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Revision 494e5b6faeda1d1e830a13e10b3c7bc323f35d97 authored by Khalid Aziz on 27 May 2015, 16:00:46 UTC, committed by David S. Miller on 01 June 2015, 05:15:01 UTC 
sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE
 
sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE

Bit 9 of TTE is CV (Cacheable in V-cache) on sparc v9 processor while
the same bit 9 is MCDE (Memory Corruption Detection Enable) on M7
processor. This creates a conflicting usage of the same bit. Kernel
sets TTE.cv bit on all pages for sun4v architecture which works well
for sparc v9 but enables memory corruption detection on M7 processor
which is not the intent. This patch adds code to determine if kernel
is running on M7 processor and takes steps to not enable memory
corruption detection in TTE erroneously.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent f0c1a11
Raw File
bloat-o-meter 
#!/usr/bin/python
#
# Copyright 2004 Matt Mackall <mpm@selenic.com>
#
# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import sys, os, re

if len(sys.argv) != 3:
    sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
    sys.exit(-1)

def getsizes(file):
    sym = {}
    for l in os.popen("nm --size-sort " + file).readlines():
        size, type, name = l[:-1].split()
        if type in "tTdDbBrR":
            # strip generated symbols
            if name.startswith("__mod_"): continue
            if name.startswith("SyS_"): continue
            if name.startswith("compat_SyS_"): continue
            if name == "linux_banner": continue
            # statics and some other optimizations adds random .NUMBER
            name = re.sub(r'\.[0-9]+', '', name)
            sym[name] = sym.get(name, 0) + int(size, 16)
    return sym

old = getsizes(sys.argv[1])
new = getsizes(sys.argv[2])
grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
delta, common = [], {}

for a in old:
    if a in new:
        common[a] = 1

for name in old:
    if name not in common:
        remove += 1
        down += old[name]
        delta.append((-old[name], name))

for name in new:
    if name not in common:
        add += 1
        up += new[name]
        delta.append((new[name], name))

for name in common:
        d = new.get(name, 0) - old.get(name, 0)
        if d>0: grow, up = grow+1, up+d
        if d<0: shrink, down = shrink+1, down-d
        delta.append((d, name))

delta.sort()
delta.reverse()

print "add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
      (add, remove, grow, shrink, up, -down, up-down)
print "%-40s %7s %7s %+7s" % ("function", "old", "new", "delta")
for d, n in delta:
    if d: print "%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)
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