insmod search_exception_table !!!

Matt Porter porter at
Wed Apr 9 07:56:45 EST 2003

On Tue, Apr 08, 2003 at 10:08:35PM +0530, invictus rm wrote:
> Hi Matt,
> I am using io_block_mapping for early_console_prints
>     io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
> Is this a cause of the problem ??

Not on its should have ~240MB of initial vmalloc space with
this configuration.

> How do i know how much addr i have ioremapped ??

You really want to know how much vmalloc space has been consumed
by all users.

Hard way:

Count all the ioremaps you do (plus 4KB offset between each
vmalloc offset).  If you are on a non-coherent platform you also
have to consider all consistent alloced memory.

Easy way:
/proc/meminfo contains vmalloc usage stats.

> My PAGE_OFFSET is at 0xc0000000
> Do i need to change the PCI MEM Map also if i am having a 1:1 mapping in the
> kernel virtual space ??

No, you just need to be aware that VMALLOC_END=ioremap_bot and this
value is set to whatever your lowest io_block_map virtual address is.
Any early ioremaps (pre-MM initialized) you do to place system devices
will further drop VMALLOC_END and constrain your vmalloc space.

Matt Porter
porter at
This is Linux Country. On a quiet night, you can hear Windows reboot.

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