On Tue, Sep 11, 2012 at 10:49:39PM +0800, Fengguang Wu wrote: > On Tue, Sep 11, 2012 at 05:29:26PM +0300, Dan Carpenter wrote: > > On Tue, Sep 11, 2012 at 07:06:40PM +0800, Fengguang Wu wrote: > > > On Tue, Sep 11, 2012 at 01:51:27PM +0300, Dan Carpenter wrote: > > > > > > $SMATCH -p kernel "$@" > $SMATCH_OUT_ROOT/$PPID-$$-$RANDOM > > FYI, the wrapper script is as simple as > > SMATCH=/c/smatch/smatch > $SMATCH -p kernel "$@" > $SMATCH_OUT_ROOT/$PPID-$$-$RANDOM > > > Some of the warnings you are getting seem to mean that you're not > > picking up the smatch_data/ directory. For example some of the > > buffer overflow errors: > > > > drivers/mtd/ubi/wl.c:336 prot_queue_add() warn: buffer overflow 'ubi->pq' 10 <= 10 > > > > What is happening in that function is that Smatch sees the: > > ubi_assert(pq_tail >= 0 && pq_tail < UBI_PROT_QUEUE_LEN); > > > > and assumes that since there is a test for > > "pq_tail < UBI_PROT_QUEUE_LEN" then it must be possible for > > pq_tail == UBI_PROT_QUEUE_LEN. There is a file called: > > smatch_data/kernel.ignored_macros which has ubi_assert() and it > > means to ignore everything that happens inside a ubi_assert(). > > Yes, I can see the data and function. Thank you very much for the tips! > > > Normally Smatch looks for the data dir with the binary, but you can > > also specify a directory with --data=/path/to/smatch_data/. Then > > The directory layout here is > > /c/smatch/ # git tree > /c/smatch/smatch # binary > /c/smatch/smatch_data/ # kernel.* data > > > you can test that it's working by doing a: > > kchecker drivers/mtd/ubi/wl.c > > to verify that the warning goes away. > > Both of these two tests run well w/o the above warning: > > /c/smatch/smatch_scripts/kchecker drivers/mtd/ubi/wl.c > > make C=1 CHECK=/c/kernel-tests/smatchcheck drivers/mtd/ubi/wl.o > > This is interesting. I'll try adding --data=/c/smatch/smatch_data and > check whether the end result becomes better. It works now, after changing '-p kernel' to '--project=kernel'. Next step would be to regenerate the smatch_data/ contents for each new branch to make it work more reliably. Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
