linux-kernel - [PATCH] arm64: add PAGE_ALIGNED

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Date:	Tue,  8 Oct 2013 16:37:39 -0400
From:	Mark Salter <msalter@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Salter <msalter@...hat.com>
Subject: [PATCH] arm64: add PAGE_ALIGNED_DATA to linker script

The arm64 linker script doesn't use the PAGE_ALIGNED_DATA macro which
leads to a ".data..page_aligned" section being placed between the end
of .data and start of .bss:

 % readelf -e vmlinux
   ...
 Section to Segment mapping:
  Segment Sections...
   00     .head.text .text .text.init .rodata __ksymtab __ksymtab_gpl \
          __ksymtab_strings __param __modver __ex_table .notes \
          .init.text .init.data .data..percpu .data .data..page_aligned .bss

This causes problems for the EFI stub which may have to relocate the
kernel image based on stext and _edata symbols.

This patch adds PAGE_ALIGNED_DATA() to the linker script inside the
the .data section.

Signed-off-by: Mark Salter <msalter@...hat.com>
---
 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 f8ab9d8..e441556 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -110,6 +110,7 @@ SECTIONS
 		 */
 		INIT_TASK_DATA(THREAD_SIZE)
 		NOSAVE_DATA
+		PAGE_ALIGNED_DATA(PAGE_SIZE)
 		CACHELINE_ALIGNED_DATA(64)
 		READ_MOSTLY_DATA(64)
 
-- 
1.8.3.1

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