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Re: Linux "NULL pointer dereferece" in the News...



On Sunday 19 July 2009, Rahul Sundaram wrote:
>On 07/19/2009 11:31 PM, Tom Horsley wrote:
>> On Sun, 19 Jul 2009 23:11:52 +0530
>>
>> Rahul Sundaram wrote:
>>> It is not so simple. This is not a compiler bug. I suggest you read
>>> through http://lwn.net/Articles/341773/rss to understand why.
>>
>> I did. It is a compiler bug no matter what a bunch of language lawyer
>> holier than thou compiler developers say :-).
>
>The kernel developers claim it is a kernel bug and the compiler
>developers claim it is not their bug and this everybody agrees with and
>yet you don't agree with all of them? Who is being holier than thou here?
>
>Kernel first dereferences a pointer, and after that checks whether it's
>NULL.  It is quite common as a compiler optimization to compile out code
>like this.
>
>Rahul

Ok, so what is the option to pass to the compiler to tell it not to do this?

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