linux-kernel - [tip:efi/core] arm64/vmlinux.lds.S: Handle .init.rodata.xxx and .init.bss sections

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Message-ID: <tip-1ce99bf45306ba889faadced6baabebf7770c546@git.kernel.org>
Date:	Mon, 22 Feb 2016 04:14:31 -0800
From:	tip-bot for Ard Biesheuvel <tipbot@...or.com>@zytor.com
To:	linux-tip-commits@...r.kernel.org@...or.com
Cc:	hpa@...or.com, mark.rutland@....com, will.deacon@....com,
	ard.biesheuvel@...aro.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, matt@...eblueprint.co.uk, mingo@...nel.org,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [tip:efi/core] arm64/vmlinux.lds.S: Handle .init.rodata.xxx and .init.bss sections

Commit-ID:  1ce99bf45306ba889faadced6baabebf7770c546
Gitweb:     http://git.kernel.org/tip/1ce99bf45306ba889faadced6baabebf7770c546
Author:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
AuthorDate: Wed, 17 Feb 2016 12:35:58 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 22 Feb 2016 08:26:26 +0100

arm64/vmlinux.lds.S: Handle .init.rodata.xxx and .init.bss sections

The EFI stub is typically built into the decompressor (x86, ARM) so none
of its symbols are annotated as __init. However, on arm64, the stub is
linked into the kernel proper, and the code is __init annotated at the
section level by prepending all names of SHF_ALLOC sections with '.init'.

This results in section names like .init.rodata.str1.8 (for string literals)
and .init.bss (which is tiny), both of which can be moved into the .init.data
output section.

Tested-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
Acked-by: Will Deacon <will.deacon@....com>
Acked-by: Mark Rutland <mark.rutland@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-efi@...r.kernel.org
Link: http://lkml.kernel.org/r/1455712566-16727-6-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/arm64/kernel/vmlinux.lds.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index e3928f5..cbf4db4 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -134,6 +134,7 @@ SECTIONS
 		CON_INITCALL
 		SECURITY_INITCALL
 		INIT_RAM_FS
+		*(.init.rodata.* .init.bss)	/* from the EFI stub */
 	}
 	.exit.data : {
 		ARM_EXIT_KEEP(EXIT_DATA)