2.6.6-rc2 addition warnings with gcc-3.4.0 and some timing results.

[Steven Cole]

I built the current 2.6.6-rc2 tree recently pulled from
bk://linus.bkbits.net/linux-2.5 using both gcc-3.3.2 as shipped with
Mandrake 10, and with the recent release of gcc-3.4.0, which was built
with all the defaults for an i686 system.

The builds were performed in two separate directories, each made with
bk export -tplain ../dirname.

The times are for a make -j3 bzImage on a dual PIII 733 Mhz system.
Make oldconfig was run first, using the same .config in each case.
The running kernel was 2.6.6-rc2 built with gcc-3.4.0.

Gcc-3.4.0 appears to be a little faster. The kernel builds were run
several times.  The time results were consistent.

A few additional warnings were received with gcc-3.4.0.

gcc-3.3.2	688.38user 52.69system 6:13.64elapsed 198%CPU 
$ size vmlinux
   text    data     bss     dec     hex filename
3064764  360496  176584 3601844  36f5b4 vmlinux

gcc-3.4.0	599.56user 40.25system 5:23.11elapsed 198%CPU
$ size vmlinux
   text    data     bss     dec     hex filename
3005436  359728  176552 3541716  360ad4 vmlinux

Warnings only with gcc-3.4.0:

  CC      arch/i386/pci/pcbios.o
arch/i386/pci/pcbios.c: In function `pcibios_get_irq_routing_table':
arch/i386/pci/pcbios.c:424: warning: read-write constraint does not allow a register
arch/i386/pci/pcbios.c:424: warning: read-write constraint does not allow a register

  CC      fs/xfs/xfs_iget.o
include/asm/rwsem.h: In function `xfs_ilock_nowait':
include/asm/rwsem.h:126: warning: read-write constraint does not allow a register
include/asm/rwsem.h:126: warning: read-write constraint does not allow a register
include/asm/rwsem.h:126: warning: read-write constraint does not allow a register
include/asm/rwsem.h:126: warning: read-write constraint does not allow a register

Steven

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