linux-kernel - Re: [RFC PATCH v3 15/15] powerpc/kernel: Do not inconditionally save non volatile registers on system call

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Message-Id: <1586221719.pt68ef9jgc.astroid@bobo.none>
Date:   Tue, 07 Apr 2020 11:10:54 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Michael Ellerman <mpe@...erman.id.au>, msuchanek@...e.de,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v3 15/15] powerpc/kernel: Do not inconditionally save
 non volatile registers on system call

Christophe Leroy's on April 7, 2020 4:16 am:
> +	ret = syscall_exit_prepare_end(ret, regs, ti_flags);
> +	if (unlikely(ret & 0x80000000)) {
> +		ret &= ~0x80000000;

We could just add our own set of defines for these, there's no real
reason to use _TIF_RESTOREALL as I had.

Thanks,
Nick