ea3752ba96
Contemporary kernels and modules can be relatively large, especially when common debug options are enabled. Using GCC 12.1.0, a v6.3-rc7 defconfig kernel is ~38M, and with PROVE_LOCKING + KASAN_INLINE enabled this expands to ~117M. Shanker reports [1] that the NVIDIA GPU driver alone can consume 110M of module space in some configurations. Both KASLR and ARM64_ERRATUM_843419 select MODULE_PLTS, so anyone wanting a kernel to have KASLR or run on Cortex-A53 will have MODULE_PLTS selected. This is the case in defconfig and distribution kernels (e.g. Debian, Android, etc). Practically speaking, this means we're very likely to need MODULE_PLTS and while it's almost guaranteed that MODULE_PLTS will be selected, it is possible to disable support, and we have to maintain some awkward special cases for such unusual configurations. This patch removes the MODULE_PLTS config option, with the support code always enabled if MODULES is selected. This results in a slight simplification, and will allow for further improvement in subsequent patches. For any config which currently selects MODULE_PLTS, there will be no functional change as a result of this patch. [1] https://lore.kernel.org/linux-arm-kernel/159ceeab-09af-3174-5058-445bc8dcf85b@nvidia.com/ Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Cc: Shanker Donthineni <sdonthineni@nvidia.com> Cc: Will Deacon <will@kernel.org> Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> Link: https://lore.kernel.org/r/20230530110328.2213762-6-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
91 lines
3.4 KiB
Makefile
91 lines
3.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Makefile for the linux kernel.
|
|
#
|
|
|
|
CFLAGS_armv8_deprecated.o := -I$(src)
|
|
|
|
CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_REMOVE_insn.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_REMOVE_return_address.o = $(CC_FLAGS_FTRACE)
|
|
|
|
# Remove stack protector to avoid triggering unneeded stack canary
|
|
# checks due to randomize_kstack_offset.
|
|
CFLAGS_REMOVE_syscall.o = -fstack-protector -fstack-protector-strong
|
|
CFLAGS_syscall.o += -fno-stack-protector
|
|
|
|
# When KASAN is enabled, a stack trace is recorded for every alloc/free, which
|
|
# can significantly impact performance. Avoid instrumenting the stack trace
|
|
# collection code to minimize this impact.
|
|
KASAN_SANITIZE_stacktrace.o := n
|
|
|
|
# It's not safe to invoke KCOV when portions of the kernel environment aren't
|
|
# available or are out-of-sync with HW state. Since `noinstr` doesn't always
|
|
# inhibit KCOV instrumentation, disable it for the entire compilation unit.
|
|
KCOV_INSTRUMENT_entry-common.o := n
|
|
KCOV_INSTRUMENT_idle.o := n
|
|
|
|
# Object file lists.
|
|
obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
|
|
entry-common.o entry-fpsimd.o process.o ptrace.o \
|
|
setup.o signal.o sys.o stacktrace.o time.o traps.o \
|
|
io.o vdso.o hyp-stub.o psci.o cpu_ops.o \
|
|
return_address.o cpuinfo.o cpu_errata.o \
|
|
cpufeature.o alternative.o cacheinfo.o \
|
|
smp.o smp_spin_table.o topology.o smccc-call.o \
|
|
syscall.o proton-pack.o idreg-override.o idle.o \
|
|
patching.o
|
|
|
|
obj-$(CONFIG_COMPAT) += sys32.o signal32.o \
|
|
sys_compat.o
|
|
obj-$(CONFIG_COMPAT) += sigreturn32.o
|
|
obj-$(CONFIG_COMPAT_ALIGNMENT_FIXUPS) += compat_alignment.o
|
|
obj-$(CONFIG_KUSER_HELPERS) += kuser32.o
|
|
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
|
|
obj-$(CONFIG_MODULES) += module.o module-plts.o
|
|
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o
|
|
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
|
|
obj-$(CONFIG_CPU_PM) += sleep.o suspend.o
|
|
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
|
|
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
|
|
obj-$(CONFIG_KGDB) += kgdb.o
|
|
obj-$(CONFIG_EFI) += efi.o efi-rt-wrapper.o
|
|
obj-$(CONFIG_PCI) += pci.o
|
|
obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
|
|
obj-$(CONFIG_ACPI) += acpi.o
|
|
obj-$(CONFIG_ACPI_NUMA) += acpi_numa.o
|
|
obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL) += acpi_parking_protocol.o
|
|
obj-$(CONFIG_PARAVIRT) += paravirt.o
|
|
obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o pi/
|
|
obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o
|
|
obj-$(CONFIG_ELF_CORE) += elfcore.o
|
|
obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o \
|
|
cpu-reset.o
|
|
obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o
|
|
obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o
|
|
arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
|
|
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
|
|
obj-$(CONFIG_CRASH_CORE) += crash_core.o
|
|
obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o
|
|
obj-$(CONFIG_ARM64_PTR_AUTH) += pointer_auth.o
|
|
obj-$(CONFIG_ARM64_MTE) += mte.o
|
|
obj-y += vdso-wrap.o
|
|
obj-$(CONFIG_COMPAT_VDSO) += vdso32-wrap.o
|
|
obj-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) += patch-scs.o
|
|
CFLAGS_patch-scs.o += -mbranch-protection=none
|
|
|
|
# Force dependency (vdso*-wrap.S includes vdso.so through incbin)
|
|
$(obj)/vdso-wrap.o: $(obj)/vdso/vdso.so
|
|
$(obj)/vdso32-wrap.o: $(obj)/vdso32/vdso.so
|
|
|
|
obj-y += probes/
|
|
obj-y += head.o
|
|
extra-y += vmlinux.lds
|
|
|
|
ifeq ($(CONFIG_DEBUG_EFI),y)
|
|
AFLAGS_head.o += -DVMLINUX_PATH="\"$(realpath $(objtree)/vmlinux)\""
|
|
endif
|
|
|
|
# for cleaning
|
|
subdir- += vdso vdso32
|