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LinuxKPI: add kstrtoint_from_user() and DECLARE_FLEX_ARRAY()

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Add an implementation of kstrtoint_from_user() based on the other
implementations and an attempt at DECLARE_FLEX_ARRAY() which works
for the driver needing it.

MFC after:	3 days
Reviewed by:	hselasky
Differential Revision: https://reviews.freebsd.org/D34231
This commit is contained in:
Bjoern A. Zeeb 2022-02-09 11:58:40 +00:00
parent 0c37ffda79
commit c840d5cec2
1 changed files with 18 additions and 0 deletions
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18
sys/compat/linuxkpi/common/include/linux/kernel.h
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@ -509,6 +509,21 @@ kstrtobool_from_user(const char __user *s, size_t count, bool *res)
return (kstrtobool(buf, res));
}
static inline int
kstrtoint_from_user(const char __user *s, size_t count, unsigned int base,
int *p)
{
char buf[36] = {};
if (count > (sizeof(buf) - 1))
count = (sizeof(buf) - 1);
if (copy_from_user(buf, s, count))
return (-EFAULT);
return (kstrtoint(buf, base, p));
}
static inline int
kstrtou8_from_user(const char __user *s, size_t count, unsigned int base,
u8 *p)
@ -684,6 +699,9 @@ hex2bin(uint8_t *bindst, const char *hexsrc, size_t binlen)
return (0);
}
#define DECLARE_FLEX_ARRAY(_t, _n) \
struct { struct { } __dummy_ ## _n; _t _n[]; }
/*
* Checking if an option is defined would be easy if we could do CPP inside CPP.
* The defined case whether -Dxxx or -Dxxx=1 are easy to deal with. In either