linux-5.14.2.tar.gz我刚刚编译时出现以下错误patch-5.14.2-rt21.patch
on CONFIG_DEBUG_INFO_BTF=y:
AS arch/x86/lib/iomap_copy_64.o
arch/x86/lib/iomap_copy_64.S: Assembler messages:
arch/x86/lib/iomap_copy_64.S:13: 警告：found `movsd'; assuming `movsl' was meant
AR arch/x86/lib/built-in.a
GEN .version
CHK include/generated/compile.h
LD vmlinux.o
ld: warning: arch/x86/power/hibernate_asm_64.o: missing .note.GNU-stack section implies executable stack
ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
MODPOST vmlinux.symvers
MODINFO modules.builtin.modinfo
GEN modules.builtin
LD .tmp_vmlinux.btf
ld: warning: arch/x86/power/hibernate_asm_64.o: missing .note.GNU-stack section implies executable stack
ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
ld: warning: .tmp_vmlinux.btf has a LOAD segment with RWX permissions
BTF .btf.vmlinux.bin.o
LD .tmp_vmlinux.kallsyms1
ld: warning: .btf.vmlinux.bin.o: missing .note.GNU-stack section implies executable stack
ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions
KSYMS .tmp_vmlinux.kallsyms1.S
AS .tmp_vmlinux.kallsyms1.S
LD .tmp_vmlinux.kallsyms2
ld: warning: .btf.vmlinux.bin.o: missing .note.GNU-stack section implies executable stack
ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
ld: warning: .tmp_vmlinux.kallsyms2 has a LOAD segment with RWX permissions
KSYMS .tmp_vmlinux.kallsyms2.S
AS .tmp_vmlinux.kallsyms2.S
LD vmlinux
ld: warning: .btf.vmlinux.bin.o: missing .note.GNU-stack section implies executable stack
ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
ld: warning: vmlinux has a LOAD segment with RWX permissions
BTFIDS vmlinux
failed: load btf from vmlinux: invalid argument make:
make: *** [Makefile:1176: vmlinux] Error 255
make: *** Deleting file 'vmlinux'
我知道如果CONFIG_DEBUG_INFO_BTF设置为n，编译不会报错，但我不想CONFIG_DEBUG_INFO_BTF设置为n。
从这个问题，看来是虚拟内存太小了，不过这个问题的始作俑者是使用了虚拟机，而我是物理机Debian12。我应该怎么办？
~/kernel/5.14.2/linux-5.14.2$ free -h
total used free shared buff/cache available
内存： 7.7Gi 508Mi 3.4Gi 1.2Mi 4.1Gi 7.2Gi
交换： 976Mi 0B 976Mi
答案1
这可能是因为您正在使用pahole1.24 或更高版本以及“较旧”的内核版本。看https://lore.kernel.org/bpf/Ywkq61Lhyf11SsSa@krava/T/#m008baf5c6d4f252dc74cefcd4105295cf08bfd52
简而言之，pahole您系统上的较新版本使用 生成了 BTF 信息BTF_KIND_ENUM64，但libbpf那些旧内核版本中使用的 不支持此 BTF 类型。
您可以尝试降级pahole到版本 1.23 或查找pahole构建中调用的位置并将--skip_encoding_btf_enum64标志传递给它。
对于将来遇到类似错误的任何人，请注意：pr_debug该工具的调用中会报告有用的信息resolve_btfids，如果您提高日志级别以便实际打印它们，将有助于确定问题所在。
如果您想通过从源代码构建来降级，则存储库位于此处：https://git.kernel.org/pub/scm/devel/pahole/pahole.git/
答案2
我通过更改内核版本解决了这个问题。
linux-6.4.tar.gz和补丁-6.4.6-rt8.补丁。