Re: [PATCH v4 1/4] sunrpc: add per-netns per-procedure call counts to svc_stat

[Jeff Layton <jlayton@kernel.org>]

On Tue, 2026-06-16 at 19:55 -0400, Chuck Lever wrote:
> Hey Jeff -
> 
> On Tue, Jun 16, 2026, at 8:45 AM, Jeff Layton wrote:
> > The existing per-procedure call counts live in global
> > svc_version->vs_count[] arrays which are not network-namespace-aware.
> > Add per-netns equivalents in struct svc_stat so the upcoming netlink
> > stats interface can return namespace-scoped statistics.
> > 
> > Add a vs_count pointer array to struct svc_stat, along with
> > svc_stat_alloc_counts() and svc_stat_free_counts() helpers to manage
> > per-version percpu call count arrays.
> 
> This patch appears to break the build for an NFSv3-only server
> configured with CONFIG_PROC_FS=n.
> 
> svc_stat_alloc_counts() and svc_stat_free_counts() are defined in
> net/sunrpc/stats.c, which the Makefile builds only under PROC_FS:
> 
>        sunrpc-$(CONFIG_PROC_FS) += stats.o
> 
> nfsd_net_init()/nfsd_net_exit() call both helpers unconditionally,
> and the declarations in <linux/sunrpc/stats.h> sit outside the
> #ifdef CONFIG_PROC_FS block with no !PROC_FS stubs. CONFIG_NFSD does
> not depend on PROC_FS -- only NFSD_V4 does -- so NFSD=y with
> NFSD_V2/V3 and PROC_FS=n is a valid Kconfig combination. The result
> is an undefined reference to svc_stat_alloc_counts at vmlinux link
> (NFSD=y), or a modpost failure for NFSD=m since both symbols are
> EXPORT_SYMBOL_GPL.
> 
> net/sunrpc/svc.c is always built, and might be a more natural home
> for the new functions.

Thanks. Looks pretty simple to fix. I'll plan to send a v5.
-- 
Jeff Layton <jlayton@kernel.org>