linux-kernel - Re: [PATCH v2 1/4] alpha/uapi: do not expose kernel-only stack frame structures

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Message-ID: <e66ea9e2bf462f1aa29a9ae535d5f1470668616d.camel@physik.fu-berlin.de>
Date: Mon, 03 Feb 2025 12:01:01 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Ivan Kokshaysky <ink@...een.parts>, Richard Henderson	
 <richard.henderson@...aro.org>, Matt Turner <mattst88@...il.com>, Oleg
 Nesterov	 <oleg@...hat.com>, Al Viro <viro@...iv.linux.org.uk>, Arnd
 Bergmann	 <arnd@...db.de>, "Paul E. McKenney" <paulmck@...nel.org>
Cc: "Maciej W. Rozycki" <macro@...am.me.uk>, Magnus Lindholm
 <linmag7@...il.com>, 	linux-alpha@...r.kernel.org,
 linux-kernel@...r.kernel.org, 	stable@...r.kernel.org
Subject: Re: [PATCH v2 1/4] alpha/uapi: do not expose kernel-only stack
 frame structures

Hi Ivan,

On Fri, 2025-01-31 at 11:41 +0100, Ivan Kokshaysky wrote:
> Parts of asm/ptrace.h went into UAPI with commit 96433f6ee490
> ("UAPI: (Scripted) Disintegrate arch/alpha/include/asm") back in 2012.
> At first glance it looked correct, as many other architectures expose
> 'struct pt_regs' for ptrace(2) PTRACE_GETREGS/PTRACE_SETREGS requests
> and bpf(2) BPF_PROG_TYPE_KPROBE/BPF_PROG_TYPE_PERF_EVENT program
> types.
> 
> On Alpha, however, these requests have never been implemented;
> 'struct pt_regs' describes internal kernel stack frame which has
> nothing to do with userspace. Same applies to 'struct switch_stack',
> as PTRACE_GETFPREG/PTRACE_SETFPREG are not implemented either.
> 
> Move this stuff back into internal asm, where we can ajust it

Typo: ajust => adjust

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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