LinuxKPI: Import vanilla linux/overflow.h

It is dual-licensed (GPLv2 & MIT) and self-contained header file.
No need to reimplement it.

Sponsored by: Serenity CyberSecurity, LLC
Reviewed by: emaste

LinuxKPI: Import vanilla linux/overflow.h

It is dual-licensed (GPLv2 & MIT) and self-contained header file.
No need to reimplement it.

Sponsored by: Serenity CyberSecurity, LLC
Reviewed by: emaste
MFC after: 1 week

(cherry picked from commit 3208d4ad2b8320a24af4a8293f7fd3ef9c35caa6)

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LinuxKPI: Add strnchr function

strnchr() finds a character in a length limited string.

Sponsored by: Serenity CyberSecurity, LLC
Reviewed by: emaste
MFC after: 1 month

(cherry picked from commit 1

LinuxKPI: Add strnchr function

strnchr() finds a character in a length limited string.

Sponsored by: Serenity CyberSecurity, LLC
Reviewed by: emaste
MFC after: 1 month

(cherry picked from commit 19703887666da09c79c571bc78f0923bae62be91)

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LinuxKPI: add kvmemdup()

Add kvmemdup() as a variant of kmemdup(). While currently it could
just call kmemdup() we duplicate the code and use kvmalloc() in case
someone will change the implementati

LinuxKPI: add kvmemdup()

Add kvmemdup() as a variant of kmemdup(). While currently it could
just call kmemdup() we duplicate the code and use kvmalloc() in case
someone will change the implementation of kvmalloc/kvfree in slab.h.
This is used by an updated wireless driver.

Sponsored by: The FreeBSD Foundation
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D45181

(cherry picked from commit 8e4b8e9d807aa379d2a1c3aaac2537ba7d6bf0bf)

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LinuxKPI: implement memzero_explicit()

Sponsored by: The FreeBSD Foundation
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D44586

(cherry picked from commit 218b2ccf8cc90698

LinuxKPI: implement memzero_explicit()

Sponsored by: The FreeBSD Foundation
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D44586

(cherry picked from commit 218b2ccf8cc90698487515c681f3e3453b0dcead)

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LinuxKPI: implement memset_after()

memset_after() is needed by iwlwifi d3.c.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D43644

(cherry picked from commit 2d9d35837d8ea3

LinuxKPI: implement memset_after()

memset_after() is needed by iwlwifi d3.c.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D43644

(cherry picked from commit 2d9d35837d8ea3ee7d7447d63a8755d45ec2fd96)

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

linuxkpi: Add `strscpy_pad()` to <linux/string.h>

It's the same as `strscpy()` except that it fills the rest of the
destination buffer with zeroes if the source buffer is shorter.

Reviewed by: manu

linuxkpi: Add `strscpy_pad()` to <linux/string.h>

It's the same as `strscpy()` except that it fills the rest of the
destination buffer with zeroes if the source buffer is shorter.

Reviewed by: manu
Approved by: manu

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linuxkpi: Add <linux/stdarg.h> + include it from <linux/string.h>

The <stdarg.h> header was moved in Linux 5.15.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.o

linuxkpi: Add <linux/stdarg.h> + include it from <linux/string.h>

The <stdarg.h> header was moved in Linux 5.15.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38540

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LinuxKPI: add memset_startat macro

Add a memset_startat() macro which sets a pattern from a struct member
to the end of the struct. Needed by a wireless driver.

MFC after: 3 days
Reviewed by: ema

LinuxKPI: add memset_startat macro

Add a memset_startat() macro which sets a pattern from a struct member
to the end of the struct. Needed by a wireless driver.

MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D37389

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LinuxKPI: string.h implement memcpy_and_pad()

Add a memcpy variant which takes length of source and destination
buffers and a padding character in case there is free space in the
destination. This

LinuxKPI: string.h implement memcpy_and_pad()

Add a memcpy variant which takes length of source and destination
buffers and a padding character in case there is free space in the
destination. This is used by a wireless driver.

MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D37226

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linuxkpi: Add strndup_user

Reviewed by: hselasky, markj
Differential Revision: https://reviews.freebsd.org/D36350
Sponsored by: Google, Inc. (GSoC 2022)

linuxkpi: Add some memset functions

Needed by drm-kmod

Obtained from: OpenBSD
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D35943

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

LinuxKPI: add strreplace() to string.h

Add strreplace() needed by a driver.
MFC after: 3 days

Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D32597

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
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D31005

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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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