linux-kernel - [Fwd: kmap problem]

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Message-ID: <49D9E736.1060104@einfochips.com>
Date:	Mon, 06 Apr 2009 16:57:50 +0530
From:	Viral Mehta <viral.mehta@...fochips.com>
To:	linux-kernel@...r.kernel.org
Subject: [Fwd: kmap problem]

Hi All,
I am writing a kernel module. And I am facing a problem relate to Kmap.

I am retriving Kernel Virtual Address for a specific Page using kmap() 
and then after some time I am doing kunmap().
Now, I know that kmap can give A LIMITED NUMBER OF MAPPINGS and so such 
mapping should NOT be held longer. But in my case it is absolutely 
necessary to hold more than 1024 such mappings.

The same code is NOT working on 2.6.10 kernel and IS WORKING on 2.6.18 
kernel. The system is same and there are two kernels that I am playing 
with.

My only question is what is so changed in 2.6.18 kernel from 2.6.10 that 
the same code is working and evidently kmap can hold more than 1024 
virtual address mappings.

The other thing I would like to know if there is ANY generic way to 
handle this situation in 2.6.10 kernel.

Thanks,
Viral
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