4.18-stable review patch. If anyone has any objections, please let me know.
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[ 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 arnd@arndb.de Tested-by: Arnd Bergmann arnd@arndb.de Acked-by: Arnd Bergmann arnd@arndb.de Reported-by: Greentime Hu green.hu@gmail.com Tested-by: Masami Hiramatsu mhiramat@kernel.org Signed-off-by: Peter Oberparleiter oberpar@linux.ibm.com Signed-off-by: Stephen Rothwell sfr@canb.auug.org.au Signed-off-by: Sasha Levin sashal@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*)