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powerpc/8xx: remove unused _PAGE_WRITETHRU

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_PAGE_WRITETHRU is only used in:
* AMIGA_Z2RAM block driver which is never activated on powerPC
* Video/FB driver which is for PPC_PMAC

Therefore, no need to spend time in 8xx TLB miss handlers for
handling it.

And by removing it, we free up bit 20 which then avoids having
to clear it on each TLB miss.

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 13:45:25 +01:00
committed by Michael Ellerman
parent cd99ddbea2
commit 5f356497c3
3 changed files with 3 additions and 7 deletions
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2
arch/powerpc/include/asm/nohash/pgtable.h
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@@ -235,8 +235,10 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long addre
#define pgprot_cached(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
_PAGE_COHERENT))
#if _PAGE_WRITETHRU != 0
#define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
_PAGE_COHERENT | _PAGE_WRITETHRU))
#endif
#define pgprot_cached_noncoherent(prot) \
(__pgprot(pgprot_val(prot) & ~_PAGE_CACHE_CTL))