Date: Sun, 19 Apr 2009 00:34:34 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r191256 - head/sys/vm Message-ID: <200904190034.n3J0YYTG091443@svn.freebsd.org>
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Author: alc Date: Sun Apr 19 00:34:34 2009 New Revision: 191256 URL: http://svn.freebsd.org/changeset/base/191256 Log: Allow valid pages to be mapped for read access when they have a non-zero busy count. Only mappings that allow write access should be prevented by a non-zero busy count. (The prohibition on mapping pages for read access when they have a non- zero busy count originated in revision 1.202 of i386/i386/pmap.c when this code was a part of the pmap.) Reviewed by: tegge Modified: head/sys/vm/vm_fault.c head/sys/vm/vm_map.c Modified: head/sys/vm/vm_fault.c ============================================================================== --- head/sys/vm/vm_fault.c Sun Apr 19 00:16:04 2009 (r191255) +++ head/sys/vm/vm_fault.c Sun Apr 19 00:34:34 2009 (r191256) @@ -1027,7 +1027,6 @@ vm_fault_prefault(pmap_t pmap, vm_offset break; } if (((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) && - (m->busy == 0) && (m->flags & PG_FICTITIOUS) == 0) { vm_page_lock_queues(); Modified: head/sys/vm/vm_map.c ============================================================================== --- head/sys/vm/vm_map.c Sun Apr 19 00:16:04 2009 (r191255) +++ head/sys/vm/vm_map.c Sun Apr 19 00:34:34 2009 (r191256) @@ -1683,8 +1683,7 @@ vm_map_pmap_enter(vm_map_t map, vm_offse psize = tmpidx; break; } - if ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL && - (p->busy == 0)) { + if ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) { if (p_start == NULL) { start = addr + ptoa(tmpidx); p_start = p;
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