netdev - Re: [PATCH net-next v2 12/12] net: homa: create Makefile and Kconfig

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Message-ID: <CAGXJAmyeJ2HWxOZj8uY0_Cu47Yy_hAYfSRGmYpNfLGd2PR7Q-Q@mail.gmail.com>
Date: Mon, 18 Nov 2024 13:23:57 -0800
From: John Ousterhout <ouster@...stanford.edu>
To: kernel test robot <lkp@...el.com>
Cc: netdev@...r.kernel.org, linux-api@...r.kernel.org, 
	oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH net-next v2 12/12] net: homa: create Makefile and Kconfig

I believe I have fixed all of the kernel test robot issues reported
under this subject line.

-John-


On Wed, Nov 13, 2024 at 5:53 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi John,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on net-next/main]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/John-Ousterhout/net-homa-define-user-visible-API-for-Homa/20241112-074535
> base:   net-next/main
> patch link:    https://lore.kernel.org/r/20241111234006.5942-13-ouster%40cs.stanford.edu
> patch subject: [PATCH net-next v2 12/12] net: homa: create Makefile and Kconfig
> config: riscv-randconfig-r112-20241113 (https://download.01.org/0day-ci/archive/20241113/202411132114.VB5yFmtR-lkp@intel.com/config)
> compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
> reproduce: (https://download.01.org/0day-ci/archive/20241113/202411132114.VB5yFmtR-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202411132114.VB5yFmtR-lkp@intel.com/
>
> sparse warnings: (new ones prefixed by >>)
> >> net/homa/homa_sock.c:201:31: sparse: sparse: cast removes address space '__rcu' of expression
>    net/homa/homa_sock.c:248:17: sparse: sparse: context imbalance in 'homa_sock_shutdown' - different lock contexts for basic block
>    net/homa/homa_sock.c:303:21: sparse: sparse: context imbalance in 'homa_sock_bind' - different lock contexts for basic block
>
> vim +/__rcu +201 net/homa/homa_sock.c
>
> 8ddf00265eb650 John Ousterhout 2024-11-11  183
> 8ddf00265eb650 John Ousterhout 2024-11-11  184  /*
> 8ddf00265eb650 John Ousterhout 2024-11-11  185   * homa_sock_unlink() - Unlinks a socket from its socktab and does
> 8ddf00265eb650 John Ousterhout 2024-11-11  186   * related cleanups. Once this method returns, the socket will not be
> 8ddf00265eb650 John Ousterhout 2024-11-11  187   * discoverable through the socktab.
> 8ddf00265eb650 John Ousterhout 2024-11-11  188   */
> 8ddf00265eb650 John Ousterhout 2024-11-11  189  void homa_sock_unlink(struct homa_sock *hsk)
> 8ddf00265eb650 John Ousterhout 2024-11-11  190  {
> 8ddf00265eb650 John Ousterhout 2024-11-11  191          struct homa_socktab *socktab = hsk->homa->port_map;
> 8ddf00265eb650 John Ousterhout 2024-11-11  192          struct homa_socktab_scan *scan;
> 8ddf00265eb650 John Ousterhout 2024-11-11  193
> 8ddf00265eb650 John Ousterhout 2024-11-11  194          /* If any scans refer to this socket, advance them to refer to
> 8ddf00265eb650 John Ousterhout 2024-11-11  195           * the next socket instead.
> 8ddf00265eb650 John Ousterhout 2024-11-11  196           */
> 8ddf00265eb650 John Ousterhout 2024-11-11  197          spin_lock_bh(&socktab->write_lock);
> 8ddf00265eb650 John Ousterhout 2024-11-11  198          list_for_each_entry(scan, &socktab->active_scans, scan_links) {
> 8ddf00265eb650 John Ousterhout 2024-11-11  199                  if (!scan->next || scan->next->sock != hsk)
> 8ddf00265eb650 John Ousterhout 2024-11-11  200                          continue;
> 8ddf00265eb650 John Ousterhout 2024-11-11 @201                  scan->next = (struct homa_socktab_links *)hlist_next_rcu(&scan
> 8ddf00265eb650 John Ousterhout 2024-11-11  202                                  ->next->hash_links);
> 8ddf00265eb650 John Ousterhout 2024-11-11  203          }
> 8ddf00265eb650 John Ousterhout 2024-11-11  204          hlist_del_rcu(&hsk->socktab_links.hash_links);
> 8ddf00265eb650 John Ousterhout 2024-11-11  205          spin_unlock_bh(&socktab->write_lock);
> 8ddf00265eb650 John Ousterhout 2024-11-11  206  }
> 8ddf00265eb650 John Ousterhout 2024-11-11  207
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki