From: Oleg Nesterov <oleg@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
Ingo Molnar <mingo@kernel.org>,
Jan Kratochvil <jan.kratochvil@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Pedro Alves <palves@redhat.com>, Peter Anvin <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH] ptrace/x86: introduce TS_COMPAT_RESTART to fix get_nr_restart_syscall()
Date: Tue, 26 Nov 2019 12:07:58 +0100 [thread overview]
Message-ID: <20191126110758.GA14051@redhat.com> (raw)
In-Reply-To: <20191126110659.GA14042@redhat.com>
On 11/26, Oleg Nesterov wrote:
>
> This patch adds the sticky TS_COMPAT_RESTART flag which survives after
> return to user mode, hopefully it allows us to kill TS_I386_REGS_POKED
> but this needs another patch.
Alternatively we could add ->compat_restart into struct restart_block,
logically this is the same thing.
Rather than changing syscall_return_slowpath() we could introduce a new
helper, say,
void set_restart_block_fn(struct restart_block *restart, fn)
{
restart->fn = fn;
set/clear TS_COMPAT_RESTART or restart->compat_restart
depending on TS_COMPAT
}
but this patch looks simpler to me.
Oleg.
next prev parent reply other threads:[~2019-11-26 11:08 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 11:06 Oleg Nesterov
2019-11-26 11:07 ` Oleg Nesterov [this message]
2019-11-27 4:04 ` Linus Torvalds
2019-11-27 5:46 ` Andy Lutomirski
2019-11-27 17:06 ` Oleg Nesterov
2019-11-27 17:02 ` Oleg Nesterov
2019-11-27 17:21 ` Linus Torvalds
2019-11-28 15:36 ` Oleg Nesterov
2019-11-28 19:24 ` Linus Torvalds
2019-11-28 21:13 ` Andy Lutomirski
2019-11-29 17:32 ` Oleg Nesterov
2019-11-29 18:19 ` Andy Lutomirski
2019-11-29 17:21 ` Oleg Nesterov
2019-12-03 14:12 ` [PATCH v2 0/4] x86: " Oleg Nesterov
2019-12-03 14:13 ` [PATCH v2 1/4] introduce set_restart_fn() and arch_set_restart_data() Oleg Nesterov
2019-12-04 15:09 ` Oleg Nesterov
2019-12-04 15:09 ` [PATCH v3 " Oleg Nesterov
2019-12-03 14:13 ` [PATCH v2 2/4] x86: mv TS_COMPAT from asm/processor.h to asm/thread_info.h Oleg Nesterov
2019-12-03 14:13 ` [PATCH v2 3/4] x86: introduce TS_COMPAT_RESTART to fix get_nr_restart_syscall() Oleg Nesterov
2019-12-03 14:14 ` [PATCH v2 4/4] x86: introduce restart_block->arch_data to kill TS_COMPAT_RESTART Oleg Nesterov
2019-12-18 15:19 ` [PATCH v2 0/4] x86: fix get_nr_restart_syscall() Oleg Nesterov
2019-12-18 20:02 ` Linus Torvalds
2019-12-19 2:48 ` Andy Lutomirski
2020-02-17 15:54 ` Thomas Gleixner
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