Re: [PATCH 2/4] media: atomisp: Fix startup() section placement with -ffunction-sections

[Peter Zijlstra]

On Wed, Nov 12, 2025 at 03:47:49PM -0800, Josh Poimboeuf wrote:
> When compiling the kernel with -ffunction-sections (e.g., for LTO,
> livepatch, dead code elimination, AutoFDO, or Propeller), the startup()
> function gets compiled into the .text.startup section.  In some cases it
> can even be cloned into .text.startup.constprop.0 or
> .text.startup.isra.0.
> 
> However, the .text.startup and .text.startup.* section names are already
> reserved for use by the compiler for __attribute__((constructor)) code.
> 

Urgh, that's a 'fun' one. Is this not a -ffunction-sections bug? I mean,
the compiler should never put regular non-reserved user symbols in a
section it has reserved for itself, right?