linux-kernel - Re: [PATCH 15/50] kernel/numa.c: Move logging out of numa.h

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Date: Tue, 19 Dec 2023 09:36:44 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, tglx@...utronix.de, x86@...nel.org,
	tj@...nel.org, peterz@...radead.org, mathieu.desnoyers@...icios.com,
	paulmck@...nel.org, keescook@...omium.org,
	dave.hansen@...ux.intel.com, mingo@...hat.com, will@...nel.org,
	longman@...hat.com, boqun.feng@...il.com, brauner@...nel.org
Subject: Re: [PATCH 15/50] kernel/numa.c: Move logging out of numa.h

On Fri, Dec 15, 2023 at 10:26:14PM -0500, Kent Overstreet wrote:
> Moving these stub functions to a .c file means we can kill a sched.h
> dependency on printk.h.
> 
> Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
> ---
>  include/linux/numa.h | 18 +++++-------------
>  kernel/Makefile      |  1 +
>  kernel/numa.c        | 24 ++++++++++++++++++++++++
>  3 files changed, 30 insertions(+), 13 deletions(-)
>  create mode 100644 kernel/numa.c
> 
> diff --git a/include/linux/numa.h b/include/linux/numa.h
> index a904861de800..aeab3d9f57ae 100644
> --- a/include/linux/numa.h
> +++ b/include/linux/numa.h
> @@ -22,34 +22,26 @@
>  #endif
>  
>  #ifdef CONFIG_NUMA
> -#include <linux/printk.h>
>  #include <asm/sparsemem.h>
>  
>  /* Generic implementation available */
>  int numa_nearest_node(int node, unsigned int state);
>  
>  #ifndef memory_add_physaddr_to_nid
> -static inline int memory_add_physaddr_to_nid(u64 start)
> -{
> -	pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n",
> -			start);
> -	return 0;
> -}
> +int memory_add_physaddr_to_nid(u64 start);
>  #endif
> +
>  #ifndef phys_to_target_node
> -static inline int phys_to_target_node(u64 start)
> -{
> -	pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
> -			start);
> -	return 0;
> -}
> +int phys_to_target_node(u64 start);
>  #endif
> +
>  #ifndef numa_fill_memblks
>  static inline int __init numa_fill_memblks(u64 start, u64 end)
>  {
>  	return NUMA_NO_MEMBLK;
>  }
>  #endif
> +
>  #else /* !CONFIG_NUMA */
>  static inline int numa_nearest_node(int node, unsigned int state)
>  {
> diff --git a/kernel/Makefile b/kernel/Makefile
> index 3947122d618b..ce105a5558fc 100644
> --- a/kernel/Makefile
> +++ b/kernel/Makefile
> @@ -114,6 +114,7 @@ obj-$(CONFIG_SHADOW_CALL_STACK) += scs.o
>  obj-$(CONFIG_HAVE_STATIC_CALL) += static_call.o
>  obj-$(CONFIG_HAVE_STATIC_CALL_INLINE) += static_call_inline.o
>  obj-$(CONFIG_CFI_CLANG) += cfi.o
> +obj-$(CONFIG_NUMA) += numa.o
>  
>  obj-$(CONFIG_PERF_EVENTS) += events/
>  
> diff --git a/kernel/numa.c b/kernel/numa.c
> new file mode 100644
> index 000000000000..c24c72f45989
> --- /dev/null
> +++ b/kernel/numa.c
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include <linux/printk.h>
> +#include <linux/numa.h>
> +
> +/* Stub functions: */
> +
> +#ifndef memory_add_physaddr_to_nid
> +int memory_add_physaddr_to_nid(u64 start)
> +{
> +	pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n",
> +			start);
> +	return 0;
> +}
> +#endif
> +
> +#ifndef phys_to_target_node
> +int phys_to_target_node(u64 start)
> +{
> +	pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
> +			start);
> +	return 0;
> +}
> +#endif
> -- 
> 2.43.0
> 

These need EXPORT_SYMBOL_GPL() now like the architecture specific
implementations because they are no longer inlined. My arm64 builds fail
with:

  ERROR: modpost: "memory_add_physaddr_to_nid" [drivers/acpi/nfit/nfit.ko] undefined!
  ERROR: modpost: "phys_to_target_node" [drivers/acpi/nfit/nfit.ko] undefined!
  ERROR: modpost: "memory_add_physaddr_to_nid" [drivers/virtio/virtio_mem.ko] undefined!
  ERROR: modpost: "phys_to_target_node" [drivers/dax/dax_cxl.ko] undefined!
  ERROR: modpost: "memory_add_physaddr_to_nid" [drivers/dax/dax_cxl.ko] undefined!
  ERROR: modpost: "phys_to_target_node" [drivers/cxl/cxl_acpi.ko] undefined!
  ERROR: modpost: "memory_add_physaddr_to_nid" [drivers/cxl/cxl_pmem.ko] undefined!
  ERROR: modpost: "phys_to_target_node" [drivers/cxl/cxl_pmem.ko] undefined!
  ERROR: modpost: "memory_add_physaddr_to_nid" [drivers/hv/hv_balloon.ko] undefined!

Cheers,
Nathan