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x86/boot: Add kstrtoul() from lib/ 

Add kstrtoul() to ../boot/ to be used by facilities there too.

 [
   bp: Massage, make _kstrtoul() static. Prepend function names with
   "boot_". This is a temporary workaround for build errors like:

   ld: arch/x86/boot/compressed/acpi.o: in function `count_immovable_mem_regions':
   acpi.c:(.text+0x463): undefined reference to `_kstrtoul'
   make[2]: *** [arch/x86/boot/compressed/Makefile:117: arch/x86/boot/compressed/vmlinux] Error 1

   due to the namespace clash between x86/boot/ and kernel proper.
   Future reorg will get rid of the linux/linux/ namespace as much as
   possible so that x86/boot/ can be independent from kernel proper. ]

Signed-off-by: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/1587645588-7130-2-git-send-email-vamshi.k.sthambamkadi@gmail.com
This commit is contained in:
Vamshi K Sthambamkadi 2020-04-23 18:09:47 +05:30 committed by Borislav Petkov
parent 767dea211c
commit 5fafbebc86
2 changed files with 43 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
arch/x86/boot/string.c
View File

@ -117,7 +117,6 @@ static unsigned int simple_guess_base(const char *cp)
* @endp: A pointer to the end of the parsed string will be placed here
* @base: The number base to use
*/
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
{
unsigned long long result = 0;
@ -335,3 +334,45 @@ int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
s++;
return _kstrtoull(s, base, res);
}
static int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
{
unsigned long long tmp;
int rv;
rv = kstrtoull(s, base, &tmp);
if (rv < 0)
return rv;
if (tmp != (unsigned long)tmp)
return -ERANGE;
*res = tmp;
return 0;
}
/**
* kstrtoul - convert a string to an unsigned long
* @s: The start of the string. The string must be null-terminated, and may also
* include a single newline before its terminating null. The first character
* may also be a plus sign, but not a minus sign.
* @base: The number base to use. The maximum supported base is 16. If base is
* given as 0, then the base of the string is automatically detected with the
* conventional semantics - If it begins with 0x the number will be parsed as a
* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
* parsed as an octal number. Otherwise it will be parsed as a decimal.
* @res: Where to write the result of the conversion on success.
*
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
* Used as a replacement for the simple_strtoull.
*/
int boot_kstrtoul(const char *s, unsigned int base, unsigned long *res)
{
/*
* We want to shortcut function call, but
* __builtin_types_compatible_p(unsigned long, unsigned long long) = 0.
*/
if (sizeof(unsigned long) == sizeof(unsigned long long) &&
__alignof__(unsigned long) == __alignof__(unsigned long long))
return kstrtoull(s, base, (unsigned long long *)res);
else
return _kstrtoul(s, base, res);
}

1
arch/x86/boot/string.h
View File

@ -30,4 +30,5 @@ extern unsigned long long simple_strtoull(const char *cp, char **endp,
unsigned int base);
int kstrtoull(const char *s, unsigned int base, unsigned long long *res);
int boot_kstrtoul(const char *s, unsigned int base, unsigned long *res);
#endif /* BOOT_STRING_H */