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Date:	Fri,  8 Aug 2014 13:38:27 -0700
From:	Kamal Mostafa <>
Cc:	Colin Cross <>,
	Catalin Marinas <>,
	Kamal Mostafa <>
Subject: [PATCH 3.13 084/259] arm64: implement TASK_SIZE_OF -stable review patch.  If anyone has any objections, please let me know.


From: Colin Cross <>

commit fa2ec3ea10bd377f9d55772b1dab65178425a1a2 upstream.

include/linux/sched.h implements TASK_SIZE_OF as TASK_SIZE if it
is not set by the architecture headers.  TASK_SIZE uses the
current task to determine the size of the virtual address space.
On a 64-bit kernel this will cause reading /proc/pid/pagemap of a
64-bit process from a 32-bit process to return EOF when it reads
past 0xffffffff.

Implement TASK_SIZE_OF exactly the same as TASK_SIZE with
test_tsk_thread_flag instead of test_thread_flag.

Signed-off-by: Colin Cross <>
Acked-by: Will Deacon <>
Signed-off-by: Catalin Marinas <>
Signed-off-by: Kamal Mostafa <>
 arch/arm64/include/asm/memory.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 3776217..acc3efa 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -56,6 +56,8 @@
 #define TASK_SIZE_32		UL(0x100000000)
 #define TASK_SIZE		(test_thread_flag(TIF_32BIT) ? \
 				TASK_SIZE_32 : TASK_SIZE_64)
+#define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_32BIT) ? \
+				TASK_SIZE_32 : TASK_SIZE_64)
 #define TASK_SIZE		TASK_SIZE_64
 #endif /* CONFIG_COMPAT */

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