linux-kernel - Re: [PATCH v4 0/2] make sigaltstack() compatible with swapcontext()

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Date:	Sun, 6 Mar 2016 21:27:38 +0100
From:	Szabolcs Nagy <nsz@...t70.net>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH v4 0/2] make sigaltstack() compatible with swapcontext()

* Szabolcs Nagy <nsz@...t70.net> [2016-03-06 21:02:08 +0100]:
> * Stas Sergeev <stsp@...t.ru> [2016-03-01 00:29:03 +0300]:
> > The following patches make it possible to use swapcontext()
> > in a sighandler that works on sigaltstack.
> 
> i don't think that's possible, the (obsolete) userspace
> *context functions cannot operate on kernel provided
> ucontext_t structs, so they are not usable in signal
> handlers.
> 
> at least not on most target archs.
> 
> so i don't understand how the tests can work portably.
> 

i see the test does not use the kernel ucontext_t
and only synchronous context switch is done

sorry for the noise.