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Message-ID: <20060326174556.45649.qmail@web32404.mail.mud.yahoo.com>
Date: Sun, 26 Mar 2006 09:45:56 -0800 (PST)
From: Anil kumar <anils_r@yahoo.com>
Subject: kernel BUG at arch/i386/mm/highmem.c:63! kunmap_atomic
To: linux-kernel@vger.kernel.org
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Hi,

I get the following kernel panic,

kernel BUG at arch/i386/mm/highmem.c:63!
EIP:    0060:[<c011af5a>]    Tainted: PF     VLI
EFLAGS: 00010006   (2.6.11-1.1369_FC4smp)
EIP is at kunmap_atomic+0x35/0x5f

The following is the code, I am using in my driver:

kmap_atomic code:

int hr_km_type = (in_interrupt())? KM_IRQ0: KM_USER0;
         pDataBuffer = kmap_atomic(cur_seg->page,
hr_km_type) + cur_seg->offset;
         if(pDataBuffer == NULL) {
            return (ENOMEM);
         }

kunmap_atomic code:

int hr_km_type = (in_interrupt())? KM_IRQ0: KM_USER0;
                  kunmap_atomic(pDataBuffer -
sg->offset, hr_km_type);

I am not using any locks like irq_disable/restore
before and after calling kmap_atomic/kunmap_atomic.

The system has 1GB memory.

with regards,
   Anil

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