Date: Mon, 19 Jun 2017 20:40:59 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r320121 - head/sys/vm Message-ID: <201706192040.v5JKex7I032901@repo.freebsd.org>
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Author: kib Date: Mon Jun 19 20:40:59 2017 New Revision: 320121 URL: https://svnweb.freebsd.org/changeset/base/320121 Log: Ignore the P_SYSTEM process flag, and do not request VM_MAP_WIRE_SYSTEM mode when wiring the newly grown stack. System maps do not create auto-grown stack. Any stack we handled, even for P_SYSTEM, must be for user address space. P_SYSTEM processes with mapped user space is either init(8) or an aio worker attached to other user process with aio buffer pointing into stack area. In either case, VM_MAP_WIRE_USER mode should be used. Noted and reviewed by: alc Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/vm/vm_map.c Modified: head/sys/vm/vm_map.c ============================================================================== --- head/sys/vm/vm_map.c Mon Jun 19 19:27:37 2017 (r320120) +++ head/sys/vm/vm_map.c Mon Jun 19 20:40:59 2017 (r320121) @@ -3891,9 +3891,7 @@ Retry: vm_map_wire(map, (stack_entry == next_entry) ? addr : addr - grow_amount, (stack_entry == next_entry) ? stack_entry->start : addr, - (p->p_flag & P_SYSTEM) - ? VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES - : VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); + VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); } out:
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