linux-kernel - Re: [PATCH v9 9/9] liveupdate: kho: Use %pe format specifier for error pointer printing

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Message-ID: <mafs0h5vbclw6.fsf@kernel.org>
Date: Mon, 03 Nov 2025 13:59:21 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: akpm@...ux-foundation.org,  brauner@...nel.org,  corbet@....net,
  graf@...zon.com,  jgg@...pe.ca,  linux-kernel@...r.kernel.org,
  linux-kselftest@...r.kernel.org,  linux-mm@...ck.org,
  masahiroy@...nel.org,  ojeda@...nel.org,  pratyush@...nel.org,
  rdunlap@...radead.org,  rppt@...nel.org,  tj@...nel.org,
  yanjun.zhu@...ux.dev
Subject: Re: [PATCH v9 9/9] liveupdate: kho: Use %pe format specifier for
 error pointer printing

On Sat, Nov 01 2025, Pasha Tatashin wrote:

> From: Zhu Yanjun <yanjun.zhu@...ux.dev>
>
> Make pr_xxx() call to use the %pe format specifier instead of %d.
> The %pe specifier prints a symbolic error string (e.g., -ENOMEM,
> -EINVAL) when given an error pointer created with ERR_PTR(err).
>
> This change enhances the clarity and diagnostic value of the error
> message by showing a descriptive error name rather than a numeric
> error code.
>
> Note, that some err are still printed by value, as those errors
> might come from libfdt and not regular errnos.

There is fdt_strerror() that does this for libfdt errnos. Something to
do in a follow up patch I suppose.

>
> Signed-off-by: Zhu Yanjun <yanjun.zhu@...ux.dev>
> Co-developed-by: Pasha Tatashin <pasha.tatashin@...een.com>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> Reviewed-by: Simon Horman <horms@...nel.org>

Reviewed-by: Pratyush Yadav <pratyush@...nel.org>

[...]

-- 
Regards,
Pratyush Yadav