linux-kernel - Re: [PATCH] RDMA: fix INFINIBAND_USER

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Date:   Mon, 3 Jul 2023 16:32:42 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...nel.org>
Cc:     Jason Gunthorpe <jgg@...pe.ca>,
        Selvin Xavier <selvin.xavier@...adcom.com>,
        Arnd Bergmann <arnd@...db.de>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA: fix INFINIBAND_USER_ACCESS dependency

On Mon, Jul 03, 2023 at 01:30:06PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> After a change to the bnxt_re driver, it fails to link when
> CONFIG_INFINIBAND_USER_ACCESS is disabled:
> 
> aarch64-linux-ld: drivers/infiniband/hw/bnxt_re/ib_verbs.o: in function `bnxt_re_handler_BNXT_RE_METHOD_ALLOC_PAGE':
> ib_verbs.c:(.text+0xd64): undefined reference to `ib_uverbs_get_ucontext_file'
> aarch64-linux-ld: drivers/infiniband/hw/bnxt_re/ib_verbs.o:(.rodata+0x168): undefined reference to `uverbs_idr_class'
> aarch64-linux-ld: drivers/infiniband/hw/bnxt_re/ib_verbs.o:(.rodata+0x1a8): undefined reference to `uverbs_destroy_def_handler'
> 
> The problem is that the 'bnxt_re_uapi_defs' structure is built
> unconditionally and references a couple of functions that are never
> really called in this configuration but instead require other functions
> that are left out.
> 
> Adding an #ifdef around the new code, or a Kconfig dependency would
> address this problem, but adding the compile-time check inside of the
> UAPI_DEF_CHAIN_OBJ_TREE_NAMED() macro seems best because that also
> addresses the problem in other drivers that may run into the same
> dependency.
> 
> Fixes: 360da60d6c6ed ("RDMA/bnxt_re: Enable low latency push")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/rdma/uverbs_ioctl.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 

Thanks,
Acked-by: Leon Romanovsky <leon@...nel.org>

Linus, can you please apply this patch directly as it is overkill to
send PR for one patch?

https://lore.kernel.org/all/20230703113025.356682-1-arnd@kernel.org

Thanks