Re: [PATCH v1 1/2] vsprintf: Add %pR human-readable size

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] The patch introduces a KUnit test regression by unconditionally appending a human-readable resource size for memory ranges, affecting the raw '%pr' format as well as the decoded '%pR' format. The commit message states it adds the size to '%pR', but the code incorrectly modifies both formats, breaking the printf test suite.
--

--- Patch [1]: [PATCH v1 1/2] vsprintf: Add %pR human-readable size ---
commit d77ec66543a5589a88168c27ffcdb3693182c105
Author: Bjorn Helgaas <helgaas@kernel.org>

vsprintf: Add %pR human-readable size

Include human-readable size when printing struct resource memory ranges
with the %pR format to make it easier to read.

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 2bc6ef483576c..c49044b6dbeeb 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
[ ... ]
> @@ -1134,6 +1136,14 @@ char *resource_string(char *buf, char *end, struct resource *res,
>  	} else {
>  		p = hex_range(p, pend, res->start, res->end, *specp);
>  	}
> +	if (res->flags & IORESOURCE_MEM) {
> +		*p++ = ' ';
> +		*p++ = '(';
> +		string_get_size(resource_size(res), 1, STRING_UNITS_2,
> +				size_buf, sizeof(size_buf));
> +		p = string_nocheck(p, pend, size_buf, str_spec);
> +		*p++ = ')';
> +	}

[Severity: Medium]
Does this code inadvertently modify the raw '%pr' format as well?

The commit message states it adds the size to '%pR', but this check doesn't
verify the 'decode' boolean before appending the human-readable size.

This unconditionally appends the human-readable resource size for memory ranges,
which affects the raw '%pr' format and breaks KUnit tests expecting the
unmodified output:

lib/tests/printf_kunit.c:struct_resource() {
    ...
    test("[mem 0xc0ffee00 flags 0x200]",
         "%pr", &test_resource);
    ...
}

>  	if (decode) {
>  		if (res->flags & IORESOURCE_MEM_64)
>  			p = string_nocheck(p, pend, " 64bit", str_spec);

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260808172308.282591-1-bhelgaas@google.com?part=1