Re: [PATCH v9 1/8] sched/core: Add __might_sleep_precision()

[Peter Zijlstra <peterz@infradead.org>]

On Sat, Jan 25, 2025 at 07:18:46PM +0900, FUJITA Tomonori wrote:
> Add __might_sleep_precision(), Rust friendly version of
> __might_sleep(), which takes a pointer to a string with the length
> instead of a null-terminated string.
> 
> Rust's core::panic::Location::file(), which gives the file name of a
> caller, doesn't provide a null-terminated
> string. __might_sleep_precision() uses a precision specifier in the
> printk format, which specifies the length of a string; a string
> doesn't need to be a null-terminated.
> 
> Modify __might_sleep() to call __might_sleep_precision() but the
> impact should be negligible. strlen() isn't called in a normal case;
> it's called only when printing the error (sleeping function called
> from invalid context).
> 
> Note that Location::file() providing a null-terminated string for
> better C interoperability is under discussion [1].

Urgh :/