Re: Linux-2.1.98..

Bill Broadhurst (bbroad@CX492564-a.dt1.sdca.home.com)
Fri, 24 Apr 1998 20:34:53 -0700

On Fri, Apr 24, 1998 at 09:24:53PM -0500, Michael Elizabeth Chastain wrote:
> Hi guys,
>
> This is a shot in the dark:
>
> Maybe this failure in 'make dep' has something to do with the
> following code in mkdep.c, which mmaps several bytes, and maybe
> a page, *beyond* the end of the file:
>
> mapsize = st.st_size + 2*sizeof(unsigned long);
> mapsize = (mapsize+pagesizem1) & ~pagesizem1;
> map = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0);
>
> This enables the character-reading state machine to run with
> a very fast inner loop, but I don't know if mapping beyond the
> end of the file -- perhaps even into a new page -- is valid.
>

Could be. But wouldn't this mean that the lock would be at the first
encounter of this code? The locks are at different points in the make.

-bb

-- 
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  Dr. Bill Broadhurst                 | Independent contract Engineer.  
  (619)296-3710                       | BIOS, Firmware, & Diagnostics.
  bbroad@CX492564-a.dt1.sdca.home.com | Finger for PGP 5.0 public key. 
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