linux-kernel - [PATCH v2 1/5] riscv: lds: define RUNTIME_DISCARD

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Message-Id: <20230119155417.2600-2-jszhang@kernel.org>
Date:   Thu, 19 Jan 2023 23:54:13 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>
Cc:     Conor Dooley <conor@...nel.org>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/5] riscv: lds: define RUNTIME_DISCARD_EXIT

riscv discards .exit.* sections at run-time but doesn't define
RUNTIME_DISCARD_EXIT. However, the .exit.* sections are still allocated
and kept even if the generic DISCARDS would discard the sections due
to missing RUNTIME_DISCARD_EXIT, because the DISCARD sits at the end of
the linker script. Add the missing RUNTIME_DISCARD_EXIT define so that
it still works if we move DISCARD up or even at the beginning of the
linker script.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
---
 arch/riscv/kernel/vmlinux.lds.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index 4e6c88aa4d87..07c19f2a288c 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -5,6 +5,7 @@
  */
 
 #define RO_EXCEPTION_TABLE_ALIGN	4
+#define RUNTIME_DISCARD_EXIT
 
 #ifdef CONFIG_XIP_KERNEL
 #include "vmlinux-xip.lds.S"
-- 
2.38.1