d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Work around VNET and DPCPU related panics on aarch64

Browse Source 
lld >= 14 and recent GNU ld can relax adrp+add and adrp+ldr
instructions, which breaks VNET and DPCPU when used in modules.

Until VNET and DPCPU can be fixed to deal with these relaxed
instructions, disable linker relaxation for now.

PR:		264094
Reviewed by:	markj
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D41156
This commit is contained in:
Dimitry Andric 2023-07-23 15:48:36 +02:00
parent 058d1722b0
commit 80e4ac2964
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
sys/conf/kmod.mk
View File

@ -170,6 +170,13 @@ CFLAGS+= -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
CFLAGS+= -fPIC
.endif
.if ${MACHINE_CPUARCH} == "aarch64"
# https://bugs.freebsd.org/264094
# lld >= 14 and recent GNU ld can relax adrp+add and adrp+ldr instructions,
# which breaks VNET.
LDFLAGS+= --no-relax
.endif
# Temporary workaround for PR 196407, which contains the fascinating details.
# Don't allow clang to use fpu instructions or registers in kernel modules.
.if ${MACHINE_CPUARCH} == arm