On Mon, Nov 22, 2010 at 12:42:32PM +0000, Alexander Leidinger wrote: > Author: netchild > Date: Mon Nov 22 12:42:32 2010 > New Revision: 215675 > URL: http://svn.freebsd.org/changeset/base/215675 > > Log: > Do not take the process lock. The assignment to u_short inside the > properly aligned structure is atomic on all supported architectures, and > the thread that should see side-effect of assignment is the same thread > that does assignment. > > Use a more appropriate conditional to detect the linux ABI. > > Suggested by: kib > X-MFC: together with r215664 > > Modified: > head/sys/compat/linux/linux_emul.c > > Modified: head/sys/compat/linux/linux_emul.c > ============================================================================== > --- head/sys/compat/linux/linux_emul.c Mon Nov 22 12:33:48 2010 > (r215674) > +++ head/sys/compat/linux/linux_emul.c Mon Nov 22 12:42:32 2010 > (r215675) > @@ -265,7 +262,8 @@ linux_proc_exec(void *arg __unused, stru > if (__predict_false(imgp->sysent == &elf_linux_sysvec > && p->p_sysent != &elf_linux_sysvec)) > linux_proc_init(FIRST_THREAD_IN_PROC(p), p->p_pid, 0); > - if (__predict_false(p->p_sysent == &elf_linux_sysvec)) > + if (__predict_false((p->p_sysent->sv_flags & SV_ABI_MASK) == > + SV_ABI_LINUX)) > /* Kill threads regardless of imgp->sysent value */ > linux_kill_threads(FIRST_THREAD_IN_PROC(p), SIGKILL); > if (__predict_false(imgp->sysent != &elf_linux_sysvec There are several similar comparisons around the patched one.
I am still quite curious for the reason of all __predict() obfuscations that are countless in the linuxolator. We are not oblidged to emulate this aspect of Linux.
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