linux-kernel - Re: [GIT PULL] Wimplicit-fallthrough patches for 5.3-rc1

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Date:   Wed, 10 Jul 2019 14:15:26 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Wimplicit-fallthrough patches for 5.3-rc1

Hi Gustavo,

On Tue, 9 Jul 2019 13:20:10 -0500 "Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote:
>
>   Makefile: Globally enable fall-through warning (2019-07-08 15:23:22 -0500)

There are still a few of these warnings in various builds.  My x86_64
allmodconfig build after merging your tree into Linus' tree this
morning looked like below (which is way better than when you started).
I reported (most of) these along the way ...

arch/x86/events/intel/core.c: In function 'intel_pmu_init':
arch/x86/events/intel/core.c:4959:8: warning: this statement may fall through [-Wimplicit-fallthrough=]
   pmem = true;
   ~~~~~^~~~~~
arch/x86/events/intel/core.c:4960:2: note: here
  case INTEL_FAM6_SKYLAKE_MOBILE:
  ^~~~
arch/x86/events/intel/core.c:5008:8: warning: this statement may fall through [-Wimplicit-fallthrough=]
   pmem = true;
   ~~~~~^~~~~~
arch/x86/events/intel/core.c:5009:2: note: here
  case INTEL_FAM6_ICELAKE_MOBILE:
  ^~~~
fs/btrfs/props.c: In function 'inherit_props':
fs/btrfs/props.c:389:4: warning: 'num_bytes' may be used uninitialized in this function [-Wmaybe-uninitialized]
    btrfs_block_rsv_release(fs_info, trans->block_rsv,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      num_bytes);
      ~~~~~~~~~~
drivers/mtd/nand/onenand/onenand_base.c: In function 'onenand_check_features':
drivers/mtd/nand/onenand/onenand_base.c:3261:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (ONENAND_IS_DDP(this))
      ^
drivers/mtd/nand/onenand/onenand_base.c:3281:2: note: here
  case ONENAND_DEVICE_DENSITY_2Gb:
  ^~~~
drivers/mtd/nand/onenand/onenand_base.c:3285:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
   this->options |= ONENAND_HAS_UNLOCK_ALL;
drivers/mtd/nand/onenand/onenand_base.c:3287:2: note: here
  case ONENAND_DEVICE_DENSITY_1Gb:
  ^~~~
drivers/net/ethernet/intel/igb/e1000_82575.c: In function 'igb_get_invariants_82575':
drivers/net/ethernet/intel/igb/e1000_82575.c:636:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (igb_sgmii_uses_mdio_82575(hw)) {
      ^
drivers/net/ethernet/intel/igb/e1000_82575.c:642:2: note: here
  case E1000_CTRL_EXT_LINK_MODE_PCIE_SERDES:
  ^~~~
drivers/net/ethernet/intel/igb/igb_main.c: In function '__igb_notify_dca':
drivers/net/ethernet/intel/igb/igb_main.c:6692:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (dca_add_requester(dev) == 0) {
      ^
drivers/net/ethernet/intel/igb/igb_main.c:6699:2: note: here
  case DCA_PROVIDER_REMOVE:
  ^~~~
drivers/net/ethernet/intel/i40e/i40e_xsk.c: In function 'i40e_run_xdp_zc':
drivers/net/ethernet/intel/i40e/i40e_xsk.c:217:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   bpf_warn_invalid_xdp_action(act);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/intel/i40e/i40e_xsk.c:218:2: note: here
  case XDP_ABORTED:
  ^~~~

-- 
Cheers,
Stephen Rothwell

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