Revision f4142cba4e4065a416e78ade905bea29ff3930e6 authored by David S. Miller on 29 September 2011, 19:18:59 UTC, committed by David S. Miller on 29 September 2011, 19:18:59 UTC
In the OF 'translations' property, the template TTEs in the mappings never specify the executable bit. This is the case even though some of these mappings are for OF's code segment. Therefore, we need to force the execute bit on in every mapping. This problem can only really trigger on Niagara/sun4v machines and the history behind this is a little complicated. Previous to sun4v, the sun4u TTE entries lacked a hardware execute permission bit. So OF didn't have to ever worry about setting anything to handle executable pages. Any valid TTE loaded into the I-TLB would be respected by the chip. But sun4v Niagara chips have a real hardware enforced executable bit in their TTEs. So it has to be set or else the I-TLB throws an instruction access exception with type code 6 (protection violation). We've been extremely fortunate to not get bitten by this in the past. The best I can tell is that the OF's mappings for it's executable code were mapped using permanent locked mappings on sun4v in the past. Therefore, the fact that we didn't have the exec bit set in the OF translations we would use did not matter in practice. Thanks to Greg Onufer for helping me track this down. Signed-off-by: David S. Miller <davem@davemloft.net>
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coccinelle | ||
dtc | ||
genksyms | ||
kconfig | ||
ksymoops | ||
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rt-tester | ||
selinux | ||
tracing | ||
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Kbuild.include | -rw-r--r-- | 10.1 KB |
Lindent | -rwxr-xr-x | 460 bytes |
Makefile | -rw-r--r-- | 1.2 KB |
Makefile.asm-generic | -rw-r--r-- | 681 bytes |
Makefile.build | -rw-r--r-- | 14.5 KB |
Makefile.clean | -rw-r--r-- | 3.2 KB |
Makefile.fwinst | -rw-r--r-- | 2.0 KB |
Makefile.headersinst | -rw-r--r-- | 3.7 KB |
Makefile.help | -rw-r--r-- | 68 bytes |
Makefile.host | -rw-r--r-- | 6.5 KB |
Makefile.lib | -rw-r--r-- | 12.0 KB |
Makefile.modbuiltin | -rw-r--r-- | 1.8 KB |
Makefile.modinst | -rw-r--r-- | 1.0 KB |
Makefile.modpost | -rw-r--r-- | 5.1 KB |
bin2c.c | -rw-r--r-- | 702 bytes |
bloat-o-meter | -rwxr-xr-x | 1.8 KB |
bootgraph.pl | -rw-r--r-- | 5.6 KB |
checkincludes.pl | -rwxr-xr-x | 1.8 KB |
checkkconfigsymbols.sh | -rwxr-xr-x | 1.8 KB |
checkpatch.pl | -rwxr-xr-x | 88.2 KB |
checkstack.pl | -rwxr-xr-x | 5.2 KB |
checksyscalls.sh | -rwxr-xr-x | 5.5 KB |
checkversion.pl | -rwxr-xr-x | 1.9 KB |
cleanfile | -rwxr-xr-x | 3.4 KB |
cleanpatch | -rwxr-xr-x | 5.0 KB |
coccicheck | -rwxr-xr-x | 2.9 KB |
config | -rwxr-xr-x | 2.8 KB |
conmakehash.c | -rw-r--r-- | 6.0 KB |
decodecode | -rwxr-xr-x | 1.9 KB |
depmod.sh | -rwxr-xr-x | 1.3 KB |
diffconfig | -rwxr-xr-x | 3.6 KB |
docproc.c | -rw-r--r-- | 14.1 KB |
export_report.pl | -rw-r--r-- | 4.5 KB |
extract-ikconfig | -rwxr-xr-x | 1.6 KB |
gcc-goto.sh | -rw-r--r-- | 224 bytes |
gcc-version.sh | -rw-r--r-- | 819 bytes |
gcc-x86_32-has-stack-protector.sh | -rw-r--r-- | 183 bytes |
gcc-x86_64-has-stack-protector.sh | -rw-r--r-- | 199 bytes |
gen_initramfs_list.sh | -rw-r--r-- | 7.4 KB |
get_maintainer.pl | -rwxr-xr-x | 53.8 KB |
gfp-translate | -rw-r--r-- | 1.7 KB |
headerdep.pl | -rwxr-xr-x | 3.5 KB |
headers.sh | -rwxr-xr-x | 530 bytes |
headers_check.pl | -rw-r--r-- | 2.7 KB |
headers_install.pl | -rw-r--r-- | 1.8 KB |
kallsyms.c | -rw-r--r-- | 15.2 KB |
kernel-doc | -rwxr-xr-x | 62.3 KB |
makelst | -rwxr-xr-x | 773 bytes |
markup_oops.pl | -rw-r--r-- | 8.1 KB |
mkcompile_h | -rwxr-xr-x | 2.5 KB |
mkmakefile | -rw-r--r-- | 1.2 KB |
mksysmap | -rw-r--r-- | 1.3 KB |
mkuboot.sh | -rwxr-xr-x | 379 bytes |
mkversion | -rw-r--r-- | 74 bytes |
module-common.lds | -rw-r--r-- | 737 bytes |
namespace.pl | -rwxr-xr-x | 13.0 KB |
patch-kernel | -rwxr-xr-x | 9.8 KB |
pnmtologo.c | -rw-r--r-- | 11.7 KB |
profile2linkerlist.pl | -rw-r--r-- | 375 bytes |
recordmcount.c | -rw-r--r-- | 11.9 KB |
recordmcount.h | -rw-r--r-- | 16.3 KB |
recordmcount.pl | -rwxr-xr-x | 17.5 KB |
setlocalversion | -rwxr-xr-x | 3.9 KB |
show_delta | -rwxr-xr-x | 3.0 KB |
tags.sh | -rwxr-xr-x | 4.9 KB |
unifdef.c | -rw-r--r-- | 34.8 KB |
ver_linux | -rwxr-xr-x | 3.1 KB |
xz_wrap.sh | -rw-r--r-- | 559 bytes |
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