Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1626333

RE: [PATCH] powerpc/32: Move entry_32 functions just after HEAD functions.

Show all headers | View raw

From: Christophe Leroy
> By default, PPC8xx PINs an ITLB on the first 8M of memory in order
> to avoid any ITLB miss on kernel code.
> However, with some debug functions like DEBUG_PAGEALLOC and
> (soon to come) DEBUG_RODATA, the PINned TLB is invalidated soon
> after startup so ITLB missed start to happen also on the kernel code.
> 
> In order to avoid any ITLB miss in a critical section, we have to
> ensure that their is no page boundary crossed between the setup of
> a new value in SRR0/SRR1 and the associated RFI. This cannot be done
> easily if entry_32 functions sits in the middle of other .text
> functions. By placing entry_32 just after the .head section (as already
> done for entry_64 on PPC64), we can more easily ensure the issue
> doesn't happen.

Shouldn't this be done by putting all the functions that 'matter'
into a named section instead of relying on the order of the input files?
(Which is what I think this is doing.)

	David

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH] powerpc/32: Move entry_32 functions just after HEAD  functions. Christophe Leroy <christophe.leroy@c-s.fr> - 2017-04-18 09:10 +0200
  RE: [PATCH] powerpc/32: Move entry_32 functions just after HEAD  functions. David Laight <David.Laight@ACULAB.COM> - 2017-04-19 17:20 +0200
    RE: [PATCH] powerpc/32: Move entry_32 functions just after HEAD functions. Michael Ellerman <mpe@ellerman.id.au> - 2017-04-20 13:30 +0200
      Re: [PATCH] powerpc/32: Move entry_32 functions just after HEAD  functions. Christophe LEROY <christophe.leroy@c-s.fr> - 2017-04-20 13:50 +0200

csiph-web