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Dale wrote:
> Stroller wrote:
>> On 2 Feb 2009, at 03:46, Dale wrote:
>>>> ...
>>>> I think I tried this &/or genkernel & when I looked at /boot I found
>>>> they'd littered the place with clutter.
>>>>
>>>> I hope you won't be offended, but the amount of junk files this added
>>>> made me want to barf.
>>>>
>>>> I have avoided any such "complications" since, considering I don't
>>>> consider copying a file & editing grub.conf to be anything of a
>>>> complication myself.
>>>> ...
>>> I think I read somewhere that system.map file is no longer needed,
>>> unless you want to set up things in a "odd" way.  Is that correct?
>> I've certainly never needed it, in several years since 2.4 kernels.
>> But IIRC it is/was copied over when using these "automated kernel
>> installation methods".
>>
>> Stroller.
>>  
> 
> I think that is how mine got there to.  I may rename mine and reboot and
> see what blows up. 
> 
> Dale
> 
> :-)  :-) 
> 
> 

If I remember correctly, it is only used by depmod, and only if you pass
the file name on the command line. update-modules, which calls depmod,
and tends to be the main way that depmod is called (besides in the
kernel Makefile), searches the following directories for the System.map
file:
  /lib/modules/${KV}/build
  /usr/src/linux-${KV}
  /lib/modules/${KV}
  /boot
  /usr/src/linux

In each directory, it looks for the file in this order:
  System.map-genkernel-${arch}-${KV}
  System.map-genkernel-*-${KV}
  System.map-${KV}
  System.map

What this effectively means is that the copy in /boot is a backup copy,
just in case you clean the current build of your kernel
(/lib/modules/${KV}/build is a symlink to the build directory of your
kernel build, which can differ from the source directory)

tl;dr version: It won't blow up immediately, but you might run into
problems later if you `make clean` or `make mrproper` in the build tree
- - or build a different kernel in the same tree.

- --
ABCD
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