Changes in Makefile

5f2fb52f - kbuild: rename hostprogs-y/always to hostprogs/always-y

Sat, 01 Feb 2020 16:49:24 +0000

kbuild: rename hostprogs-y/always to hostprogs/always-yIn old days, the "host-progs" syntax was used for specifying hostprograms. It was renamed to the current "hostprogs-y" in 2004.It is typically useful in scripts/Makefile because it allows Kbuild toselectively compile host programs based on the kernel configuration.This commit renames like follows: always -> always-y hostprogs-y -> hostprogsSo, scripts/Makefile will look like this: always-$(CONFIG_BUILD_BIN2C) += ... always-$(CONFIG_KALLSYMS) += ... ... hostprogs := $(always-y) $(always-m)I think this makes more sense because a host program is always a hostprogram, irrespective of the kernel configuration. We want to specifywhich ones to compile by CONFIG options, so always-y will be handier.The "always", "hostprogs-y", "hostprogs-m" will be kept for backwardcompatibility for a while.Signed-off-by: Masahiro Yamada List of files: /linux-6.15/arch/mips/tools/Makefile

e4acfbc1 - MIPS: Check Loongson3 LL/SC errata workaround correctness

Tue, 01 Oct 2019 21:53:44 +0000

MIPS: Check Loongson3 LL/SC errata workaround correctnessWhen Loongson3 LL/SC errata workarounds are enabled (ie.CONFIG_CPU_LOONGSON3_WORKAROUNDS=y) run a tool to scan through thecompiled kernel & ensure that the workaround is applied correctly. Thatis, ensure that: - Every LL or LLD instruction is preceded by a sync instruction. - Any branches from within an LL/SC loop to outside of that loop target a sync instruction.Reasoning for these conditions can be found by reading the comment abovethe definition of __SYNC_loongson3_war in arch/mips/include/asm/sync.h.This tool will help ensure that we don't inadvertently introduce codepaths that miss the required workarounds.Signed-off-by: Paul Burton Cc: linux-mips@vger.kernel.orgCc: Huacai Chen Cc: Jiaxun Yang Cc: linux-kernel@vger.kernel.org List of files: /linux-6.15/arch/mips/tools/Makefile

e245767a - MIPS: Use a custom elf-entry program to find kernel entry point

Wed, 29 Aug 2018 18:01:30 +0000

MIPS: Use a custom elf-entry program to find kernel entry pointFor a long time arch/mips/Makefile used nm to discover the kernel entrypoint by looking for the address of the kernel_entry symbol. Thisdoesn't work for systems which make use of bit 0 of the PC to reflectthe ISA mode - ie. microMIPS (and MIPS16, but we don't support buildingkernels that target MIPS16 anyway).So for a while with commit 5fc9484f5e41 ("MIPS: Set ISA bit in entry-yfor microMIPS kernels") we manually modified the last nibble of theoutput from nm, which worked but wasn't particularly pretty.Commit 27c524d17430 ("MIPS: Use the entry point from the ELF fileheader") then cleaned this up by using objdump to print the ELF entrypoint which includes the ISA bit, rather than using nm to print theaddress of the kernel_entry symbol which doesn't. That removed the uglyreplacement of the last nibble, but added its own ugliness by needing tomanually sign extend in the 32 bit case.Unfortunately it has been pointed out that objdump's output islocalised, and therefore grepping for its "start address" output doesn'twork when the user's language settings are such that objdump doesn'tprint in English.We could simply revert commit 27c524d17430 ("MIPS: Use the entry pointfrom the ELF file header") and return to the manual replacement of thelast nibble of entry-y, but it seems that was found sufficientlyunpalatable to avoid. We could attempt to force the language used byobjdump by setting an environment variable such as LC_ALL, but thatseems fragile. Instead we add a small tool named elf-entry which simplyprints out the entry point of the kernel in the format we require.Signed-off-by: Paul Burton Reported-by: Philippe Reynes Tested-by: Philippe Reynes Fixes: 27c524d17430 ("MIPS: Use the entry point from the ELF file header")Patchwork: https://patchwork.linux-mips.org/patch/20322/Cc: James Hogan Cc: Ralf Baechle Cc: linux-mips@linux-mips.org List of files: /linux-6.15/arch/mips/tools/Makefile