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powerpc/mm: extend _PAGE_PRIVILEGED to all CPUs

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commit ac29c64089 ("powerpc/mm: Replace _PAGE_USER with
_PAGE_PRIVILEGED") introduced _PAGE_PRIVILEGED for BOOK3S/64

This patch generalises _PAGE_PRIVILEGED for all CPUs, allowing
to have either _PAGE_PRIVILEGED or _PAGE_USER or both.

PPC_8xx has a _PAGE_SHARED flag which is set for and only for
all non user pages. Lets rename it _PAGE_PRIVILEGED to remove
confusion as it has nothing to do with Linux shared pages.

On BookE, there's a _PAGE_BAP_SR which has to be set for kernel
pages: defining _PAGE_PRIVILEGED as _PAGE_BAP_SR will make
this generic

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2018-01-12 13:45:27 +01:00
committed by Michael Ellerman
parent 5f356497c3
commit 812fadcb94
10 changed files with 28 additions and 54 deletions
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14
arch/powerpc/mm/pgtable_64.c
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@@ -244,20 +244,8 @@ void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
/*
* Force kernel mapping.
*/
#if defined(CONFIG_PPC_BOOK3S_64)
flags |= _PAGE_PRIVILEGED;
#else
flags &= ~_PAGE_USER;
#endif
#ifdef _PAGE_BAP_SR
/* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format
* which means that we just cleared supervisor access... oops ;-) This
* restores it
*/
flags |= _PAGE_BAP_SR;
#endif
flags |= _PAGE_PRIVILEGED;
if (ppc_md.ioremap)
return ppc_md.ioremap(addr, size, flags, caller);