Date: Tue, 1 Aug 2023 20:04:16 GMT From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: e3e6fc371322 - releng/13.2 - Work around VNET and DPCPU related panics on aarch64 Message-ID: <202308012004.371K4Gge013019@gitrepo.freebsd.org>
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The branch releng/13.2 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=e3e6fc3713229e5075473b9e0e9a66699e8a322b commit e3e6fc3713229e5075473b9e0e9a66699e8a322b Author: Dimitry Andric <dim@FreeBSD.org> AuthorDate: 2023-07-23 13:48:36 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2023-08-01 19:50:47 +0000 Work around VNET and DPCPU related panics on aarch64 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 (cherry picked from commit 80e4ac2964a11edef456a15b77e43aadeaf273a2) (cherry picked from commit f1f27dfa4ad9da53fcdfc6aae644fab83bda4e76) Approved by: so Security: FreeBSD-EN-23:08.vnet --- sys/conf/kmod.mk | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sys/conf/kmod.mk b/sys/conf/kmod.mk index 2a2ab1d02277..b616be508ce4 100644 --- a/sys/conf/kmod.mk +++ b/sys/conf/kmod.mk @@ -168,6 +168,13 @@ 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
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