[PATCH AUTOSEL 4.18 24/27] vmlinux.lds.h: Fix incomplete .text.exit discards

[Sasha Levin]

From: Peter Oberparleiter <ober...@linux.ibm.com>

[ Upstream commit 8dcf86caa1e3daf4a6ccf38e97f4f752b411f829 ]

Enabling CONFIG_GCOV_PROFILE_ALL=y causes linker errors on ARM:

  `.text.exit' referenced in section `.ARM.exidx.text.exit':
  defined in discarded section `.text.exit'

  `.text.exit' referenced in section `.fini_array.00100':
  defined in discarded section `.text.exit'

And related errors on NDS32:

  `.text.exit' referenced in section `.dtors.65435':
  defined in discarded section `.text.exit'

The gcov compiler flags cause certain compiler versions to generate
additional destructor-related sections that are not yet handled by the
linker script, resulting in references between discarded and
non-discarded sections.

Since destructors are not used in the Linux kernel, fix this by
discarding these additional sections.

Reported-by: Arnd Bergmann <a...@arndb.de>
Tested-by: Arnd Bergmann <a...@arndb.de>
Acked-by: Arnd Bergmann <a...@arndb.de>
Reported-by: Greentime Hu <green...@gmail.com>
Tested-by: Masami Hiramatsu <mhira...@kernel.org>
Signed-off-by: Peter Oberparleiter <ober...@linux.ibm.com>
Signed-off-by: Stephen Rothwell <s...@canb.auug.org.au>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 arch/arm/kernel/vmlinux.lds.h     | 2 ++
 include/asm-generic/vmlinux.lds.h | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/vmlinux.lds.h b/arch/arm/kernel/vmlinux.lds.h
index ae5fdff18406..8247bc15addc 100644
--- a/arch/arm/kernel/vmlinux.lds.h
+++ b/arch/arm/kernel/vmlinux.lds.h
@@ -49,6 +49,8 @@
 #define ARM_DISCARD                                                    \
                *(.ARM.exidx.exit.text)                                 \
                *(.ARM.extab.exit.text)                                 \
+               *(.ARM.exidx.text.exit)                                 \
+               *(.ARM.extab.text.exit)                                 \
                ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))             \
                ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))             \
                ARM_EXIT_DISCARD(EXIT_TEXT)                             \
diff --git a/include/asm-generic/vmlinux.lds.h 
b/include/asm-generic/vmlinux.lds.h
index e373e2e10f6a..a11f86014352 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -617,8 +617,8 @@
 
 #define EXIT_DATA                                                      \
        *(.exit.data .exit.data.*)                                      \
-       *(.fini_array)                                                  \
-       *(.dtors)                                                       \
+       *(.fini_array .fini_array.*)                                    \
+       *(.dtors .dtors.*)                                              \
        MEM_DISCARD(exit.data*)                                         \
        MEM_DISCARD(exit.rodata*)
 
-- 
2.17.1