linux-kernel - Re: [RFC PATCH 01/15] static kmem

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Message-ID: <aWHmUsxQDGHOdflq@casper.infradead.org>
Date: Sat, 10 Jan 2026 05:40:34 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: linux-mm@...ck.org, Vlastimil Babka <vbabka@...e.cz>,
	Harry Yoo <harry.yoo@...cle.com>, linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Mateusz Guzik <mguzik@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 01/15] static kmem_cache instances for core caches

On Sat, Jan 10, 2026 at 04:02:03AM +0000, Al Viro wrote:
> +++ b/Kbuild
> @@ -45,13 +45,24 @@ kernel/sched/rq-offsets.s: $(offsets-file)
>  $(rq-offsets-file): kernel/sched/rq-offsets.s FORCE
>  	$(call filechk,offsets,__RQ_OFFSETS_H__)
>  
> +# generate kmem_cache_size.h
> +
> +kmem_cache_size-file := include/generated/kmem_cache_size.h
> +
> +targets += mm/kmem_cache_size.s
> +
> +mm/kmem_cache_size.s: $(rq-offsets-file)
> +
> +$(kmem_cache_size-file): mm/kmem_cache_size.s FORCE
> +	$(call filechk,offsets,__KMEM_CACHE_SIZE_H__)
> +
>  # Check for missing system calls
>  
>  quiet_cmd_syscalls = CALL    $<
>        cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
>  
>  PHONY += missing-syscalls
> -missing-syscalls: scripts/checksyscalls.sh $(rq-offsets-file)
> +missing-syscalls: scripts/checksyscalls.sh $(kmem_cache_size-file)
>  	$(call cmd,syscalls)

Did you mean to _replace_  rq-offsets-file rather than add
kmem_cache_size-file ?

(I also wonder if we want to just do slab or if we want to make this
mm-offsets.h and maybe put other things in it later, but I'm having
trouble thinking of other things we might want to generate)