linux-kernel - [PATCH 2/2] arch/x86: Drop unneeded linker script discard of .eh

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Message-Id: <20200223193715.83729-3-nivedita@alum.mit.edu>
Date:   Sun, 23 Feb 2020 14:37:15 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Michael Matz <matz@...e.de>, Fangrui Song <maskray@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH 2/2] arch/x86: Drop unneeded linker script discard of .eh_frame

Now that we don't generate .eh_frame sections for the files in setup.elf
and realmode.elf, the linker scripts don't need the /DISCARD/ any more.

Also remove the one in the main kernel linker script, since there are no
.eh_frame sections already.

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
---
 arch/x86/boot/setup.ld              | 1 -
 arch/x86/kernel/vmlinux.lds.S       | 3 ---
 arch/x86/realmode/rm/realmode.lds.S | 1 -
 3 files changed, 5 deletions(-)

diff --git a/arch/x86/boot/setup.ld b/arch/x86/boot/setup.ld
index 3da1c37c6dd5..24c95522f231 100644
--- a/arch/x86/boot/setup.ld
+++ b/arch/x86/boot/setup.ld
@@ -52,7 +52,6 @@ SECTIONS
 	_end = .;
 
 	/DISCARD/	: {
-		*(.eh_frame)
 		*(.note*)
 	}
 
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index e3296aa028fe..54f7b9f46446 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -412,9 +412,6 @@ SECTIONS
 	DWARF_DEBUG
 
 	DISCARDS
-	/DISCARD/ : {
-		*(.eh_frame)
-	}
 }
 
 
diff --git a/arch/x86/realmode/rm/realmode.lds.S b/arch/x86/realmode/rm/realmode.lds.S
index 64d135d1ee63..63aa51875ba0 100644
--- a/arch/x86/realmode/rm/realmode.lds.S
+++ b/arch/x86/realmode/rm/realmode.lds.S
@@ -71,7 +71,6 @@ SECTIONS
 	/DISCARD/ : {
 		*(.note*)
 		*(.debug*)
-		*(.eh_frame*)
 	}
 
 #include "pasyms.h"
-- 
2.24.1