[PATCH] nvme: enable FDP support

[kernel test robot]

Hi Kanchan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on linus/master v6.9-rc7 next-20240510]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kanchan-Joshi/nvme-enable-FDP-support/20240510-214900
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20240510134015.29717-1-joshi.k%40samsung.com
patch subject: [PATCH] nvme: enable FDP support
config: x86_64-randconfig-121-20240511 (https://download.01.org/0day-ci/archive/20240511/202405111758.Ts2xnoZH-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.5.0-4ubuntu2) 9.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240511/202405111758.Ts2xnoZH-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405111758.Ts2xnoZH-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/nvme/host/core.c:2120:30: sparse: sparse: cast to restricted __le16
   drivers/nvme/host/core.c:2126:38: sparse: sparse: cast to restricted __le16
   drivers/nvme/host/core.c: note: in included file (through include/linux/wait.h, include/linux/wait_bit.h, include/linux/fs.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +2120 drivers/nvme/host/core.c

  2098	
  2099	static int nvme_fetch_fdp_plids(struct nvme_ns *ns, u32 nsid)
  2100	{
  2101		struct nvme_command c = {};
  2102		struct nvme_fdp_ruh_status *ruhs;
  2103		struct nvme_fdp_ruh_status_desc *ruhsd;
  2104		int size, ret, i;
  2105	
  2106		size = sizeof(*ruhs) + NVME_MAX_PLIDS * sizeof(*ruhsd);
  2107		ruhs = kzalloc(size, GFP_KERNEL);
  2108		if (!ruhs)
  2109			return -ENOMEM;
  2110	
  2111		c.imr.opcode = nvme_cmd_io_mgmt_recv;
  2112		c.imr.nsid = cpu_to_le32(nsid);
  2113		c.imr.mo = 0x1;
  2114		c.imr.numd =  cpu_to_le32((size >> 2) - 1);
  2115	
  2116		ret = nvme_submit_sync_cmd(ns->queue, &c, ruhs, size);
  2117		if (ret)
  2118			goto out;
  2119	
> 2120		ns->head->nr_plids = le16_to_cpu(ruhs->nruhsd);
  2121		ns->head->nr_plids =
  2122			min_t(u16, ns->head->nr_plids, NVME_MAX_PLIDS);
  2123	
  2124		for (i = 0; i < ns->head->nr_plids; i++) {
  2125			ruhsd = &ruhs->ruhsd[i];
  2126			ns->head->plids[i] = le16_to_cpu(ruhsd->pid);
  2127		}
  2128	out:
  2129		kfree(ruhs);
  2130		return ret;
  2131	}
  2132	

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