Re: [GIT PULL] siginfo: ABI fixes for v5.13-rc2

[Linus Torvalds]

On Thu, May 13, 2021 at 9:55 PM Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>
> Please pull the for-v5.13-rc2 branch from the git tree:

I really don't like this tree.

The immediate cause for "no" is the silly

 #if IS_ENABLED(CONFIG_SPARC)

and

 #if IS_ENABLED(CONFIG_ALPHA)

code in kernel/signal.c. It has absolutely zero business being there,
when those architectures have a perfectly fine arch/*/kernel/signal.c
file where that code would make much more sense *WITHOUT* any odd
preprocessor games.

But there are other oddities too, like the new

    send_sig_fault_trapno(SIGFPE, si_code, (void __user *) regs->pc,
0, current);

in the alpha code, which fundamentally seems bogus: using
send_sig_fault_trapno() with a '0' for trapno seems entirely
incorrect, since the *ONLY* point of that function is to set si_trapno
to something non-zero.

So it would seem that a plain send_sig_fault() without that 0 would be
the right thing to do.

This also mixes in a lot of other stuff than just the fixes. Which
would have been ok during the merge window, but I'm definitely not
happy about it now.

             Linus