dummy/linux-stable-mirror
1
0
Fork 1
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2025-04-19 20:58:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

ARM: 9443/1: Require linker to support KEEP within OVERLAY for DCE

Browse Source 
commit e7607f7d6d81af71dcc5171278aadccc94d277cd upstream.

ld.lld prior to 21.0.0 does not support using the KEEP keyword within an
overlay description, which may be needed to avoid discarding necessary
sections within an overlay with '--gc-sections', which can be enabled
for the kernel via CONFIG_LD_DEAD_CODE_DATA_ELIMINATION.

Disallow CONFIG_LD_DEAD_CODE_DATA_ELIMINATION without support for KEEP
within OVERLAY and introduce a macro, OVERLAY_KEEP, that can be used to
conditionally add KEEP when it is properly supported to avoid breaking
old versions of ld.lld.

Cc: stable@vger.kernel.org
Link: 381599f1fe
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
[nathan: Fix conflict in init/Kconfig due to lack of RUSTC symbols]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nathan Chancellor 2025-03-20 22:33:49 +01:00 committed by Greg Kroah-Hartman
parent c6f2a8146d
commit 59fc423183
3 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/Kconfig
View File

@ -118,7 +118,7 @@ config ARM
select HAVE_KERNEL_XZ
select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
select HAVE_KRETPROBES if HAVE_KPROBES
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >= 23600 || LD_IS_LLD)
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >= 23600 || LD_CAN_USE_KEEP_IN_OVERLAY)
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
select HAVE_OPTPROBES if !THUMB2_KERNEL

6
arch/arm/include/asm/vmlinux.lds.h
View File

@ -34,6 +34,12 @@
#define NOCROSSREFS
#endif
#ifdef CONFIG_LD_CAN_USE_KEEP_IN_OVERLAY
#define OVERLAY_KEEP(x) KEEP(x)
#else
#define OVERLAY_KEEP(x) x
#endif
/* Set start/end symbol names to the LMA for the section */
#define ARM_LMA(sym, section) \
sym##_start = LOADADDR(section); \

5
init/Kconfig
View File

@ -129,6 +129,11 @@ config CC_HAS_COUNTED_BY
# https://github.com/llvm/llvm-project/pull/112636
depends on !(CC_IS_CLANG && CLANG_VERSION < 190103)
config LD_CAN_USE_KEEP_IN_OVERLAY
# ld.lld prior to 21.0.0 did not support KEEP within an overlay description
# https://github.com/llvm/llvm-project/pull/130661
def_bool LD_IS_BFD || LLD_VERSION >= 210000
config PAHOLE_VERSION
int
default $(shell,$(srctree)/scripts/pahole-version.sh $(PAHOLE))