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Date: Tue, 4 Aug 2020 09:48:11 -0500
From: "Madhavan T. Venkataraman" <>
To: David Laight <David.Laight@...LAB.COM>,
 'Mark Rutland' <>
Cc: Andy Lutomirski <>,
 Kernel Hardening <>,
 Linux API <>,
 linux-arm-kernel <>,
 Linux FS Devel <>,
 linux-integrity <>,
 LKML <>,
 LSM List <>,
 Oleg Nesterov <>, X86 ML <>
Subject: Re: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor

On 8/4/20 9:33 AM, David Laight wrote:
>>> If you look at the libffi reference patch I have included, the architecture
>>> specific changes to use trampfd just involve a single C function call to
>>> a common code function.
> No idea what libffi is, but it must surely be simpler to
> rewrite it to avoid nested function definitions.

Sorry if I wasn't clear.

libffi is a separate use case and GCC nested functions is a separate one.
libffi is not used to solve the nested function stuff.

For nested functions, GCC generates trampoline code and arranges to
place it on the stack and execute it.

I agree with your other points about nested function implementation.

> Or find a book from the 1960s on how to do recursive
> calls and nested functions in FORTRAN-IV.
> 	David
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)

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