smatch 1.53 released

[Dan Carpenter]

Smatch is a source code checker for C.  Right now the focus is on checking 
for kernel bugs.

Here is are the instructions for installing and using:
    git clone git://repo.or.cz/smatch.git
    cd smatch
    make
    cd /usr/src/linux
    make C=1 CHECK=/path/to/smatch modules bzImage | tee warns.txt 
    egrep '(warn|error):' warns.txt

Some weeks ago I pushed a bad commit.  I haven't had internet access to 
fix it until now.  Sorry about that.  It's fixed now.

Smatch v1.53 improves handling of compound implications.  So if you have 
code like this:
        aaa = 0;
        if (y)
                aaa = 1;
        if (x)
                aaa = 2;
        if (x && y)
                __smatch_print_value("aaa");  // <-- prints aaa == 2
        else
                __smatch_print_value("aaa");  // <-- prints aaa == 0-2

This version also adds implications for switch statements.
        if (!a && x != 42)
                return;
        switch(x) {
        case 1:
                a->member = 1;  // <--  It's ok to dereference 'a' here.
        case 42:
                a->member = 1;  // <-- smatch prints an error here.

regards,
dan carpenter
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