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From: Jan Kiszka <jan.kiszka@siemens.com>
To: Philippe Gerum <rpm@xenomai.org>, Xenomai <xenomai@xenomai.org>
Subject: Dovetail/x86 still broken /wrt exception fixups
Date: Tue, 1 Jun 2021 23:24:51 +0200	[thread overview]
Message-ID: <d38b6799-ed3e-f384-a70e-51c2d5170c73@siemens.com> (raw)

Hi Philippe,

we are leaking the inband stall state into user land when the kernel
takes a fixable exception in oob. The problem is either
cond_disable_irqs() or its (missing?) counterpart. Where is the stall
bit set in handle_page_fault->cond_disable_irqs supposed to be cleared
again?

I-pipe is fine in that regard, but it took us many years to get it into
that state - and it didn't have to deal with the impact of ca4c6a9858
("x86/traps: Make interrupt enable/disable symmetric in C code") anymore...

Jan

-- 
Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux


             reply	other threads:[~2021-06-01 21:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-01 21:24 Jan Kiszka [this message]
2021-06-02 15:29 ` Dovetail/x86 still broken /wrt exception fixups Jan Kiszka
2021-06-02 17:43   ` Philippe Gerum
2021-06-02 16:53 ` Philippe Gerum

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