Subject: [PATCH 0/9] Reduce PACA save areas

From: Nicholas Piggin <[email-masked]>
Date: Sun, 21 May 2017 23:15:41 +1000

I want to save another register in the PACA, so I had a look at
what we might cut from it first. 3-4 fields are reasonably easy
to remove.

Nicholas Piggin (9):
  powerpc/64s: slb_allocate_realmode() preserve r3
  powerpc/64s: SLB miss handler avoid saving faulting address into
    EX_DAR
  powerpc/64s: SLB miss already has CTR saved for relocatable kernel
  powerpc/64s: SLB miss handler avoid r3 save/restore
  powerpc/64s: paca add EX_SIZE definition for exception save areas
  powerpc/64s: paca EX_SRR0 is unused, remove it
  powerpc/64s: paca EX_LR can be merged with EX_DAR
  powerpc/64s: paca EX_R3 can be merged with EX_DAR
  powerpc/64s: paca EX_CTR is not used with !RELOCATABLE, remove it

 arch/powerpc/include/asm/exception-64s.h | 53 ++++++++++++++++++++++---------
 arch/powerpc/include/asm/paca.h          | 12 ++++---
 arch/powerpc/kernel/exceptions-64s.S     | 54 +++++++++++++++++---------------
 arch/powerpc/mm/slb_low.S                | 24 ++++++++------
 4 files changed, 88 insertions(+), 55 deletions(-)

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2.11.0