Re: [tip: objtool/urgent] objtool: Consolidate annotation macros

[Josh Poimboeuf]

On Wed, Dec 03, 2025 at 10:41:30AM -0800, Linus Torvalds wrote:
> On Wed, 3 Dec 2025 at 09:46, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
> >
> > So that mergeable thing is the only way to convince the toolchains to
> > allow setting the section entsize
> 
> Ugh. What a horrid reason. That *should* be trivially done by just
> having a linker script setting, but if one doesn't exist...

Believe me, I looked and there's surprisingly no way to do that from
linker script.

> What are the actual entry sizes, though? Because maybe we could just
> use alignment instead - which is trivially settable in the linker
> script.

That could work.  At least .altinstructions (14 bytes) and __ex_table
(12 bytes) aren't power of two.

We could certainly pad them, That does increase memory usage though.  On
my defconfig kernel that would add about ~11k.

-- 
Josh