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arm64 descends into each vdso directory twice; first in vdso_prepare, second during the ordinary build process. PPC mimicked it and uncovered a problem [1]. In the first descend, Kbuild directly visits the vdso directories, therefore it does not inherit subdir-ccflags-y from upper directories. This means the command line parameters may differ between the two. If it happens, the offset values in the generated headers might be different from real offsets of vdso.so in the kernel. This potential danger should be avoided. The vdso directories are built in the vdso_prepare stage, so the second descend is unneeded. [1]: https://lore.kernel.org/linux-kbuild/CAK7LNARAkJ3_-4gX0VA2UkapbOftuzfSTVMBbgbw=HD8n7N+7w@mail.gmail.com/T/#ma10dcb961fda13f36d42d58fa6cb2da988b7e73a Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Link: https://lore.kernel.org/r/20201218024540.1102650-1-masahiroy@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
20 lines
351 B
ArmAsm
20 lines
351 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 ARM Limited
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/const.h>
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#include <asm/page.h>
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.globl vdso32_start, vdso32_end
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.section .rodata
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.balign PAGE_SIZE
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vdso32_start:
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.incbin "arch/arm64/kernel/vdso32/vdso.so"
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.balign PAGE_SIZE
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vdso32_end:
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.previous
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