Date: Mon, 1 Dec 2003 17:54:05 -0500 (EST) From: Jeff Roberson <jroberson@chesapeake.net> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: RE: cvs commit: src/sys/alpha/alpha mp_machdep.c Message-ID: <20031201175237.S4201-100000@mail.chesapeake.net> In-Reply-To: <XFMail.20031201173215.jhb@FreeBSD.org>
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On Mon, 1 Dec 2003, John Baldwin wrote: > > On 01-Dec-2003 Jeff Roberson wrote: > > On Mon, 1 Dec 2003, John Baldwin wrote: > > > >> > >> On 30-Nov-2003 Jeff Roberson wrote: > >> > jeff 2003/11/30 14:08:24 PST > >> > > >> > FreeBSD src repository > >> > > >> > Modified files: > >> > sys/alpha/alpha mp_machdep.c > >> > Log: > >> > - Set mp_maxid in a way that is consistent with every other arch. It is > >> > one more than the last valid 'cpuid'. > >> > > >> > Approved by: re (rwatson) > >> > >> Eh? No it's not. All that needs to be true is that for every processor, > >> PCPU_GET(cpuid) <= mp_maxid. > >> > >> It can be equal to the highest ID and should be so for most cases. > > > > From x86's mp_machdep: > > mp_maxid = MAXCPU; > > That's a bug. > > > ia64 > > mp_maxid = min(mp_ncpus, MAXCPU) - 1; > > This is correct. Note - 1. > > > sparc64 > > cpus = 0; > > root = OF_peer(0); > > for (child = OF_child(root); child != 0; child = OF_peer(child)) { > > if (OF_getprop(child, "device_type", buf, sizeof(buf)) > 0 > > && > > strcmp(buf, "cpu") == 0) > > cpus++; > > } > > mp_maxid = cpus; > > This should be cpus - 1. > > > And I just changed amd64 and alpha to mean maxid + 1. Damn. it looks like > > just sparc64 and x86 were wrong. Maybe I should change those to mean the > > right thing, and backout the changes to uma. yack. > > Heh. I am already waiting for approval from re@ to fix x86. That was > definitely my bug. Well, since ULE and UMA are the only two subsystems which make use of mp_maxid, can I request that it be one over the maximum id so that I can use it in loops like: for (i = 0; i < mp_maxid; i++) { Otherwise I guess I can do <=. If you fix x86, can you fix alpha and amd64, and uma and ule? :-) > > -- > > John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ > "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ >
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