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authorPetr Mladek <pmladek@suse.com>2019-04-17 14:53:47 +0300
committerPetr Mladek <pmladek@suse.com>2019-04-26 17:20:20 +0300
commit0b74d4d763fd4ee9daa53889324300587c015338 (patch)
treef3ea32ac58c04f182fda454f6ed7a009d7bb2452 /lib/vsprintf.c
parent798cc27a305e7b35b7bff3a71257e6fe57f70bc1 (diff)
downloadlinux-0b74d4d763fd4ee9daa53889324300587c015338.tar.xz
vsprintf: Consolidate handling of unknown pointer specifiers
There are few printk formats that make sense only with two or more specifiers. Also some specifiers make sense only when a kernel feature is enabled. The handling of unknown specifiers is inconsistent and not helpful. Using WARN() looks like an overkill for this type of error. pr_warn() is not good either. It would by handled via printk_safe buffer and it might be hard to match it with the problematic string. A reasonable compromise seems to be writing the unknown format specifier into the original string with a question mark, for example (%pC?). It should be self-explaining enough. Note that it is in brackets to follow the (null) style. Note that it introduces a warning about that test_hashed() function is unused. It is going to be used again by a later patch. Link: http://lkml.kernel.org/r/20190417115350.20479-8-pmladek@suse.com To: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "Tobin C . Harding" <me@tobin.cc> Cc: Joe Perches <joe@perches.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: linux-kernel@vger.kernel.org Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 9817d171f608..f471a658422f 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1435,6 +1435,8 @@ static noinline_for_stack
char *ip_addr_string(char *buf, char *end, const void *ptr,
struct printf_spec spec, const char *fmt)
{
+ char *err_fmt_msg;
+
switch (fmt[1]) {
case '6':
return ip6_addr_string(buf, end, ptr, spec, fmt);
@@ -1457,7 +1459,8 @@ char *ip_addr_string(char *buf, char *end, const void *ptr,
}}
}
- return ptr_to_id(buf, end, ptr, spec);
+ err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
+ return string_nocheck(buf, end, err_fmt_msg, spec);
}
static noinline_for_stack
@@ -1585,7 +1588,7 @@ char *netdev_bits(char *buf, char *end, const void *addr,
size = sizeof(netdev_features_t);
break;
default:
- return ptr_to_id(buf, end, addr, spec);
+ return string_nocheck(buf, end, "(%pN?)", spec);
}
return special_hex_number(buf, end, num, size);
@@ -1689,7 +1692,7 @@ char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
case 'R':
return rtc_str(buf, end, (const struct rtc_time *)ptr, fmt);
default:
- return ptr_to_id(buf, end, ptr, spec);
+ return string_nocheck(buf, end, "(%ptR?)", spec);
}
}
@@ -1697,7 +1700,10 @@ static noinline_for_stack
char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
const char *fmt)
{
- if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
+ if (!IS_ENABLED(CONFIG_HAVE_CLK))
+ return string_nocheck(buf, end, "(%pC?)", spec);
+
+ if (!clk)
return string(buf, end, NULL, spec);
switch (fmt[1]) {
@@ -1706,7 +1712,7 @@ char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
#ifdef CONFIG_COMMON_CLK
return string(buf, end, __clk_get_name(clk), spec);
#else
- return ptr_to_id(buf, end, clk, spec);
+ return string_nocheck(buf, end, "(%pC?)", spec);
#endif
}
}
@@ -1739,7 +1745,8 @@ char *format_flags(char *buf, char *end, unsigned long flags,
}
static noinline_for_stack
-char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
+char *flags_string(char *buf, char *end, void *flags_ptr,
+ struct printf_spec spec, const char *fmt)
{
unsigned long flags;
const struct trace_print_flags *names;
@@ -1760,8 +1767,7 @@ char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
names = gfpflag_names;
break;
default:
- WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]);
- return buf;
+ return string_nocheck(buf, end, "(%pG?)", spec);
}
return format_flags(buf, end, flags, names);
@@ -1817,7 +1823,7 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
str_spec.field_width = -1;
if (!IS_ENABLED(CONFIG_OF))
- return string_nocheck(buf, end, "(!OF)", spec);
+ return string_nocheck(buf, end, "(%pOF?)", spec);
if ((unsigned long)dn < PAGE_SIZE)
return string_nocheck(buf, end, "(null)", spec);
@@ -1896,7 +1902,7 @@ static char *kobject_string(char *buf, char *end, void *ptr,
return device_node_string(buf, end, ptr, spec, fmt + 1);
}
- return ptr_to_id(buf, end, ptr, spec);
+ return string_nocheck(buf, end, "(%pO?)", spec);
}
/*
@@ -2091,7 +2097,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
#endif
case 'G':
- return flags_string(buf, end, ptr, fmt);
+ return flags_string(buf, end, ptr, spec, fmt);
case 'O':
return kobject_string(buf, end, ptr, spec, fmt);
case 'x':