linux-kernel - Re: [PATCH 01/23] all: syscall wrappers: add documentation

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Message-Id: <20160525.135039.244098606649448826.davem@davemloft.net>
Date:	Wed, 25 May 2016 13:50:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	ynorov@...iumnetworks.com, catalin.marinas@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
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Subject: Re: [PATCH 01/23] all: syscall wrappers: add documentation

From: Arnd Bergmann <arnd@...db.de>
Date: Wed, 25 May 2016 22:47:33 +0200

> If we use the normal calling conventions, we could remove these overrides
> along with the respective special-case handling in glibc. None of them
> look particularly performance-sensitive, but I could be wrong there.

You could set the lowest bit in the system call entry pointer to indicate
the upper-half clears should be elided.