From: Brendan Higgins <brendanhiggins@google.com>
To: jdike@addtoit.com, richard@nod.at,
anton.ivanov@cambridgegreys.com, akpm@linux-foundation.org,
changbin.du@intel.com, yamada.masahiro@socionext.com,
rdunlap@infradead.org, keescook@chromium.org,
andriy.shevchenko@linux.intel.com
Cc: linux-um@lists.infradead.org, linux-kernel@vger.kernel.org,
davidgow@google.com, heidifahim@google.com,
Brendan Higgins <brendanhiggins@google.com>
Subject: [RFC v1 0/2] arch: um: turn BTF_TYPEINFO support off
Date: Mon, 27 Jan 2020 11:35:47 -0800 [thread overview]
Message-ID: <20200127193549.187419-1-brendanhiggins@google.com> (raw)
As a part of my quest to get allyesconfig working on UML, I found a new
build error, with CONFIG_DEBUG_INFO_BTF=y:
scripts/link-vmlinux.sh: line 106: 17463 Segmentation fault LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
objcopy: --change-section-vma .BTF=0x0000000000000000 never used
objcopy: --change-section-lma .BTF=0x0000000000000000 never used
objcopy: error: the input file '.btf.vmlinux.bin' is empty
Failed to generate BTF for vmlinux
Try to disable CONFIG_DEBUG_INFO_BTF
make: *** [Makefile:1078: vmlinux] Error 1
The most interesting bit seems to be the:
objcopy: error: the input file '.btf.vmlinux.bin' is empty
Thinking about it, I am not sure if it makes sense for UML to produce
BTF type information, so I proposed a fix here that:
1. Adds the ability for architectures to turn BTF support off.
2. Turns BTF support off for UML.
I am also totally fine with just saying that DEBUG_INFO_BTF
depends on !UML, but I figured people would prefer this approach more.
Brendan Higgins (2):
kbuild: add arch specific dependency for BTF support
arch: um: turn BTF_TYPEINFO support off
arch/um/Kconfig | 1 +
lib/Kconfig.debug | 5 ++++-
2 files changed, 5 insertions(+), 1 deletion(-)
--
2.25.0.341.g760bfbb309-goog
next reply other threads:[~2020-01-27 19:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-27 19:35 Brendan Higgins [this message]
2020-01-27 19:35 ` [RFC v1 1/2] kbuild: add arch specific dependency for BTF support Brendan Higgins
2020-01-28 3:27 ` Masahiro Yamada
2020-01-28 7:25 ` Brendan Higgins
2020-01-27 19:35 ` [RFC v1 2/2] arch: um: turn BTF_TYPEINFO support off Brendan Higgins
2020-01-28 8:12 ` Anton Ivanov
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