[PATCH v2] random: vDSO: Avoid call to memset() when zeroing reserved in __cvdso_getrandom_data()

[Jason A. Donenfeld]

On Thu, Oct 01, 2026 at 12:20:59PM +0200, Nathan Chancellor wrote:
> control. The change that introduced -max-store-memset only did it to
> "allow fine-tuning of the inlining threshold for performance analysis
> and optimization". If they decide to remove it for whatever reason,
> we're back to square one.

I suppose all the more reason to get -finline-stringops=memset added to
clang. Then the dual-default thing you came up with below will naturally
start choosing the first option when it becomes available.

> I know something like below would be uglier due to the ifdef but it
> would avoid changing anything for GCC while clearing up the issue at
> hand for clang in a guaranteed stable and succinct manner.

But then we're back to the byte-by-byte codegen that Christophe pointed
out.
 
> If that is not acceptable, something like the following does appear to
> work for me.

Okay, great, let's do that.

Does this commit seem okay with you? I used the diff you sent below and
adjusted the commit message: https://git.zx2c4.com/linux-rng/commit/?id=56ff95ee85715047eb5b5220243778af657778c8

Jason