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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Nathan Chancellor <nathan@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 4.14 20/31] ARM: Do not use NOCROSSREFS directive with ld.lld
Date: Thu, 10 Mar 2022 15:18:33 +0100	[thread overview]
Message-ID: <20220310140808.125761504@linuxfoundation.org> (raw)
In-Reply-To: <20220310140807.524313448@linuxfoundation.org>

From: Nathan Chancellor <nathan@kernel.org>

commit 36168e387fa7d0f1fe0cd5cf76c8cea7aee714fa upstream.

ld.lld does not support the NOCROSSREFS directive at the moment, which
breaks the build after commit b9baf5c8c5c3 ("ARM: Spectre-BHB
workaround"):

  ld.lld: error: ./arch/arm/kernel/vmlinux.lds:34: AT expected, but got NOCROSSREFS

Support for this directive will eventually be implemented, at which
point a version check can be added. To avoid breaking the build in the
meantime, just define NOCROSSREFS to nothing when using ld.lld, with a
link to the issue for tracking.

Cc: stable@vger.kernel.org
Fixes: b9baf5c8c5c3 ("ARM: Spectre-BHB workaround")
Link: https://github.com/ClangBuiltLinux/linux/issues/1609
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm/kernel/vmlinux-xip.lds.S |    8 ++++++++
 arch/arm/kernel/vmlinux.lds.S     |    8 ++++++++
 2 files changed, 16 insertions(+)

--- a/arch/arm/kernel/vmlinux-xip.lds.S
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -13,6 +13,14 @@
 #include <asm/memory.h>
 #include <asm/page.h>
 
+/*
+ * ld.lld does not support NOCROSSREFS:
+ * https://github.com/ClangBuiltLinux/linux/issues/1609
+ */
+#ifdef CONFIG_LD_IS_LLD
+#define NOCROSSREFS
+#endif
+
 /* Set start/end symbol names to the LMA for the section */
 #define ARM_LMA(sym, section)						\
 	sym##_start = LOADADDR(section);				\
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -15,6 +15,14 @@
 #include <asm/page.h>
 #include <asm/pgtable.h>
 
+/*
+ * ld.lld does not support NOCROSSREFS:
+ * https://github.com/ClangBuiltLinux/linux/issues/1609
+ */
+#ifdef CONFIG_LD_IS_LLD
+#define NOCROSSREFS
+#endif
+
 /* Set start/end symbol names to the LMA for the section */
 #define ARM_LMA(sym, section)						\
 	sym##_start = LOADADDR(section);				\



  parent reply	other threads:[~2022-03-10 14:22 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-10 14:18 [PATCH 4.14 00/31] 4.14.271-rc2 review Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 01/31] x86/speculation: Merge one test in spectre_v2_user_select_mitigation() Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 02/31] x86,bugs: Unconditionally allow spectre_v2=retpoline,amd Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 03/31] x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 04/31] x86/speculation: Add eIBRS + Retpoline options Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 05/31] Documentation/hw-vuln: Update spectre doc Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 06/31] x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 07/31] x86/speculation: Use generic retpoline by default on AMD Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 08/31] x86/speculation: Update link to AMD speculation whitepaper Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 09/31] x86/speculation: Warn about Spectre v2 LFENCE mitigation Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 10/31] x86/speculation: Warn about eIBRS + LFENCE + Unprivileged eBPF + SMT Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 11/31] arm/arm64: Provide a wrapper for SMCCC 1.1 calls Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 12/31] arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit() Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 13/31] ARM: report Spectre v2 status through sysfs Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 14/31] ARM: early traps initialisation Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 15/31] ARM: use LOADADDR() to get load address of sections Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 16/31] ARM: Spectre-BHB workaround Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 17/31] ARM: include unprivileged BPF status in Spectre V2 reporting Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 18/31] ARM: fix build error when BPF_SYSCALL is disabled Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 19/31] ARM: fix co-processor register typo Greg Kroah-Hartman
2022-03-10 14:18 ` Greg Kroah-Hartman [this message]
2022-03-10 14:18 ` [PATCH 4.14 21/31] ARM: fix build warning in proc-v7-bugs.c Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 22/31] xen/xenbus: dont let xenbus_grant_ring() remove grants in error case Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 23/31] xen/grant-table: add gnttab_try_end_foreign_access() Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 24/31] xen/blkfront: dont use gnttab_query_foreign_access() for mapped status Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 25/31] xen/netfront: " Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 26/31] xen/scsifront: " Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 27/31] xen/gntalloc: dont use gnttab_query_foreign_access() Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 28/31] xen: remove gnttab_query_foreign_access() Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 29/31] xen/9p: use alloc/free_pages_exact() Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 30/31] xen/gnttab: fix gnttab_end_foreign_access() without page specified Greg Kroah-Hartman
2022-03-10 14:18 ` [PATCH 4.14 31/31] xen/netfront: react properly to failing gnttab_end_foreign_access_ref() Greg Kroah-Hartman
2022-03-10 18:48 ` [PATCH 4.14 00/31] 4.14.271-rc2 review Jon Hunter
2022-03-11  1:01 ` Guenter Roeck
2022-03-11 13:18 ` Naresh Kamboju

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