linux-stable.git/arch/mips/Makefile, branch linux-5.4.y

mips: Include KBUILD_CPPFLAGS in CHECKFLAGS invocation

2025-08-28T14:21:33+00:00

commit 08f6554ff90ef189e6b8f0303e57005bddfdd6a7 upstream.

A future change will move CLANG_FLAGS from KBUILD_{A,C}FLAGS to
KBUILD_CPPFLAGS so that '--target' is available while preprocessing.
When that occurs, the following error appears when building ARCH=mips
with clang (tip of tree error shown):

  clang: error: unsupported option '-mabi=' for target 'x86_64-pc-linux-gnu'

Add KBUILD_CPPFLAGS in the CHECKFLAGS invocation to keep everything
working after the move.

Signed-off-by: Nathan Chancellor 
Signed-off-by: Masahiro Yamada 
Signed-off-by: Nathan Chancellor 
Signed-off-by: Greg Kroah-Hartman

MIPS: Move '-Wa,-msoft-float' check from as-option to cc-option

2025-06-27T10:02:50+00:00

This patch is for linux-6.1.y and earlier, it has no direct mainline
equivalent.

In order to backport commit d5c8d6e0fa61 ("kbuild: Update assembler
calls to use proper flags and language target") to resolve a separate
issue regarding PowerPC, the problem noticed and fixed by
commit 80a20d2f8288 ("MIPS: Always use -Wa,-msoft-float and eliminate
GAS_HAS_SET_HARDFLOAT") needs to be addressed. Unfortunately, 6.1 and
earlier do not contain commit e4412739472b ("Documentation: raise
minimum supported version of binutils to 2.25"), so it cannot be assumed
that all supported versions of GNU as have support for -msoft-float.

In order to switch from KBUILD_CFLAGS to KBUILD_AFLAGS in as-option
without consequence, move the '-Wa,-msoft-float' check to cc-option,
including '$(cflags-y)' directly to avoid the issue mentioned in
commit 80a20d2f8288 ("MIPS: Always use -Wa,-msoft-float and eliminate
GAS_HAS_SET_HARDFLOAT").

Signed-off-by: Nathan Chancellor 
Signed-off-by: Greg Kroah-Hartman

MIPS: Probe toolchain support of -msym32

2025-01-09T12:23:32+00:00

[ Upstream commit 18ca63a2e23c5e170d2d7552b64b1f5ad019cd9b ]

msym32 is not supported by LLVM toolchain.
Workaround by probe toolchain support of msym32 for KBUILD_SYM32
feature.

Link: https://github.com/ClangBuiltLinux/linux/issues/1544
Signed-off-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: WangYuli 
Signed-off-by: Sasha Levin

mips: Fix non-POSIX regexp

2021-08-12T11:20:57+00:00

[ Upstream commit 28bbbb9875a35975904e46f9b06fa689d051b290 ]

When cross compiling a MIPS kernel on a BSD based HOSTCC leads
to errors like

  SYNC    include/config/auto.conf.cmd - due to: .config
egrep: empty (sub)expression
  UPD     include/config/kernel.release
  HOSTCC  scripts/dtc/dtc.o - due to target missing

It turns out that egrep uses this egrep pattern:

		(|MINOR_|PATCHLEVEL_)

This is not valid syntax or gives undefined results according
to POSIX 9.5.3 ERE Grammar

	https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html

It seems to be silently accepted by the Linux egrep implementation
while a BSD host complains.

Such patterns can be replaced by a transformation like

	"(|p1|p2)" -> "(p1|p2)?"

Fixes: 48c35b2d245f ("[MIPS] There is no __GNUC_MAJOR__")
Signed-off-by: H. Nikolaus Schaller 
Signed-off-by: Masahiro Yamada 
Signed-off-by: Sasha Levin

MIPS: Truncate link address into 32bit for 32bit kernel

2020-06-22T07:31:03+00:00

[ Upstream commit ff487d41036035376e47972c7c522490b839ab37 ]

LLD failed to link vmlinux with 64bit load address for 32bit ELF
while bfd will strip 64bit address into 32bit silently.
To fix LLD build, we should truncate load address provided by platform
into 32bit for 32bit kernel.

Signed-off-by: Jiaxun Yang 
Link: https://github.com/ClangBuiltLinux/linux/issues/786
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=25784
Reviewed-by: Fangrui Song 
Reviewed-by: Kees Cook 
Tested-by: Nathan Chancellor 
Cc: Maciej W. Rozycki 
Tested-by: Nick Desaulniers 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Sasha Levin

MIPS: Remove unused R8000 CPU support

2019-07-23T21:33:51+00:00

Our R8000 CPU support can only be included if a system selects
CONFIG_SYS_HAS_CPU_R8000. No system does, making all R8000-related CPU
support dead code. Remove it.

Signed-off-by: Paul Burton 
Cc: linux-mips@vger.kernel.org

MIPS: Remove unused R5432 CPU support

2019-07-23T21:33:34+00:00

Our R5432 CPU support can only be included if a system selects
CONFIG_SYS_HAS_CPU_R5432. No system does, making all R5432-related CPU
support dead code. Remove it.

Signed-off-by: Paul Burton 
Cc: linux-mips@vger.kernel.org

MIPS: Remove unused R4300 CPU support

2019-07-23T21:33:23+00:00

Our R4300 CPU support can only be included if a system selects
CONFIG_SYS_HAS_CPU_R4300. No system does, making all R4300-related CPU
support dead code. Remove it.

Signed-off-by: Paul Burton 
Cc: linux-mips@vger.kernel.org

MIPS: have "plain" make calls build dtbs for selected platforms

2019-06-20T21:52:56+00:00

scripts/package/builddeb calls "make dtbs_install" after executing
a plain make (i.e. no build targets specified). It will fail if dtbs
were not built beforehand. Match the arm64 architecture where DTBs get
built by the "all" target.

Signed-off-by: Cedric Hombourger 
[paul.burton@mips.com: s/builddep/builddeb]
Signed-off-by: Paul Burton 
Cc: linux-mips@vger.kernel.org
Cc: stable@vger.kernel.org # v4.1+

MIPS: Add GINVT instruction helpers

2019-02-04T18:56:35+00:00

Add a family of ginvt_* functions making it easy to emit a GINVT
instruction to globally invalidate TLB entries. We make use of the
_ASM_MACRO infrastructure to support emitting the instructions even if
the assembler isn't new enough to support them natively.

An associated STYPE_GINV definition & sync_ginv() function are added to
emit a sync instruction of type 0x14, which operates as a completion
barrier for these new GINVT (and GINVI) instructions.

Signed-off-by: Paul Burton 
Cc: linux-mips@vger.kernel.org