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From: Nick Desaulniers <>
To: Will Deacon <>
Cc: Catalin Marinas <>,,
	 Lee Jones <>,
	Masahiro Yamada <>,
	 clang-built-linux <>,
	Fangrui Song <>,
	 Elliot Berman <>,
	Sami Tolvanen <>,
	 Peter Collingbourne <>,
	Michal Marek <>,,,
	Nick Desaulniers <>,
	 Nathan Chancellor <>
Subject: [PATCH v2] Makefile: fix GDB warning with CONFIG_RELR
Date: Fri, 21 May 2021 18:26:24 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

GDB produces the following warning when debugging kernels built with

BFD: /android0/linux-next/vmlinux: unknown type [0x13] section `.relr.dyn'

when loading a kernel built with CONFIG_RELR into GDB. It can also
prevent debugging symbols using such relocations.

Peter sugguests:
  [That flag] means that lld will use dynamic tags and section type
  numbers in the OS-specific range rather than the generic range. The
  kernel itself doesn't care about these numbers; it determines the
  location of the RELR section using symbols defined by a linker script.

Suggested-by: Peter Collingbourne <>
Reviewed-by: Nathan Chancellor <>
Signed-off-by: Nick Desaulniers <>
Changes V1 -> V2:
* rebase
* pick up Nathan's reviewed by tag.

 Makefile                      | 2 +-
 scripts/ | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 0ed7e061c8e9..2dbb56f831d4 100644
--- a/Makefile
+++ b/Makefile
@@ -1031,7 +1031,7 @@ LDFLAGS_vmlinux	+= $(call ld-option, -X,)
 ifeq ($(CONFIG_RELR),y)
-LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
+LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
 # We never want expected sections to be placed heuristically by the
diff --git a/scripts/ b/scripts/
index 45e8aa360b45..cb55878bd5b8 100755
--- a/scripts/
+++ b/scripts/
@@ -7,7 +7,8 @@ trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
 cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
 void *p = &p;
-$LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file
+$LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr \
+  --use-android-relr-tags -o $tmp_file
 # Despite printing an error message, GNU nm still exits with exit code 0 if it
 # sees a relr section. So we need to check that nothing is printed to stderr.

base-commit: 45af60e7ced07ae3def41368c3d260dbf496fbce

linux-arm-kernel mailing list

       reply	other threads:[~2021-05-22  1:28 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2021-05-22  1:26 ` Nick Desaulniers [this message]
2021-05-26 17:09   ` [PATCH v2] Makefile: fix GDB warning with CONFIG_RELR Will Deacon
2021-06-04 18:55     ` Nick Desaulniers
2021-06-08 13:21   ` Will Deacon

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