linux-kernel - Re: [PATCH] ptrace GET/SET FPXREGS broken

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Date:	Mon, 30 Jun 2008 14:02:45 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	TAKADA Yoshihito <takada@....nifty.com>
Cc:	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] ptrace GET/SET FPXREGS broken

Thanks for the report.  That was indeed a regression from 2.6.24 in ptrace.
To match traditional behavior, ptrace should only ever return -EIO for all
kinds of errors accessing registers (except for the -ESRCH cases).  But it
is cleaner for the user_regset calls to use meaningful error codes, and
-ENODEV is what makes sense for the !cpu_has_fxsr case.
So the right fix for this is in ptrace, not in user_regset.

Ingo, please revert takada's patch and apply the one about to come from me.


Thanks,
Roland
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