CONFIG_HIGHMEM64G=y for x86_64 SMP kernels

[Ed Hill <ed eh3 com>]

Hi folks,

I've been using FC2 and devel kernels for one of our dual-Opteron
systems and am very happy with recent improvements.  Everything works
well for us including:

  - AMD IDE interface
  - tg3 driver (dual Broadcom BCM5704 GigE)
  - 3w_9xxx driver (8-port 3ware SATA card)

The only request I have is that the following be added to the x86_64-SMP
kernel config:

  CONFIG_HIGHMEM=y
  CONFIG_HIGHMEM64G=y

I've been building custom kernels based on the testing SRPMs with just
this one small change and (for us at least) it works well on:

  kernel-2.6.7-1.494
  kernel-2.6.8-1.524
  kernel-2.6.8-1.533

Would it be possible to make "CONFIG_HIGHMEM64G=y" the default for SMP
x86_64 kernels?  I bow to the kernel experts, but it does appear to be a
reasonable default given the likelihood of SMP Opterons having more than
4Gig RAM.

And I'll gladly add this to bugzilla if someone will recommend the best
topic for it.

Ed

-- 
Edward H. Hill III, PhD
office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
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