what does this do ?

[horseriver]

On Mon, Jan 14, 2013 at 07:20:46AM -0800, Ramesh.P wrote:
> Hi,
> 
> 
> On Sun, Jan 13, 2013 at 8:50 PM, horseriver <horserivers at gmail.com> wrote:
> 
> > On Sun, Jan 13, 2013 at 09:27:45PM -0800, Dave Hylands wrote:
> > > Hi,
> > >
> > > On Sun, Jan 13, 2013 at 11:29 AM, horseriver <horserivers at gmail.com>
> > wrote:
> > > >
> > > > hi:
> > > >
> > > >   In kernel code . some function is defined  by
> > >  __attribute__((__section__(".initcall" level ".init")))
> > > >
> > > >   what does this do ?
> > >
> > > It puts the address of the function in a linker section named
> > > .initcallX.init where X is replaced by the level.
> > >
> > > These functions are called in order to initialize various subsystems and
> > > drivers during kernel bootup.
> >
> >   Thanks!
> >
> >   Another question:
> >
> >   __attribute__((regparm(3)))    ;  what does this do ?
> >

  Thank You!

   what the use of doing like this ?  why  tell gcc  to  pass param like this ?

 
> >
> It causes the compiler to pass the argument (3 in this case) to be passed
> in registers (like EAX, ECX and EDX) instead of stack.
> 
> Thanks,
> Ramesh
> 
> 
> >
> >
> >
> > > --
> > > Dave Hylands
> > > Shuswap, BC, Canada
> > > http://www.davehylands.com
> >
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> >