linux-kernel - Re: [PATCH 18/32] hexagon: delete __cpuinit usage from all hexagon files

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Date:	Mon, 08 Jul 2013 12:01:58 -0500
From:	Richard Kuo <rkuo@...eaurora.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	linux-kernel@...r.kernel.org, linux-hexagon@...r.kernel.org
Subject: Re: [PATCH 18/32] hexagon: delete __cpuinit usage from all hexagon
 files

On 06/24/2013 02:30 PM, Paul Gortmaker wrote:
> The __cpuinit type of throwaway sections might have made sense
> some time ago when RAM was more constrained, but now the savings
> do not offset the cost and complications.  For example, the fix in
> commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
> is a good example of the nasty type of bugs that can be created
> with improper use of the various __init prefixes.
>
> After a discussion on LKML[1] it was decided that cpuinit should go
> the way of devinit and be phased out.  Once all the users are gone,
> we can then finally remove the macros themselves from linux/init.h.
>
> Note that some harmless section mismatch warnings may result, since
> notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
> are flagged as __cpuinit  -- so if we remove the __cpuinit from
> arch specific callers, we will also get section mismatch warnings.
> As an intermediate step, we intend to turn the linux/init.h cpuinit
> content into no-ops as early as possible, since that will get rid
> of these warnings.  In any case, they are temporary and harmless.
>
> This removes all the arch/hexagon uses of the __cpuinit macros from
> all C files.  Currently hexagon does not have any __CPUINIT used in
> assembly files.
>
> [1] https://lkml.org/lkml/2013/5/20/589
>
> Cc: Richard Kuo <rkuo@...eaurora.org>
> Cc: linux-hexagon@...r.kernel.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>
> [This commit is part of the __cpuinit removal work.  If you don't see
>   any problems with it, then you don't have to do anything ; it will be
>   submitted with all the rest of the __cpuinit removal work.  On the
>   other hand, if you want to carry this patch in with your other pending
>   changes so as to handle conflicts with other pending work yourself, then
>   that is fine too, as the commits can largely be treated independently.
>   For more information, please see: https://lkml.org/lkml/2013/6/20/513 ]
>
>   arch/hexagon/kernel/setup.c | 2 +-
>   arch/hexagon/kernel/smp.c   | 4 ++--
>   2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/hexagon/kernel/setup.c b/arch/hexagon/kernel/setup.c
> index bfe1331..29d1f1b 100644
> --- a/arch/hexagon/kernel/setup.c
> +++ b/arch/hexagon/kernel/setup.c
> @@ -41,7 +41,7 @@ static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
>   
>   int on_simulator;
>   
> -void __cpuinit calibrate_delay(void)
> +void calibrate_delay(void)
>   {
>   	loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
>   }
> diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
> index 0e364ca..9faaa94 100644
> --- a/arch/hexagon/kernel/smp.c
> +++ b/arch/hexagon/kernel/smp.c
> @@ -146,7 +146,7 @@ void __init smp_prepare_boot_cpu(void)
>    * to point to current thread info
>    */
>   
> -void __cpuinit start_secondary(void)
> +void start_secondary(void)
>   {
>   	unsigned int cpu;
>   	unsigned long thread_ptr;
> @@ -194,7 +194,7 @@ void __cpuinit start_secondary(void)
>    * maintains control until "cpu_online(cpu)" is set.
>    */
>   
> -int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle)
> +int __cpu_up(unsigned int cpu, struct task_struct *idle)
>   {
>   	struct thread_info *thread = (struct thread_info *)idle->stack;
>   	void *stack_start;

Acked-by: Richard Kuo <rkuo@...eaurora.org>


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