| business_kid |
01-19-2017 12:18 PM |
Kernel Static Analyzers Spewing errors
I have Slackware-14.2, the Slackware-14.2 kernel source, which is unmodified Linus' tree, and I'm having symbol issues building external modules for virtualbox. Everything has been reinstalled, entire system & kernel upgraded, but the same problems persist.
I want to know: Is my box a mess, or is the kernel a mess?
I tried the kernel Static Analysers and got crazy results. 'make help' lists the static analysers as
Code:
Static analysers
checkstack - Generate a list of stack hogs
namespacecheck - Name space analysis on compiled kernel
versioncheck - Sanity check on version.h usage
includecheck - Check for duplicate included header files
export_report - List the usages of all exported symbols
headers_check - Sanity check on exported headers
headerdep - Detect inclusion cycles in headers
coccicheck - Check with Coccinelle.
From the kernel source I ran each one of those static analysers in the format
Code:
make checkstack 2 > checkstack.err 1 > /dev/null
That catches errors, and dumps non erroneous output to the WOM (Write Only Memory :-). I won't drown you in detail, but look at the SIZE of these .err files which are error messages
Code:
bash-4.3# ls -lh *.err
-rw-r--r-- 1 root root 0 Jan 19 16:36 checkstack.err
-rw-r--r-- 1 root root 19K Jan 19 16:37 export_report.err
-rw-r--r-- 1 root root 0 Jan 19 16:38 headerdep.err
-rw-r--r-- 1 root root 20K Jan 19 15:28 includecheck.err
-rw-r--r-- 1 root root 141K Jan 19 17:51 namespacecheck.err
-rw-r--r-- 1 root root 0 Jan 19 17:53 versioncheck.err
make headerdep actually is the worst performer, although it doesn't show there. The output is in this format
Code:
./include/acpi/acpi.h:63: warning: recursive header inclusion
In file included from linux/mmzone.h,
from linux/memory_hotplug.h:4
from linux/mmzone.h:735 <-- here
from linux/topology.h:32
from linux/gfp.h:8
from linux/percpu-refcount.h:52
from linux/cgroup-defs.h:16
from linux/sched.h:61
from linux/kasan.h:16
from linux/slab.h:107
from acpi/platform/aclinux.h:82
from acpi/platform/acenv.h:174
There are 1342 instances of the word 'here' but they're in /dev/null, and I hardly be thanked for pasting them. Make headerdep produces ~1MB of output. The code to get this figure was
Code:
make headerdep |grep -c here
BTW, I don't have Coccinelle installed, so that check is pointless.
Any ideas or comparisons welcome. |
