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lib/vsprintf: refactor duplicate code to special_hex_number()

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special_hex_number() is a helper to print a fixed size type in a hex
format with '0x' prefix, zero padding, and small letters.  In the module
we have already several copies of such code.  Consolidate them under
special_hex_number() helper.

There are couple of differences though.

It seems nobody cared about the output in case of CONFIG_KALLSYMS=n,
when printing symbol address, because the asked field width is not
enough to care last 2 characters in the string represantation of the
pointer.  Fixed here.

The %pNF specifier used to be allowed with a specific field width,
though there is neither any user of it nor mention the possibility in
the documentation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Shevchenko 2016-01-15 16:59:18 -08:00 committed by Linus Torvalds
parent 64c734be70
commit 3cab1e7112
1 changed files with 27 additions and 26 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

53
lib/vsprintf.c
View file

@ -515,6 +515,20 @@ char *number(char *buf, char *end, unsigned long long num,
return buf;
}
static noinline_for_stack
char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
{
struct printf_spec spec;
spec.type = FORMAT_TYPE_PTR;
spec.field_width = 2 + 2 * size; /* 0x + hex */
spec.flags = SPECIAL | SMALL | ZEROPAD;
spec.base = 16;
spec.precision = -1;
return number(buf, end, num, spec);
}
static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
{
size_t size;
@ -670,11 +684,7 @@ char *symbol_string(char *buf, char *end, void *ptr,
return string(buf, end, sym, spec);
#else
spec.field_width = 2 * sizeof(void *);
spec.flags |= SPECIAL | SMALL | ZEROPAD;
spec.base = 16;
return number(buf, end, value, spec);
return special_hex_number(buf, end, value, sizeof(void *));
#endif
}
@ -1336,39 +1346,33 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
}
static
char *netdev_feature_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec)
char *netdev_feature_string(char *buf, char *end, const void *addr)
{
spec.flags |= SPECIAL | SMALL | ZEROPAD;
if (spec.field_width == -1)
spec.field_width = 2 + 2 * sizeof(netdev_features_t);
spec.base = 16;
unsigned long long num = *(const netdev_features_t *)addr;
int size = sizeof(netdev_features_t);
return number(buf, end, *(const netdev_features_t *)addr, spec);
return special_hex_number(buf, end, num, size);
}
static noinline_for_stack
char *address_val(char *buf, char *end, const void *addr,
struct printf_spec spec, const char *fmt)
char *address_val(char *buf, char *end, const void *addr, const char *fmt)
{
unsigned long long num;
spec.flags |= SPECIAL | SMALL | ZEROPAD;
spec.base = 16;
int size;
switch (fmt[1]) {
case 'd':
num = *(const dma_addr_t *)addr;
spec.field_width = sizeof(dma_addr_t) * 2 + 2;
size = sizeof(dma_addr_t);
break;
case 'p':
default:
num = *(const phys_addr_t *)addr;
spec.field_width = sizeof(phys_addr_t) * 2 + 2;
size = sizeof(phys_addr_t);
break;
}
return number(buf, end, num, spec);
return special_hex_number(buf, end, num, size);
}
static noinline_for_stack
@ -1387,10 +1391,7 @@ 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
spec.base = 16;
spec.field_width = sizeof(unsigned long) * 2 + 2;
spec.flags |= SPECIAL | SMALL | ZEROPAD;
return number(buf, end, (unsigned long)clk, spec);
return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long));
#endif
}
}
@ -1622,11 +1623,11 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
case 'N':
switch (fmt[1]) {
case 'F':
return netdev_feature_string(buf, end, ptr, spec);
return netdev_feature_string(buf, end, ptr);
}
break;
case 'a':
return address_val(buf, end, ptr, spec, fmt);
return address_val(buf, end, ptr, fmt);
case 'd':
return dentry_name(buf, end, ptr, spec, fmt);
case 'C':