On Sat, 05 Sep 2026 19:38:08 +0100, Aamir Ahmed wrote:
> Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with
> __counted_by") annotated the hws member of 'struct clk_hw_onecell_data'
> with __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS)
> about the number of elements in .hws[], so that it can warn when .hws[]
> is accessed out of bounds. As noted in that change, the __counted_by
> member must be initialized with the number of elements before the first
> array access happens, otherwise there will be a warning from each access
> prior to the initialization because the number of elements is zero.
> This occurs in ac100_rtc_register_clks() due to .num being assigned only
> after every clkout clock has been stored in .hws[]. With
> CONFIG_UBSAN_BOUNDS and a compiler that implements __counted_by (GCC
> 15.1+ or Clang 20.1+), this triggers an array-index-out-of-bounds report
> during probe, and with CONFIG_UBSAN_TRAP the first store traps.
>
> [...]
Applied, thanks!
[1/1] rtc: ac100: Assign .num before accessing .hws
https://git.kernel.org/abelloni/c/6a4117eee82d
Best regards,
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
