linux-kernel - Re: [PATCH v3 3/4] powerpc/64: make buildable without CONFIG

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Date:   Thu, 29 Aug 2019 10:01:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Michal Suchanek <msuchanek@...e.de>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Howells <dhowells@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Breno Leitao <leitao@...ian.org>,
        Michael Neuling <mikey@...ling.org>,
        Nicolai Stange <nstange@...e.de>,
        Allison Randal <allison@...utok.net>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Joel Stanley <joel@....id.au>,
        Firoz Khan <firoz.khan@...aro.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christian Brauner <christian@...uner.io>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>
Subject: Re: [PATCH v3 3/4] powerpc/64: make buildable without CONFIG_COMPAT

On Thu, Aug 29, 2019 at 8:46 AM Christoph Hellwig <hch@...radead.org> wrote:

> > @@ -277,7 +277,7 @@ static void do_signal(struct task_struct *tsk)
> >
> >       rseq_signal_deliver(&ksig, tsk->thread.regs);
> >
> > -     if (is32) {
> > +     if ((IS_ENABLED(CONFIG_PPC32) || IS_ENABLED(CONFIG_COMPAT)) && is32) {
>
> I think we should fix the is_32bit_task definitions instead so that
> callers don't need this mess.  I'd suggest something like:
>
> #ifdef CONFIG_COMPAT
> #define is_32bit_task()         test_thread_flag(TIF_32BIT)
> #else
> #define is_32bit_task()         IS_ENABLED(CONFIG_PPC32)
> #endif

Are there actually any (correct) uses of is_32bit_task() outside of
#ifdef CONFIG_PPC64?

I suspect most if not all could be changed to the generic
in_compat_syscall() that we use outside of architecture specific
code.

       Arnd