linux-kernel - [tip: x86/boot] x86/boot/compressed: Remove unnecessary sections from bzImage

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Message-ID: <158213131544.13786.16073593038276169304.tip-bot2@tip-bot2>
Date:   Wed, 19 Feb 2020 16:55:15 -0000
From:   "tip-bot2 for Arvind Sankar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Borislav Petkov <bp@...e.de>,
        Kees Cook <keescook@...omium.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/boot] x86/boot/compressed: Remove unnecessary sections from bzImage

The following commit has been merged into the x86/boot branch of tip:

Commit-ID:     e11831d0ada3efc7f9268f35c80257f7e1b1dd0c
Gitweb:        https://git.kernel.org/tip/e11831d0ada3efc7f9268f35c80257f7e1b1dd0c
Author:        Arvind Sankar <nivedita@...m.mit.edu>
AuthorDate:    Thu, 09 Jan 2020 10:02:18 -05:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Wed, 19 Feb 2020 17:35:30 +01:00

x86/boot/compressed: Remove unnecessary sections from bzImage

Discarding the sections that are unused in the compressed kernel saves
about 10 KiB on 32-bit and 6 KiB on 64-bit, mostly from .eh_frame.

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Kees Cook <keescook@...omium.org>
Link: https://lkml.kernel.org/r/20200109150218.16544-2-nivedita@alum.mit.edu
---
 arch/x86/boot/compressed/vmlinux.lds.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S
index 508cfa6..12a2060 100644
--- a/arch/x86/boot/compressed/vmlinux.lds.S
+++ b/arch/x86/boot/compressed/vmlinux.lds.S
@@ -73,4 +73,9 @@ SECTIONS
 #endif
 	. = ALIGN(PAGE_SIZE);	/* keep ZO size page aligned */
 	_end = .;
+
+	/* Discard all remaining sections */
+	/DISCARD/ : {
+		*(*)
+	}
 }