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782f46cbce
Function tracer on powerpc can only work with vmlinux having a .text size of up to ~64MB due to powerpc branch instruction having a limited relative branch range of 32MB. Today, this is only detected on kernel boot when ftrace is init'ed. Add a post-link script to check the size of .text so that we can detect this at build time, and break the build if necessary. We add a dependency on !COMPILE_TEST for CONFIG_HAVE_FUNCTION_TRACER so that allyesconfig and other test builds can continue to work without enabling ftrace. Signed-off-by: Naveen N Rao <naveen@kernel.org> Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://patch.msgid.link/20241030070850.1361304-11-hbathini@linux.ibm.com
54 lines
1.4 KiB
Makefile
54 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ===========================================================================
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# Post-link powerpc pass
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# ===========================================================================
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#
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# 1. Check that vmlinux relocations look sane
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PHONY := __archpost
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__archpost:
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-include include/config/auto.conf
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include $(srctree)/scripts/Kbuild.include
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quiet_cmd_head_check = CHKHEAD $@
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cmd_head_check = $(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/head_check.sh "$(NM)" "$@"
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quiet_cmd_relocs_check = CHKREL $@
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ifdef CONFIG_PPC_BOOK3S_64
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cmd_relocs_check = \
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$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$(NM)" "$@" ; \
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$(BASH) $(srctree)/arch/powerpc/tools/unrel_branch_check.sh "$(OBJDUMP)" "$(NM)" "$@"
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else
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cmd_relocs_check = \
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$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$(NM)" "$@"
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endif
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quiet_cmd_ftrace_check = CHKFTRC $@
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cmd_ftrace_check = $(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/ftrace_check.sh "$(NM)" "$@"
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# `@true` prevents complaint when there is nothing to be done
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vmlinux: FORCE
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@true
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ifdef CONFIG_PPC64
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$(call cmd,head_check)
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endif
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ifdef CONFIG_RELOCATABLE
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$(call if_changed,relocs_check)
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endif
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ifdef CONFIG_FUNCTION_TRACER
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ifndef CONFIG_PPC64_ELF_ABI_V1
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$(call cmd,ftrace_check)
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endif
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endif
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clean:
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rm -f .tmp_symbols.txt
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PHONY += FORCE clean
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FORCE:
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.PHONY: $(PHONY)
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