linux-kernel - Re: Corrected data type mismatch

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Message-Id: <029A97EE-F051-4E8A-93E9-C259D2A7622E@gmail.com>
Date:	Tue, 16 Nov 2010 21:16:36 +0800
From:	bhs <haishan.bai@...il.com>
To:	DDD <dongdong.deng@...driver.com>
Cc:	Milton Miller <miltonm@....com>, Hai Shan <shan.hai@...driver.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net
Subject: Re: Corrected data type mismatch


On Nov 16, 2010, at 8:07 PM, DDD wrote:

> Milton Miller wrote:
>> [added cc's based on from ff10b88b5a05c8f1646dd15fb9f6093c1384ff6d,
>> which added the patched line ]
>> https://patchwork.kernel.org/patch/323022/
>> On Sun, 14 Nov 2010 around 02:06:59 -0000, Hai Shan wrote:
>>> Corrected data type mismatch
>>> 
>> This merely hides the type mismatch by force casting it.
>> Looking at the context I believe the intent is to copy the the value to
>> or from the register content slot, not take the previous value of the
>> register and use that as an address to copy to or from.
> 
> 
> OOPS! It is wrong here, The right one should be as following:
> 
> -   memcpy(mem, current->thread.evr[regno-32],
> +   memcpy(mem, (void*)&current->thread.evr[regno-32], dbg_reg_def[regno].size);
> 
> Thanks milton & Shan.Hai, I will send out the fix to Jason ASAP.
> 


Sorry for my crude fix :)


> Dongdong
> 
> 
>> milton
>>> Signed-off-by: Hai Shan <shan.hai@...driver.com>
>>> 
>>> ---
>>> arch/powerpc/kernel/kgdb.c |    4 ++--
>>> 1 files changed, 2 insertions(+), 2 deletions(-)
>>> 
>>> diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
>>> index 7a9db64..c5ce65f 100644
>>> --- a/arch/powerpc/kernel/kgdb.c
>>> +++ b/arch/powerpc/kernel/kgdb.c
>>> @@ -337,7 +337,7 @@ char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
>>> 		/* FP registers 32 -> 63 */
>>> #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
>>> 		if (current)
>>> -			memcpy(mem, current->thread.evr[regno-32],
>>> +			memcpy(mem, (void *)current->thread.evr[regno-32],
>>> 					dbg_reg_def[regno].size);
>>> #else
>>> 		/* fp registers not used by kernel, leave zero */
>>> @@ -362,7 +362,7 @@ int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
>>> 	if (regno >= 32 && regno < 64) {
>>> 		/* FP registers 32 -> 63 */
>>> #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
>>> -		memcpy(current->thread.evr[regno-32], mem,
>>> +		memcpy((void *)current->thread.evr[regno-32], mem,
>>> 				dbg_reg_def[regno].size);
>>> #else
>>> 		/* fp registers not used by kernel, leave zero */
> 
> --
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