From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- scripts/Makefile.modfinal | 74 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 scripts/Makefile.modfinal (limited to 'scripts/Makefile.modfinal') diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal new file mode 100644 index 000000000..01a37ec87 --- /dev/null +++ b/scripts/Makefile.modfinal @@ -0,0 +1,74 @@ +# SPDX-License-Identifier: GPL-2.0-only +# =========================================================================== +# Module final link +# =========================================================================== + +PHONY := __modfinal +__modfinal: + +include $(objtree)/include/config/auto.conf +include $(srctree)/scripts/Kbuild.include +include $(srctree)/scripts/Makefile.lib + +# find all modules listed in modules.order +modules := $(call read-file, modules.order) + +__modfinal: $(modules:%.o=%.ko) + @: + +# modname and part-of-module are set to make c_flags define proper module flags +modname = $(notdir $(@:.mod.o=)) +part-of-module = y +GCOV_PROFILE := n +ccflags-remove-y := $(CC_FLAGS_CFI) + +%.mod.o: %.mod.c FORCE + $(call if_changed_rule,cc_o_c) + +.module-common.o: $(srctree)/scripts/module-common.c FORCE + $(call if_changed_rule,cc_o_c) + +ifneq ($(WARN_ON_UNUSED_TRACEPOINTS),) +cmd_check_tracepoint = $(objtree)/scripts/tracepoint-update --module $<; +endif + +quiet_cmd_ld_ko_o = LD [M] $@ + cmd_ld_ko_o = \ + $(LD) -r $(KBUILD_LDFLAGS) \ + $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ + -T $(objtree)/scripts/module.lds -o $@ $(filter %.o, $^) + +quiet_cmd_btf_ko = BTF [M] $@ + cmd_btf_ko = \ + if [ ! -f $(objtree)/vmlinux ]; then \ + printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \ + else \ + $(CONFIG_SHELL) $(srctree)/scripts/gen-btf.sh --btf_base $(objtree)/vmlinux $@; \ + fi; + +# Re-generate module BTFs if either module's .ko or vmlinux changed +%.ko: %.o %.mod.o .module-common.o $(objtree)/scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),$(objtree)/vmlinux) FORCE + +$(call if_changed,ld_ko_o) +ifdef CONFIG_DEBUG_INFO_BTF_MODULES + +$(if $(newer-prereqs),$(call cmd,btf_ko)) +endif + +$(call cmd,check_tracepoint) + +targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) .module-common.o + +# Add FORCE to the prerequisites of a target to force it to be always rebuilt. +# --------------------------------------------------------------------------- + +PHONY += FORCE +FORCE: + +# Read all saved command lines and dependencies for the $(targets) we +# may be building above, using $(if_changed{,_dep}). As an +# optimization, we don't need to read them if the target does not +# exist, we will rebuild anyway in that case. + +existing-targets := $(wildcard $(sort $(targets))) + +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) + +.PHONY: $(PHONY) -- cgit v1.3.1