linux-kernel - [PATCH v2 1/2] arm64/build: Use common DISCARDS in linker script

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Message-Id: <20200622205815.2988115-2-keescook@chromium.org>
Date:   Mon, 22 Jun 2020 13:58:14 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Will Deacon <will@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        clang-built-linux@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] arm64/build: Use common DISCARDS in linker script

Use the common DISCARDS rule for the linker script in an effort to
regularize the linker script to prepare for warning on orphaned
sections. Additionally clean up left-over no-op macros.

Signed-off-by: Kees Cook <keescook@...omium.org>
Acked-by: Will Deacon <will@...nel.org>
---
 arch/arm64/kernel/vmlinux.lds.S | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 6827da7f3aa5..5427f502c3a6 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -6,6 +6,7 @@
  */
 
 #define RO_EXCEPTION_TABLE_ALIGN	8
+#define RUNTIME_DISCARD_EXIT
 
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>
@@ -89,10 +90,8 @@ SECTIONS
 	 * matching the same input section name.  There is no documented
 	 * order of matching.
 	 */
+	DISCARDS
 	/DISCARD/ : {
-		EXIT_CALL
-		*(.discard)
-		*(.discard.*)
 		*(.interp .dynamic)
 		*(.dynsym .dynstr .hash .gnu.hash)
 		*(.eh_frame)
-- 
2.25.1