linux-kernel - Re: [PATCH] [RFC] ARM: MM: remove phy

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Message-ID: <53794841.6080308@lge.com>
Date:	Mon, 19 May 2014 08:54:41 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	Barry Song <21cnbao@...il.com>
CC:	Russell King <linux@....linux.org.uk>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Barry Song <Baohua.Song@....com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"이건호/책임연구원/SW Platform(연)AOT팀(gunho.lee@....com)" <gunho.lee@....com>,
	gurugio@...il.com
Subject: Re: [PATCH] [RFC] ARM: MM: remove phy_base field of struct

Thank you. It's my mistake.

2014-05-18 오후 10:18, Barry Song 쓴 글:
> 2014-05-15 10:49 GMT+08:00 Gioh Kim <gioh.kim@....com>:
>> Hi,
>>
>> It's not a big deal but I've found that phy_base field of struct
>> l2x0_regs is not used anywhere.
>> I've removed it on my board. It seems to be working fine.
>>
>> Why do we need physical address of L2 cache controller?
>> Is it removable?
>
> if you read the source codes of arch/arm/mach-imx/suspend-imx6.S, you
> will find it is needed.
>
>>
>>
>> ------------------------ 8< --------------------------
>>  From cc0d98f4ef8b6f8f139a7c6179ed0b03e9ad7d07 Mon Sep 17 00:00:00 2001
>> From: Gioh Kim <gioh.kim@....com>
>> Date: Thu, 15 May 2014 11:26:20 +0900
>> Subject: [PATCH] [RFC] ARM: MM: remove phy_base field of struct l2x0_regs
>>
>> Remove unused field, phy_base of struct l2x0_regs
>>
>> Signed-off-by: Gioh Kim <gioh.kim@....com>
>> ---
>>   arch/arm/include/asm/hardware/cache-l2x0.h |    1 -
>>   arch/arm/kernel/asm-offsets.c              |    1 -
>>   arch/arm/mm/cache-l2x0.c                   |    2 --
>>   3 files changed, 4 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/hardware/cache-l2x0.h
>> b/arch/arm/include/asm/hardware/cache-l2x0.h
>> index 6795ff7..6dec6da 100644
>> --- a/arch/arm/include/asm/hardware/cache-l2x0.h
>> +++ b/arch/arm/include/asm/hardware/cache-l2x0.h
>> @@ -118,7 +118,6 @@ static inline int l2x0_of_init(u32 aux_val, u32
>> aux_mask)
>>   #endif
>>
>>   struct l2x0_regs {
>> -       unsigned long phy_base;
>>          unsigned long aux_ctrl;
>>          /*
>>           * Whether the following registers need to be saved/restored
>> diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
>> index 85598b5..9b0ff94 100644
>> --- a/arch/arm/kernel/asm-offsets.c
>> +++ b/arch/arm/kernel/asm-offsets.c
>> @@ -100,7 +100,6 @@ int main(void)
>>     DEFINE(S_FRAME_SIZE,         sizeof(struct pt_regs));
>>     BLANK();
>>   #ifdef CONFIG_CACHE_L2X0
>> -  DEFINE(L2X0_R_PHY_BASE,      offsetof(struct l2x0_regs, phy_base));
>>     DEFINE(L2X0_R_AUX_CTRL,      offsetof(struct l2x0_regs, aux_ctrl));
>>     DEFINE(L2X0_R_TAG_LATENCY,   offsetof(struct l2x0_regs, tag_latency));
>>     DEFINE(L2X0_R_DATA_LATENCY,  offsetof(struct l2x0_regs, data_latency));
>> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
>> index 7abde2c..728d644 100644
>> --- a/arch/arm/mm/cache-l2x0.c
>> +++ b/arch/arm/mm/cache-l2x0.c
>> @@ -985,8 +985,6 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
>>          if (!l2x0_base)
>>                  return -ENOMEM;
>>
>> -       l2x0_saved_regs.phy_base = res.start;
>> -
>>          data = of_match_node(l2x0_ids, np)->data;
>>
>>          /* L2 configuration can only be changed if the cache is disabled */
>> --
>> 1.7.9.5
>
> -barry
>
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