linux-kernel - [PATCH] arm: LLVMLinux: Use __builtin_frame

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Date:	Fri,  6 Sep 2013 17:47:39 -0400
From:	behanw@...verseincode.com
To:	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	behanw@...verseincode.com,
	Russell King <rmk+kernel@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Wade Farnsworth <wade_farnsworth@...tor.com>,
	Will Drewry <wad@...omium.org>
Subject: [PATCH] arm: LLVMLinux: Use __builtin_frame_address to get thread info

From: Behan Webster <behanw@...verseincode.com>

The LLVMLinux Project is working to be able to build the Linux kernel with
clang/LLVM. With the release of LLVM 3.3 clang is now able to compile the Linux
kernel with a number of small patches (available from the LLVMLinux git repo).

Use the frame pointer to calculate the start of the stack for current_thread_info()
The existing code uses the stack pointer to do this calculation.
Using the frame pointer yeilds the same value in a portable way.
This change supports being able to compile the kernel with gcc and Clang.

Behan Webster (1):
  arm: LLVMLinux: Calculate current_thread_info from fp

 arch/arm/include/asm/thread_info.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
1.8.1.2

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