kernel/linux.git/arch/mips/Makefile, branch v6.19.11

kbuild: Introduce Kconfig symbol for linking vmlinux with relocations

2025-03-16T15:29:50+00:00

Some architectures build vmlinux with static relocations preserved, but strip them again from the final vmlinux image. Arch specific tools consume these static relocations in order to construct relocation tables for KASLR. The fact that vmlinux is created, consumed and subsequently updated goes against the typical, declarative paradigm used by Make, which is based on rules and dependencies. So as a first step towards cleaning this up, introduce a Kconfig symbol to declare that the arch wants to consume the static relocations emitted into vmlinux. This will be wired up further in subsequent patches. Signed-off-by: Ard Biesheuvel Signed-off-by: Masahiro Yamada

MIPS: migrate to generic rule for built-in DTBs

2025-01-11T12:53:42+00:00

Commit 654102df2ac2 ("kbuild: add generic support for built-in boot DTBs") introduced generic support for built-in DTBs. Select GENERIC_BUILTIN_DTB and BUILTIN_DTB_ALL when the built-in DTB support is enabled. DTBs compiled under arch/mips/boot/dts/ will be wrapped by the generic rule in scripts/Makefile.vmlinux. Signed-off-by: Masahiro Yamada Signed-off-by: Thomas Bogendoerfer

MIPS: Fix fallback march for SB1

2024-07-15T16:16:23+00:00

Fallback march for SB1 should be mips64 instead of mips64r1. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202407111851.LwDasTcp-lkp@intel.com/ Fixes: bfc0a330c1b4 ("MIPS: Fallback CPU -march flag to ISA level if unsupported") Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson64: test for -march=loongson3a cflag

2024-02-23T09:13:47+00:00

Currently march flag is hardcoded to loongson3a for GCC and mips64r2 for clang. We can actually test it to simplify the code. Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: BMIPS: Drop unnecessary assembler flag

2024-02-23T09:13:47+00:00

Nowadays GCC will always pass -march flag to gas, so there is no need to pass another mips32 flag to assembler. Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Fallback CPU -march flag to ISA level if unsupported

2024-02-23T09:13:47+00:00

LLVM does not implement some of -march options. However those options are not mandatory for kernel to build for those CPUs. Fallback -march CFLAG to ISA level if unsupported by toolchain so we can get those kernel to build with LLVM. Link: https://github.com/ClangBuiltLinux/linux/issues/1544 Reported-by: Nathan Chancellor Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Remove cc-option checks for -march=octeon

2024-02-23T09:13:47+00:00

Nowadays our minimal supported GCC/Clang all support -march=octeon. Remove cc-option checks to simplify code. Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Probe toolchain support of -msym32

2024-02-23T09:13:47+00:00

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

Revert MIPS: Loongson: Fix build error when make modules_install

2023-07-25T08:42:01+00:00

Revert commit 531b3d1195d0 ("MIPS: Loongson: Fix build error when make modules_install"), which made `-march=loongson2e', `-march=loongson2f', and `-march=loongson3a' compilation options probed for even though GCC has supported them since 4.4.0, 4.4.0, and 4.6.0 respectively, which is below our current minimum requirement of 5.1, in an attempt to work around for the `cc-option' `make' function being undefined with `make' targets that do not use the compiler. The workaround has now been made obsolete, by querying the `need-compiler' variable instead so as to make sure the compiler isn't called for non-build targets. Verified with `fuloong2e_defconfig' and the `modules_install' target. Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer

MIPS: Only fiddle with CHECKFLAGS if `need-compiler'

2023-07-25T08:42:01+00:00

We have originally guarded fiddling with CHECKFLAGS in our arch Makefile by checking for the CONFIG_MIPS variable, not set for targets such as `distclean', etc. that neither include `.config' nor use the compiler. Starting from commit 805b2e1d427a ("kbuild: include Makefile.compiler only when compiler is needed") we have had a generic `need-compiler' variable explicitly telling us if the compiler will be used and thus its capabilities need to be checked and expressed in the form of compilation flags. If this variable is not set, then `make' functions such as `cc-option' are undefined, causing all kinds of weirdness to happen if we expect specific results to be returned, most recently: cc1: error: '-mloongson-mmi' must be used with '-mhard-float' messages with configurations such as `fuloong2e_defconfig' and the `modules_install' target, which does include `.config' and yet does not use the compiler. Replace the check for CONFIG_MIPS with one for `need-compiler' instead, so as to prevent the compiler from being ever called for CHECKFLAGS when not needed. Reported-by: Guillaume Tucker Closes: https://lore.kernel.org/r/85031c0c-d981-031e-8a50-bc4fad2ddcd8@collabora.com/ Signed-off-by: Maciej W. Rozycki Fixes: 805b2e1d427a ("kbuild: include Makefile.compiler only when compiler is needed") Cc: stable@vger.kernel.org # v5.13+ Reported-by: "kernelci.org bot" Signed-off-by: Thomas Bogendoerfer