linux-kernel - Re: [PATCH 0/6] LLVMLinux: Patches to enable the kernel to be compiled with clang/LLVM

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Date:	Sun, 13 Jul 2014 05:10:59 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	behanw@...verseincode.com
cc:	anurag19aggarwal@...il.com, catalin.marinas@....com,
	charlebm@...il.com, dave.long@...aro.org, k.khlebnikov@...sung.com,
	linux@....linux.org.uk, linyongting@...il.com,
	Nikolay.Borisov@....com, tglx@...utronix.de,
	u.kleine-koenig@...gutronix.de, will.deacon@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	rabin@....in, rostedt@...dmis.org, dwmw2@...radead.org
Subject: Re: [PATCH 0/6] LLVMLinux: Patches to enable the kernel to be compiled
 with clang/LLVM

On Tue, 8 Jul 2014, behanw@...verseincode.com wrote:

> From: Behan Webster <behanw@...verseincode.com>
> 
> The LLVMLinux project aims to fully build the Linux kernel using both gcc and
> clang (the C front end for the LLVM compiler infrastructure project). 
> 
> Clang only supports global named registers for non-allocatable registers like
> the stack pointer. By centralizing the definition of current_stack_pointer, the
> use of named registers for ARM remains largely unchanged while working for both
> gcc and clang.

You verified that the compiled code is identical on gcc?  If so:

Acked-by: Nicolas Pitre <nico@...aro.org>

> 
> Behan Webster (6):
>   arm: LLVMLinux: Add global named register current_stack_pointer for
>     ARM
>   arm: LLVMLinux: Use current_stack_pointer to calculate pt_regs address
>   arm: LLVMLinux: Use current_stack_pointer for return_address
>   arm: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk
>   arm: LLVMLinux: Calculate current_thread_info from
>     current_stack_pointer
>   arm: LLVMLinux: Use current_stack_pointer in unwind_backtrace
> 
>  arch/arm/include/asm/ptrace.h      | 5 ++---
>  arch/arm/include/asm/thread_info.h | 9 +++++++--
>  arch/arm/kernel/return_address.c   | 3 +--
>  arch/arm/kernel/stacktrace.c       | 4 +---
>  arch/arm/kernel/unwind.c           | 3 +--
>  5 files changed, 12 insertions(+), 12 deletions(-)
> 
> -- 
> 1.9.1
> 
> --
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