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[ 04/41] MIPS: Properly align the .data..init_task section.

To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [ 04/41] MIPS: Properly align the .data..init_task section.
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon, 30 Jul 2012 10:31:03 -0700
Cc: Greg KH <gregkh@linuxfoundation.org>, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, David Daney <david.daney@cavium.com>, Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
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From: Greg KH <gregkh@linuxfoundation.org>

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Daney <david.daney@cavium.com>

commit 7b1c0d26a8e272787f0f9fcc5f3e8531df3b3409 upstream.

Improper alignment can lead to unbootable systems and/or random
crashes.

[ralf@linux-mips.org: This is a lond standing bug since
6eb10bc9e2deab06630261cd05c4cb1e9a60e980 (kernel.org) rsp.
c422a10917f75fd19fa7fe070aaaa23e384dae6f (lmo) [MIPS: Clean up linker script
using new linker script macros.] so dates back to 2.6.32.]

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3881/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/include/asm/thread_info.h |    4 ++--
 arch/mips/kernel/vmlinux.lds.S      |    3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -60,6 +60,8 @@ struct thread_info {
 register struct thread_info *__current_thread_info __asm__("$28");
 #define current_thread_info()  __current_thread_info
 
+#endif /* !__ASSEMBLY__ */
+
 /* thread information allocation */
 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
 #define THREAD_SIZE_ORDER (1)
@@ -97,8 +99,6 @@ register struct thread_info *__current_t
 
 #define free_thread_info(info) kfree(info)
 
-#endif /* !__ASSEMBLY__ */
-
 #define PREEMPT_ACTIVE         0x10000000
 
 /*
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -1,5 +1,6 @@
 #include <asm/asm-offsets.h>
 #include <asm/page.h>
+#include <asm/thread_info.h>
 #include <asm-generic/vmlinux.lds.h>
 
 #undef mips
@@ -73,7 +74,7 @@ SECTIONS
        .data : {       /* Data */
                . = . + DATAOFFSET;             /* for CONFIG_MAPPED_KERNEL */
 
-               INIT_TASK_DATA(PAGE_SIZE)
+               INIT_TASK_DATA(THREAD_SIZE)
                NOSAVE_DATA
                CACHELINE_ALIGNED_DATA(1 << CONFIG_MIPS_L1_CACHE_SHIFT)
                READ_MOSTLY_DATA(1 << CONFIG_MIPS_L1_CACHE_SHIFT)



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