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vmlinux.lds.h: Fix linker warnings about orphan .LPBX sections

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[ Upstream commit 52c8ee5bad ]

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>
This commit is contained in:
Peter Oberparleiter
2018-09-13 13:00:00 +02:00
committed by Greg Kroah-Hartman
parent e266c397e7
commit 9277b65e04
1 changed files with 1 additions and 1 deletions
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include/asm-generic/vmlinux.lds.h
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@@ -70,7 +70,7 @@
*/ */
#ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
#define TEXT_MAIN .text .text.[0-9a-zA-Z_]* #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 SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*