Messages in this thread | | | Subject | Re: [patch] i386: use C code for current_thread_info() | From | Andi Kleen <> | Date | 12 Jun 2006 10:10:09 +0200 |
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Alistair John Strachan <s0348365@sms.ed.ac.uk> writes:
> On Sunday 11 June 2006 20:42, Jan Engelhardt wrote: > > >Using C code for current_thread_info() lets the compiler optimize it. > > >With gcc 4.0.2, kernel is smaller: > > > > > > text data bss dec hex filename > > > 3645212 555556 312024 4512792 44dc18 2.6.17-rc6-nb-post/vmlinux > > > 3647276 555556 312024 4514856 44e428 2.6.17-rc6-nb/vmlinux > > > ------- > > > -2064 > > > > If possible, can you or someone post the results for x86_64? > > Patch is for i386, x86_64's current_thread_info() is already C.
Actually read_pda() is inline assembly. But so far gcc/binutils don't support %gs references in the way the kernel needs it directly, so it has to stay this way.
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