Date: Tue, 23 Aug 2016 16:12:25 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r304687 - head/sys/arm64/arm64 Message-ID: <201608231612.u7NGCPi3052791@repo.freebsd.org>
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Author: andrew Date: Tue Aug 23 16:12:25 2016 New Revision: 304687 URL: https://svnweb.freebsd.org/changeset/base/304687 Log: If we find we have a superpage in pmap_enter_quick_locked return without trying to add a new level 3 page. Obtained from: ABT Systems Ltd MFC after: 1 month Sponsored by: The FreeBSD Foundation Modified: head/sys/arm64/arm64/pmap.c Modified: head/sys/arm64/arm64/pmap.c ============================================================================== --- head/sys/arm64/arm64/pmap.c Tue Aug 23 15:49:31 2016 (r304686) +++ head/sys/arm64/arm64/pmap.c Tue Aug 23 16:12:25 2016 (r304687) @@ -2696,7 +2696,7 @@ pmap_enter_quick_locked(pmap_t pmap, vm_ { struct spglist free; pd_entry_t *pde; - pt_entry_t *l3; + pt_entry_t *l2, *l3; vm_paddr_t pa; int lvl; @@ -2731,6 +2731,12 @@ pmap_enter_quick_locked(pmap_t pmap, vm_ * attempt to allocate a page table page. If this * attempt fails, we don't retry. Instead, we give up. */ + if (lvl == 1) { + l2 = pmap_l1_to_l2(pde, va); + if ((pmap_load(l2) & ATTR_DESCR_MASK) == + L2_BLOCK) + return (NULL); + } if (lvl == 2 && pmap_load(pde) != 0) { mpte = PHYS_TO_VM_PAGE(pmap_load(pde) & ~ATTR_MASK);
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