Am Montag, 2. März 2026, 23:53:16 CEST schrieb Mark Brown: > Currently for each hwcap we define both the HWCAPn_NAME definition which is > exposed to userspace and a kernel internal KERNEL_HWCAP_NAME definition > which we use internally. This is tedious and repetitive, instead use a > script to generate the KERNEL_HWCAP_ definitions from the UAPI definitions. > > No functional changes intended.
Somehow this change causes to delete and generate kernel-hwcap.h on each make call. This results in compiling essentially everything each time. $ make Image make[1]: Entering directory '/linux/build_arm64' REMOVE arch/arm64/include/generated/asm/kernel-hwcap.h GEN arch/arm64/include/generated/asm/kernel-hwcap.h CC arch/arm64/kernel/asm-offsets.s CC kernel/sched/rq-offsets.s ^Cmake[3]: *** Deleting file 'kernel/sched/rq-offsets.s' make[3]: *** [../scripts/Makefile.build:184: kernel/sched/rq-offsets.s] Interrupt make[2]: *** [/linux/Makefile:1371: prepare0] Interrupt make[1]: *** [/linux/Makefile:248: __sub-make] Interrupt make: *** [Makefile:248: __sub-make] Interrupt make Image make[1]: Entering directory '/linux/build_arm64' REMOVE arch/arm64/include/generated/asm/kernel-hwcap.h GEN arch/arm64/include/generated/asm/kernel-hwcap.h CC arch/arm64/kernel/asm-offsets.s CC kernel/sched/rq-offsets.s CC arch/arm64/kernel/vdso/vgettimeofday.o LD arch/arm64/kernel/vdso/vdso.so.dbg VDSOSYM include/generated/vdso-offsets.h OBJCOPY arch/arm64/kernel/vdso/vdso.so CC init/version.o ^Cmake[4]: *** [../scripts/Makefile.build:289: init/version.o] Interrupt make[3]: *** [../scripts/Makefile.build:548: init] Interrupt make[2]: *** [/linux/Makefile:2140: .] Interrupt make[1]: *** [/linux/Makefile:248: __sub-make] Interrupt make: *** [Makefile:248: __sub-make] Interrupt Best regards, Alexander > > Signed-off-by: Mark Brown <[email protected]> > --- > arch/arm64/include/asm/hwcap.h | 120 > +--------------------------------- > arch/arm64/tools/Makefile | 8 ++- > arch/arm64/tools/gen-kernel-hwcaps.sh | 23 +++++++ > 3 files changed, 32 insertions(+), 119 deletions(-) > > diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h > index 72ea4bda79f3..abe8218b2325 100644 > --- a/arch/arm64/include/asm/hwcap.h > +++ b/arch/arm64/include/asm/hwcap.h > @@ -60,126 +60,10 @@ > * of KERNEL_HWCAP_{feature}. > */ > #define __khwcap_feature(x) const_ilog2(HWCAP_ ## x) > -#define KERNEL_HWCAP_FP __khwcap_feature(FP) > -#define KERNEL_HWCAP_ASIMD __khwcap_feature(ASIMD) > -#define KERNEL_HWCAP_EVTSTRM __khwcap_feature(EVTSTRM) > -#define KERNEL_HWCAP_AES __khwcap_feature(AES) > -#define KERNEL_HWCAP_PMULL __khwcap_feature(PMULL) > -#define KERNEL_HWCAP_SHA1 __khwcap_feature(SHA1) > -#define KERNEL_HWCAP_SHA2 __khwcap_feature(SHA2) > -#define KERNEL_HWCAP_CRC32 __khwcap_feature(CRC32) > -#define KERNEL_HWCAP_ATOMICS __khwcap_feature(ATOMICS) > -#define KERNEL_HWCAP_FPHP __khwcap_feature(FPHP) > -#define KERNEL_HWCAP_ASIMDHP __khwcap_feature(ASIMDHP) > -#define KERNEL_HWCAP_CPUID __khwcap_feature(CPUID) > -#define KERNEL_HWCAP_ASIMDRDM __khwcap_feature(ASIMDRDM) > -#define KERNEL_HWCAP_JSCVT __khwcap_feature(JSCVT) > -#define KERNEL_HWCAP_FCMA __khwcap_feature(FCMA) > -#define KERNEL_HWCAP_LRCPC __khwcap_feature(LRCPC) > -#define KERNEL_HWCAP_DCPOP __khwcap_feature(DCPOP) > -#define KERNEL_HWCAP_SHA3 __khwcap_feature(SHA3) > -#define KERNEL_HWCAP_SM3 __khwcap_feature(SM3) > -#define KERNEL_HWCAP_SM4 __khwcap_feature(SM4) > -#define KERNEL_HWCAP_ASIMDDP __khwcap_feature(ASIMDDP) > -#define KERNEL_HWCAP_SHA512 __khwcap_feature(SHA512) > -#define KERNEL_HWCAP_SVE __khwcap_feature(SVE) > -#define KERNEL_HWCAP_ASIMDFHM __khwcap_feature(ASIMDFHM) > -#define KERNEL_HWCAP_DIT __khwcap_feature(DIT) > -#define KERNEL_HWCAP_USCAT __khwcap_feature(USCAT) > -#define KERNEL_HWCAP_ILRCPC __khwcap_feature(ILRCPC) > -#define KERNEL_HWCAP_FLAGM __khwcap_feature(FLAGM) > -#define KERNEL_HWCAP_SSBS __khwcap_feature(SSBS) > -#define KERNEL_HWCAP_SB __khwcap_feature(SB) > -#define KERNEL_HWCAP_PACA __khwcap_feature(PACA) > -#define KERNEL_HWCAP_PACG __khwcap_feature(PACG) > -#define KERNEL_HWCAP_GCS __khwcap_feature(GCS) > -#define KERNEL_HWCAP_CMPBR __khwcap_feature(CMPBR) > -#define KERNEL_HWCAP_FPRCVT __khwcap_feature(FPRCVT) > -#define KERNEL_HWCAP_F8MM8 __khwcap_feature(F8MM8) > -#define KERNEL_HWCAP_F8MM4 __khwcap_feature(F8MM4) > -#define KERNEL_HWCAP_SVE_F16MM __khwcap_feature(SVE_F16MM) > -#define KERNEL_HWCAP_SVE_ELTPERM __khwcap_feature(SVE_ELTPERM) > -#define KERNEL_HWCAP_SVE_AES2 __khwcap_feature(SVE_AES2) > -#define KERNEL_HWCAP_SVE_BFSCALE __khwcap_feature(SVE_BFSCALE) > -#define KERNEL_HWCAP_SVE2P2 __khwcap_feature(SVE2P2) > -#define KERNEL_HWCAP_SME2P2 __khwcap_feature(SME2P2) > -#define KERNEL_HWCAP_SME_SBITPERM __khwcap_feature(SME_SBITPERM) > -#define KERNEL_HWCAP_SME_AES __khwcap_feature(SME_AES) > -#define KERNEL_HWCAP_SME_SFEXPA __khwcap_feature(SME_SFEXPA) > -#define KERNEL_HWCAP_SME_STMOP __khwcap_feature(SME_STMOP) > -#define KERNEL_HWCAP_SME_SMOP4 __khwcap_feature(SME_SMOP4) > - > #define __khwcap2_feature(x) (const_ilog2(HWCAP2_ ## x) + 64) > -#define KERNEL_HWCAP_DCPODP __khwcap2_feature(DCPODP) > -#define KERNEL_HWCAP_SVE2 __khwcap2_feature(SVE2) > -#define KERNEL_HWCAP_SVEAES __khwcap2_feature(SVEAES) > -#define KERNEL_HWCAP_SVEPMULL __khwcap2_feature(SVEPMULL) > -#define KERNEL_HWCAP_SVEBITPERM __khwcap2_feature(SVEBITPERM) > -#define KERNEL_HWCAP_SVESHA3 __khwcap2_feature(SVESHA3) > -#define KERNEL_HWCAP_SVESM4 __khwcap2_feature(SVESM4) > -#define KERNEL_HWCAP_FLAGM2 __khwcap2_feature(FLAGM2) > -#define KERNEL_HWCAP_FRINT __khwcap2_feature(FRINT) > -#define KERNEL_HWCAP_SVEI8MM __khwcap2_feature(SVEI8MM) > -#define KERNEL_HWCAP_SVEF32MM __khwcap2_feature(SVEF32MM) > -#define KERNEL_HWCAP_SVEF64MM __khwcap2_feature(SVEF64MM) > -#define KERNEL_HWCAP_SVEBF16 __khwcap2_feature(SVEBF16) > -#define KERNEL_HWCAP_I8MM __khwcap2_feature(I8MM) > -#define KERNEL_HWCAP_BF16 __khwcap2_feature(BF16) > -#define KERNEL_HWCAP_DGH __khwcap2_feature(DGH) > -#define KERNEL_HWCAP_RNG __khwcap2_feature(RNG) > -#define KERNEL_HWCAP_BTI __khwcap2_feature(BTI) > -#define KERNEL_HWCAP_MTE __khwcap2_feature(MTE) > -#define KERNEL_HWCAP_ECV __khwcap2_feature(ECV) > -#define KERNEL_HWCAP_AFP __khwcap2_feature(AFP) > -#define KERNEL_HWCAP_RPRES __khwcap2_feature(RPRES) > -#define KERNEL_HWCAP_MTE3 __khwcap2_feature(MTE3) > -#define KERNEL_HWCAP_SME __khwcap2_feature(SME) > -#define KERNEL_HWCAP_SME_I16I64 __khwcap2_feature(SME_I16I64) > -#define KERNEL_HWCAP_SME_F64F64 __khwcap2_feature(SME_F64F64) > -#define KERNEL_HWCAP_SME_I8I32 __khwcap2_feature(SME_I8I32) > -#define KERNEL_HWCAP_SME_F16F32 __khwcap2_feature(SME_F16F32) > -#define KERNEL_HWCAP_SME_B16F32 __khwcap2_feature(SME_B16F32) > -#define KERNEL_HWCAP_SME_F32F32 __khwcap2_feature(SME_F32F32) > -#define KERNEL_HWCAP_SME_FA64 __khwcap2_feature(SME_FA64) > -#define KERNEL_HWCAP_WFXT __khwcap2_feature(WFXT) > -#define KERNEL_HWCAP_EBF16 __khwcap2_feature(EBF16) > -#define KERNEL_HWCAP_SVE_EBF16 __khwcap2_feature(SVE_EBF16) > -#define KERNEL_HWCAP_CSSC __khwcap2_feature(CSSC) > -#define KERNEL_HWCAP_RPRFM __khwcap2_feature(RPRFM) > -#define KERNEL_HWCAP_SVE2P1 __khwcap2_feature(SVE2P1) > -#define KERNEL_HWCAP_SME2 __khwcap2_feature(SME2) > -#define KERNEL_HWCAP_SME2P1 __khwcap2_feature(SME2P1) > -#define KERNEL_HWCAP_SME_I16I32 __khwcap2_feature(SME_I16I32) > -#define KERNEL_HWCAP_SME_BI32I32 __khwcap2_feature(SME_BI32I32) > -#define KERNEL_HWCAP_SME_B16B16 __khwcap2_feature(SME_B16B16) > -#define KERNEL_HWCAP_SME_F16F16 __khwcap2_feature(SME_F16F16) > -#define KERNEL_HWCAP_MOPS __khwcap2_feature(MOPS) > -#define KERNEL_HWCAP_HBC __khwcap2_feature(HBC) > -#define KERNEL_HWCAP_SVE_B16B16 __khwcap2_feature(SVE_B16B16) > -#define KERNEL_HWCAP_LRCPC3 __khwcap2_feature(LRCPC3) > -#define KERNEL_HWCAP_LSE128 __khwcap2_feature(LSE128) > -#define KERNEL_HWCAP_FPMR __khwcap2_feature(FPMR) > -#define KERNEL_HWCAP_LUT __khwcap2_feature(LUT) > -#define KERNEL_HWCAP_FAMINMAX __khwcap2_feature(FAMINMAX) > -#define KERNEL_HWCAP_F8CVT __khwcap2_feature(F8CVT) > -#define KERNEL_HWCAP_F8FMA __khwcap2_feature(F8FMA) > -#define KERNEL_HWCAP_F8DP4 __khwcap2_feature(F8DP4) > -#define KERNEL_HWCAP_F8DP2 __khwcap2_feature(F8DP2) > -#define KERNEL_HWCAP_F8E4M3 __khwcap2_feature(F8E4M3) > -#define KERNEL_HWCAP_F8E5M2 __khwcap2_feature(F8E5M2) > -#define KERNEL_HWCAP_SME_LUTV2 __khwcap2_feature(SME_LUTV2) > -#define KERNEL_HWCAP_SME_F8F16 __khwcap2_feature(SME_F8F16) > -#define KERNEL_HWCAP_SME_F8F32 __khwcap2_feature(SME_F8F32) > -#define KERNEL_HWCAP_SME_SF8FMA __khwcap2_feature(SME_SF8FMA) > -#define KERNEL_HWCAP_SME_SF8DP4 __khwcap2_feature(SME_SF8DP4) > -#define KERNEL_HWCAP_SME_SF8DP2 __khwcap2_feature(SME_SF8DP2) > -#define KERNEL_HWCAP_POE __khwcap2_feature(POE) > - > #define __khwcap3_feature(x) (const_ilog2(HWCAP3_ ## x) + 128) > -#define KERNEL_HWCAP_MTE_FAR __khwcap3_feature(MTE_FAR) > -#define KERNEL_HWCAP_MTE_STORE_ONLY __khwcap3_feature(MTE_STORE_ONLY) > -#define KERNEL_HWCAP_LSFE __khwcap3_feature(LSFE) > -#define KERNEL_HWCAP_LS64 __khwcap3_feature(LS64) > + > +#include "asm/kernel-hwcap.h" > > /* > * This yields a mask that user programs can use to figure out what > diff --git a/arch/arm64/tools/Makefile b/arch/arm64/tools/Makefile > index c2b34e761006..a94b3d9caad6 100644 > --- a/arch/arm64/tools/Makefile > +++ b/arch/arm64/tools/Makefile > @@ -3,7 +3,7 @@ > gen := arch/$(ARCH)/include/generated > kapi := $(gen)/asm > > -kapisyshdr-y := cpucap-defs.h sysreg-defs.h > +kapisyshdr-y := cpucap-defs.h kernel-hwcap.h sysreg-defs.h > > kapi-hdrs-y := $(addprefix $(kapi)/, $(kapisyshdr-y)) > > @@ -18,11 +18,17 @@ kapi: $(kapi-hdrs-y) > quiet_cmd_gen_cpucaps = GEN $@ > cmd_gen_cpucaps = mkdir -p $(dir $@); $(AWK) -f $(real-prereqs) > $@ > > +quiet_cmd_gen_kernel_hwcap = GEN $@ > + cmd_gen_kernel_hwcap = mkdir -p $(dir $@); /bin/sh -e $(real-prereqs) > > $@ > + > quiet_cmd_gen_sysreg = GEN $@ > cmd_gen_sysreg = mkdir -p $(dir $@); $(AWK) -f $(real-prereqs) > $@ > > $(kapi)/cpucap-defs.h: $(src)/gen-cpucaps.awk $(src)/cpucaps FORCE > $(call if_changed,gen_cpucaps) > > +$(kapi)/kernel-hwcap.h: $(src)/gen-kernel-hwcaps.sh > $(srctree)/arch/arm64/include/uapi/asm/hwcap.h FORCE > + $(call if_changed,gen_kernel_hwcap) > + > $(kapi)/sysreg-defs.h: $(src)/gen-sysreg.awk $(src)/sysreg FORCE > $(call if_changed,gen_sysreg) > diff --git a/arch/arm64/tools/gen-kernel-hwcaps.sh > b/arch/arm64/tools/gen-kernel-hwcaps.sh > new file mode 100644 > index 000000000000..e7cdcf428d91 > --- /dev/null > +++ b/arch/arm64/tools/gen-kernel-hwcaps.sh > @@ -0,0 +1,23 @@ > +#!/bin/sh -e > +# SPDX-License-Identifier: GPL-2.0 > +# > +# gen-kernel-hwcap.sh - Generate kernel internal hwcap.h definitions > +# > +# Copyright 2026 Arm, Ltd. > + > +if [ "$1" = "" ]; then > + echo "$0: no filename specified" > + exit 1 > +fi > + > +echo "#ifndef __ASM_KERNEL_HWCAPS_H" > +echo "#define __ASM_KERNEL_HWCAPS_H" > +echo "" > +echo "/* Generated file - do not edit */" > +echo "" > + > +grep -E '^#define HWCAP[0-9]*_[A-Z0-9_]+' $1 | \ > + sed 's/.*HWCAP\([0-9]*\)_\([A-Z0-9_]\+\).*/#define > KERNEL_HWCAP_\2\t__khwcap\1_feature(\2)/' > + > +echo "" > +echo "#endif /* __ASM_KERNEL_HWCAPS_H */" > > -- TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany Amtsgericht München, HRB 105018 Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider http://www.tq-group.com/
