powerpc/8xx: Use L1 entry APG to handle _PAGE_ACCESSED for CONFIG_SWAP
authorChristophe Leroy <christophe.leroy@c-s.fr>
Fri, 12 Jan 2018 12:45:33 +0000 (13:45 +0100)
committerMichael Ellerman <mpe@ellerman.id.au>
Tue, 16 Jan 2018 12:47:15 +0000 (23:47 +1100)
commit4f94b2c7462d9720b2afa7e8e8d4c19446bb31ce
tree1ae3d8ccd4182022f85041802d199b1294699639
parentde0f93873937e999fadaba011d368bc042af37b2
powerpc/8xx: Use L1 entry APG to handle _PAGE_ACCESSED for CONFIG_SWAP

When CONFIG_SWAP is set, the TLB miss handlers have to also take
into account _PAGE_ACCESSED flag. At the moment it is done by
anding _PAGE_ACCESSED into _PAGE_PRESENT using 3 instructions.

This patch uses APG for handling _PAGE_ACCESSED, allowing to
just copy _PAGE_ACCESSED bit into APG field, hence reducing the
action to a single instruction.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/include/asm/mmu-8xx.h
arch/powerpc/kernel/head_8xx.S
arch/powerpc/mm/8xx_mmu.c