtraced symbolic direct pointers with offset
* - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
@@ -1850,10 +1824,6 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
* ** When making changes please also update:
* Documentation/core-api/printk-formats.rst
*
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
* pointer to the real address.
*
* Note: The default behaviour (unadorned %p) is to hash the address,
* rendering it useful as a unique identifier.
*/
@@ -2129,6 +2099,7 @@ qualifier:
case 'x':
spec->flags |= SMALL;
/* fall through */
case 'X':
spec->base = 16;
@@ -3087,8 +3058,10 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
break;
case 'i':
base = 0;
/* fall through */
case 'd':
is_sign = true;
/* fall through */
case 'u':
break;
case '%':