m68k: Use kernel's generic muldi3 libgcc function

Use the kernels own generic lib/muldi3.c implementation of muldi3 for
68K machines. Some 68K CPUs support 64bit multiplies so move the arch
specific

m68k: Use kernel's generic muldi3 libgcc function

Use the kernels own generic lib/muldi3.c implementation of muldi3 for
68K machines. Some 68K CPUs support 64bit multiplies so move the arch
specific umul_ppmm() macro into a header file that is included by
lib/muldi3.c. That way it can take advantage of the single instruction
when available.

There does not appear to be any existing mechanism for the generic
lib/muldi3.c code to pick up an external arch definition of umul_ppmm().
Create an arch specific libgcc.h that can optionally be included by
the system include/linux/libgcc.h to allow for this.

Somewhat oddly there is also a similar definition of umul_ppmm() in
the non-architecture code in lib/crypto/mpi/longlong.h for a wide range
or machines. Its presence ends up complicating the include setup and
means not being able to use something like compiler.h instead. Actually
there is a few other defines of umul_ppmm() macros spread around in
various architectures, but not directly usable for the m68k case.

Signed-off-by: Greg Ungerer <[email protected]>
Link: https://lore.kernel.org/[email protected]
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: Geert Uytterhoeven <[email protected]>

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libgcc: add forward declarations for generic library routines

With W=1 on platforms that use the generic gcc library routines
(csky/loongarch/mips/riscv/sh/xtensa):

lib/ashldi3.c:9:19: warning:

libgcc: add forward declarations for generic library routines

With W=1 on platforms that use the generic gcc library routines
(csky/loongarch/mips/riscv/sh/xtensa):

lib/ashldi3.c:9:19: warning: no previous prototype for '__ashldi3' [-Wmissing-prototypes]
9 | long long notrace __ashldi3(long long u, word_type b)
| ^~~~~~~~~
CC lib/ashrdi3.o
lib/ashrdi3.c:9:19: warning: no previous prototype for '__ashrdi3' [-Wmissing-prototypes]
9 | long long notrace __ashrdi3(long long u, word_type b)
| ^~~~~~~~~
CC lib/cmpdi2.o
lib/cmpdi2.c:9:19: warning: no previous prototype for '__cmpdi2' [-Wmissing-prototypes]
9 | word_type notrace __cmpdi2(long long a, long long b)
| ^~~~~~~~
CC lib/lshrdi3.o
lib/lshrdi3.c:9:19: warning: no previous prototype for '__lshrdi3' [-Wmissing-prototypes]
9 | long long notrace __lshrdi3(long long u, word_type b)
| ^~~~~~~~~
CC lib/muldi3.o
lib/muldi3.c:49:19: warning: no previous prototype for '__muldi3' [-Wmissing-prototypes]
49 | long long notrace __muldi3(long long u, long long v)
| ^~~~~~~~
CC lib/ucmpdi2.o
lib/ucmpdi2.c:8:19: warning: no previous prototype for '__ucmpdi2' [-Wmissing-prototypes]
8 | word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b)
| ^~~~~~~~~

Fix this by adding forward declarations to the common libgcc header
file.

Link: https://lkml.kernel.org/r/5cdbe08296693dd53849f199c3933e16e97b33c1.1682088593.git.geert+renesas@glider.be
Signed-off-by: Geert Uytterhoeven <[email protected]>
Reported-by: kernel test robot <[email protected]>
Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Acked-by: Arnd Bergmann <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: Max Filippov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 120

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 120

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version this program is distributed in the
hope that it will be useful but without any warranty without even
the implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more details you
should have received a copy of the gnu general public license along
with this program if not see the file copying or write to the free
software foundation inc

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 12 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Richard Fontana <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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move libgcc.h to include/linux

Introducing a new include/lib directory just for this file totally
messes up tab completion for include/linux, which is highly annoying.

Move it to include/linux wher

move libgcc.h to include/linux

Introducing a new include/lib directory just for this file totally
messes up tab completion for include/linux, which is highly annoying.

Move it to include/linux where we have headers for all kinds of other
lib/ code as well.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

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