LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

(cherry picked from

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

(cherry picked from commit 307f78f3ed90a4145eeb2c8cc79bc95b2666f57a)

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LinuxKPI: add strreplace() to string.h

Add strreplace() needed by a driver.

(cherry picked from commit a5e2a27dca4bd5f4795b42ac598d4fff1c3a6eae)

LinuxKPI: Implement strscpy

strscpy copies the src string, or as much of it as fits, into the dst
buffer. The dst buffer is always NUL terminated, unless it's zero-sized.
strscpy returns the number

LinuxKPI: Implement strscpy

strscpy copies the src string, or as much of it as fits, into the dst
buffer. The dst buffer is always NUL terminated, unless it's zero-sized.
strscpy returns the number of characters copied (not including the
trailing NUL) or -E2BIG if len is 0 or src was truncated.

Currently drm-kmod replaces strscpy with strncpy that is not quite
correct as strncpy does not NUL-terminate truncated strings and returns
different values on exit.

Reviewed by: hselasky, imp, manu
Differential revision: https://reviews.freebsd.org/D31005

(cherry picked from commit 019391bf852771070cb739900f9e20ae6c41c746)

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linuxkpi: Ignore NULL pointers passed to string parameter of kstr(n)dup

That follows Linux and fixes related drm-kmod-5.3 panic.

Reviewed by: imp, hselasky
MFC after: 1 week
Differential Revision:

linuxkpi: Ignore NULL pointers passed to string parameter of kstr(n)dup

That follows Linux and fixes related drm-kmod-5.3 panic.

Reviewed by: imp, hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D25657

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linuxkpi: Add str_has_prefix

This function test if the string str begins with the string pointed
at by prefix.

Reviewed by: hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd

linuxkpi: Add str_has_prefix

This function test if the string str begins with the string pointed
at by prefix.

Reviewed by: hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D23767

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Implement memdup_user_nul() in the LinuxKPI.

MFC after: 1 week
Submitted by: Johannes Lundberg <[email protected]>
Sponsored by: Mellanox Technologies

Implement more string functions in the LinuxKPI.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Add more functions to the LinuxKPI.

Define strnicmp as a function macro instead of a regular macro while
at it.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Finish process of moving the LinuxKPI module into the default kernel build.

- Move all files related to the LinuxKPI into sys/compat/linuxkpi and
its subfolders.
- Update sys/conf/files and some M

Finish process of moving the LinuxKPI module into the default kernel build.

- Move all files related to the LinuxKPI into sys/compat/linuxkpi and
its subfolders.
- Update sys/conf/files and some Makefiles to use new file locations.
- Added description of COMPAT_LINUXKPI to sys/conf/NOTES which in turn
adds the LinuxKPI to all LINT builds.
- The LinuxKPI can be added to the kernel by setting the
COMPAT_LINUXKPI option. The OFED kernel option no longer builds the
LinuxKPI into the kernel. This was done to keep the build rules for
the LinuxKPI in sys/conf/files simple.
- Extend the LinuxKPI module to include support for USB by moving the
Linux USB compat from usb.ko to linuxkpi.ko.
- Bump the FreeBSD_version.
- A universe kernel build has been done.

Reviewed by: np @ (cxgb and cxgbe related changes only)
Sponsored by: Mellanox Technologies

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