Date: Tue, 8 Oct 2019 14:54:35 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353306 - head/sys/riscv/riscv Message-ID: <201910081454.x98EsZDS048623@repo.freebsd.org>
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Author: markj Date: Tue Oct 8 14:54:35 2019 New Revision: 353306 URL: https://svnweb.freebsd.org/changeset/base/353306 Log: Clear PGA_WRITEABLE in riscv's pmap_remove_l3(). pmap_remove_l3() may remove the last mapping of a page, in which case it must clear PGA_WRITEABLE. Reported by: Jenkins, via lwhsu MFC after: 1 week Sponsored by: The FreeBSD Foundation Modified: head/sys/riscv/riscv/pmap.c Modified: head/sys/riscv/riscv/pmap.c ============================================================================== --- head/sys/riscv/riscv/pmap.c Tue Oct 8 13:43:05 2019 (r353305) +++ head/sys/riscv/riscv/pmap.c Tue Oct 8 14:54:35 2019 (r353306) @@ -2085,6 +2085,7 @@ static int pmap_remove_l3(pmap_t pmap, pt_entry_t *l3, vm_offset_t va, pd_entry_t l2e, struct spglist *free, struct rwlock **lockp) { + struct md_page *pvh; pt_entry_t old_l3; vm_paddr_t phys; vm_page_t m; @@ -2104,6 +2105,12 @@ pmap_remove_l3(pmap_t pmap, pt_entry_t *l3, vm_offset_ vm_page_aflag_set(m, PGA_REFERENCED); CHANGE_PV_LIST_LOCK_TO_VM_PAGE(lockp, m); pmap_pvh_free(&m->md, pmap, va); + if (TAILQ_EMPTY(&m->md.pv_list) && + (m->flags & PG_FICTITIOUS) == 0) { + pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); + if (TAILQ_EMPTY(&pvh->pv_list)) + vm_page_aflag_clear(m, PGA_WRITEABLE); + } } return (pmap_unuse_pt(pmap, va, l2e, free));
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