4.18-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 52c8ee5bad8f33d02c567f6609f43d69303fc48d ]
Enabling both CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y and CONFIG_GCOV_PROFILE_ALL=y results in linker warnings:
warning: orphan section `.data..LPBX1' being placed in section `.data..LPBX1'.
LD_DEAD_CODE_DATA_ELIMINATION adds compiler flag -fdata-sections. This option causes GCC to create separate data sections for data objects, including those generated by GCC internally for gcov profiling. The names of these objects start with a dot (.LPBX0, .LPBX1), resulting in section names starting with 'data..'.
As section names starting with 'data..' are used for specific purposes in the Linux kernel, the linker script does not automatically include them in the output data section, resulting in the "orphan section" linker warnings.
Fix this by specifically including sections named "data..LPBX*" in the data section.
Reported-by: Stephen Rothwell sfr@canb.auug.org.au Tested-by: Stephen Rothwell sfr@canb.auug.org.au Tested-by: Arnd Bergmann arnd@arndb.de Acked-by: Arnd Bergmann arnd@arndb.de 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 --- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index a11f86014352..83b930988e21 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -70,7 +70,7 @@ */ #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* -#define DATA_MAIN .data .data.[0-9a-zA-Z_]* +#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX* #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*