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vsprintf.c: use noinline_for_stack
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Mark static functions with noinline_for_stack

Before:

  akpm:/usr/src/25> objdump -d lib/vsprintf.o | perl scripts/checkstack.pl
  0x00000e82 pointer [vsprintf.o]:                        344
  0x0000198c pointer [vsprintf.o]:                        344
  0x000025d6 scnprintf [vsprintf.o]:                      216
  0x00002648 scnprintf [vsprintf.o]:                      216
  0x00002565 snprintf [vsprintf.o]:                       208
  0x0000267c sprintf [vsprintf.o]:                        208
  0x000030a3 bprintf [vsprintf.o]:                        208
  0x00003b1e sscanf [vsprintf.o]:                         208
  0x00000608 number [vsprintf.o]:                         136
  0x00000937 number [vsprintf.o]:                         136

After:

  akpm:/usr/src/25> objdump -d lib/vsprintf.o | perl scripts/checkstack.pl
  0x00000a7c symbol_string [vsprintf.o]:                  248
  0x00000ae8 symbol_string [vsprintf.o]:                  248
  0x00002310 scnprintf [vsprintf.o]:                      216
  0x00002382 scnprintf [vsprintf.o]:                      216
  0x0000229f snprintf [vsprintf.o]:                       208
  0x000023b6 sprintf [vsprintf.o]:                        208
  0x00002ddd bprintf [vsprintf.o]:                        208
  0x00003858 sscanf [vsprintf.o]:                         208
  0x00000625 number [vsprintf.o]:                         136
  0x00000954 number [vsprintf.o]:                         136

Signed-off-by: Joe Perches <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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@JoePerches @torvalds
JoePerches authored and torvalds committed May 25, 2010
1 parent 59592d0 commit cf3b429
Showing 1 changed file with 42 additions and 25 deletions.
67 changes: 42 additions & 25 deletions lib/vsprintf.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -267,7 +267,8 @@ int strict_strtoll(const char *cp, unsigned int base, long long *res)
}
EXPORT_SYMBOL(strict_strtoll);

static int skip_atoi(const char **s)
static noinline_for_stack
int skip_atoi(const char **s)
{
int i = 0;

Expand All @@ -287,7 +288,8 @@ static int skip_atoi(const char **s)
/* Formats correctly any integer in [0,99999].
* Outputs from one to five digits depending on input.
* On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
static char *put_dec_trunc(char *buf, unsigned q)
static noinline_for_stack
char *put_dec_trunc(char *buf, unsigned q)
{
unsigned d3, d2, d1, d0;
d1 = (q>>4) & 0xf;
Expand Down Expand Up @@ -324,7 +326,8 @@ static char *put_dec_trunc(char *buf, unsigned q)
return buf;
}
/* Same with if's removed. Always emits five digits */
static char *put_dec_full(char *buf, unsigned q)
static noinline_for_stack
char *put_dec_full(char *buf, unsigned q)
{
/* BTW, if q is in [0,9999], 8-bit ints will be enough, */
/* but anyway, gcc produces better code with full-sized ints */
Expand Down Expand Up @@ -366,7 +369,8 @@ static char *put_dec_full(char *buf, unsigned q)
return buf;
}
/* No inlining helps gcc to use registers better */
static noinline char *put_dec(char *buf, unsigned long long num)
static noinline_for_stack
char *put_dec(char *buf, unsigned long long num)
{
while (1) {
unsigned rem;
Expand Down Expand Up @@ -417,8 +421,9 @@ struct printf_spec {
s16 precision; /* # of digits/chars */
};

static char *number(char *buf, char *end, unsigned long long num,
struct printf_spec spec)
static noinline_for_stack
char *number(char *buf, char *end, unsigned long long num,
struct printf_spec spec)
{
/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
Expand Down Expand Up @@ -537,7 +542,8 @@ static char *number(char *buf, char *end, unsigned long long num,
return buf;
}

static char *string(char *buf, char *end, const char *s, struct printf_spec spec)
static noinline_for_stack
char *string(char *buf, char *end, const char *s, struct printf_spec spec)
{
int len, i;

Expand Down Expand Up @@ -567,8 +573,9 @@ static char *string(char *buf, char *end, const char *s, struct printf_spec spec
return buf;
}

static char *symbol_string(char *buf, char *end, void *ptr,
struct printf_spec spec, char ext)
static noinline_for_stack
char *symbol_string(char *buf, char *end, void *ptr,
struct printf_spec spec, char ext)
{
unsigned long value = (unsigned long) ptr;
#ifdef CONFIG_KALLSYMS
Expand All @@ -588,8 +595,9 @@ static char *symbol_string(char *buf, char *end, void *ptr,
#endif
}

static char *resource_string(char *buf, char *end, struct resource *res,
struct printf_spec spec, const char *fmt)
static noinline_for_stack
char *resource_string(char *buf, char *end, struct resource *res,
struct printf_spec spec, const char *fmt)
{
#ifndef IO_RSRC_PRINTK_SIZE
#define IO_RSRC_PRINTK_SIZE 6
Expand Down Expand Up @@ -690,8 +698,9 @@ static char *resource_string(char *buf, char *end, struct resource *res,
return string(buf, end, sym, spec);
}

static char *mac_address_string(char *buf, char *end, u8 *addr,
struct printf_spec spec, const char *fmt)
static noinline_for_stack
char *mac_address_string(char *buf, char *end, u8 *addr,
struct printf_spec spec, const char *fmt)
{
char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
char *p = mac_addr;
Expand All @@ -714,7 +723,8 @@ static char *mac_address_string(char *buf, char *end, u8 *addr,
return string(buf, end, mac_addr, spec);
}

static char *ip4_string(char *p, const u8 *addr, const char *fmt)
static noinline_for_stack
char *ip4_string(char *p, const u8 *addr, const char *fmt)
{
int i;
bool leading_zeros = (fmt[0] == 'i');
Expand Down Expand Up @@ -763,7 +773,8 @@ static char *ip4_string(char *p, const u8 *addr, const char *fmt)
return p;
}

static char *ip6_compressed_string(char *p, const char *addr)
static noinline_for_stack
char *ip6_compressed_string(char *p, const char *addr)
{
int i, j, range;
unsigned char zerolength[8];
Expand Down Expand Up @@ -843,7 +854,8 @@ static char *ip6_compressed_string(char *p, const char *addr)
return p;
}

static char *ip6_string(char *p, const char *addr, const char *fmt)
static noinline_for_stack
char *ip6_string(char *p, const char *addr, const char *fmt)
{
int i;

Expand All @@ -858,8 +870,9 @@ static char *ip6_string(char *p, const char *addr, const char *fmt)
return p;
}

static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
static noinline_for_stack
char *ip6_addr_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
{
char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];

Expand All @@ -871,8 +884,9 @@ static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
return string(buf, end, ip6_addr, spec);
}

static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
static noinline_for_stack
char *ip4_addr_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
{
char ip4_addr[sizeof("255.255.255.255")];

Expand All @@ -881,8 +895,9 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
return string(buf, end, ip4_addr, spec);
}

static char *uuid_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
static noinline_for_stack
char *uuid_string(char *buf, char *end, const u8 *addr,
struct printf_spec spec, const char *fmt)
{
char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
char *p = uuid;
Expand Down Expand Up @@ -970,8 +985,9 @@ static char *uuid_string(char *buf, char *end, const u8 *addr,
* function pointers are really function descriptors, which contain a
* pointer to the real address.
*/
static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
struct printf_spec spec)
static noinline_for_stack
char *pointer(const char *fmt, char *buf, char *end, void *ptr,
struct printf_spec spec)
{
if (!ptr)
return string(buf, end, "(null)", spec);
Expand Down Expand Up @@ -1040,7 +1056,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
* @precision: precision of a number
* @qualifier: qualifier of a number (long, size_t, ...)
*/
static int format_decode(const char *fmt, struct printf_spec *spec)
static noinline_for_stack
int format_decode(const char *fmt, struct printf_spec *spec)
{
const char *start = fmt;

Expand Down

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