linux-kernel - RE: [PATCH 2/2] dwarves: cus__load

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Date:   Wed, 16 Mar 2022 22:00:57 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     kkourt@...urt.io, Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     dwarves@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kornilios Kourtis <kornilios@...valent.com>
Subject: RE: [PATCH 2/2] dwarves: cus__load_files: set errno if load fails

kkourt@ wrote:
> From: Kornilios Kourtis <kornilios@...valent.com>
> 
> This patch improves the error seen by the user by setting errno in
> cus__load_files(). Otherwise, we get a "No such file or directory" error
> which might be confusing.
> 
> Before the patch, using a bogus file:
> $ ./pahole -J ./vmlinux-5.3.18-24.102-default.debug
> pahole: ./vmlinux-5.3.18-24.102-default.debug: No such file or directory
> $ ls ./vmlinux-5.3.18-24.102-default.debug
> /home/kkourt/src/hubble-fgs/vmlinux-5.3.18-24.102-default.debug
> 
> After the patch:
> $ ./pahole -J ./vmlinux-5.3.18-24.102-default.debug
> pahole: ./vmlinux-5.3.18-24.102-default.debug: Unknown error -22
> 
> Which is not very helpful, but less confusing.
> 
> Signed-off-by: Kornilios Kourtis <kornilios@...valent.com>
> ---

With the err to -err fix Arnaldo proposed.

Acked-by: John Fastabend <john.fastabend@...il.com>