fs/dlm/midcomms.c:913:22: sparse: sparse: restricted __le32 degrades to integer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dfd42facf1e4ada021b939b4e19c935dcdd55566
commit: 658bd576f95ed597e519cdadf1c86ac87c17aea5 fs: dlm: move version conversion to compile time
date:   3 months ago
config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220208/202202080253.WdgaN4vt-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=658bd576f95ed597e519cdadf1c86ac87c17aea5
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 658bd576f95ed597e519cdadf1c86ac87c17aea5
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)
   fs/dlm/midcomms.c:213:1: sparse: sparse: symbol '__srcu_struct_nodes_srcu' was not declared. Should it be static?
   fs/dlm/midcomms.c:570:25: sparse: sparse: cast to restricted __le32
   fs/dlm/midcomms.c:678:19: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:680:16: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:718:27: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:737:25: sparse: sparse: cast to restricted __le32
   fs/dlm/midcomms.c:747:25: sparse: sparse: cast to restricted __le32
   fs/dlm/midcomms.c:756:23: sparse: sparse: cast to restricted __le32
   fs/dlm/midcomms.c:766:42: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:769:26: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:804:23: sparse: sparse: cast to restricted __le32
   fs/dlm/midcomms.c:838:27: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:898:26: sparse: sparse: cast to restricted __le16
   fs/dlm/midcomms.c:920:25: sparse: sparse: cast to restricted __le32
>> fs/dlm/midcomms.c:913:22: sparse: sparse: restricted __le32 degrades to integer
   fs/dlm/midcomms.c:916:22: sparse: sparse: restricted __le32 degrades to integer
   fs/dlm/midcomms.c:1056:20: sparse: sparse: context imbalance in 'dlm_midcomms_get_mhandle' - wrong count at exit
   fs/dlm/midcomms.c: note: in included file (through include/linux/notifier.h, arch/x86/include/asm/uprobes.h, include/linux/uprobes.h, ...):
   include/linux/srcu.h:188:9: sparse: sparse: context imbalance in 'dlm_midcomms_commit_mhandle' - unexpected unlock

vim +913 fs/dlm/midcomms.c

   871	
   872	/*
   873	 * Called from the low-level comms layer to process a buffer of
   874	 * commands.
   875	 */
   876	
   877	int dlm_process_incoming_buffer(int nodeid, unsigned char *buf, int len)
   878	{
   879		const unsigned char *ptr = buf;
   880		const struct dlm_header *hd;
   881		uint16_t msglen;
   882		int ret = 0;
   883	
   884		while (len >= sizeof(struct dlm_header)) {
   885			hd = (struct dlm_header *)ptr;
   886	
   887			/* no message should be more than DLM_MAX_SOCKET_BUFSIZE or
   888			 * less than dlm_header size.
   889			 *
   890			 * Some messages does not have a 8 byte length boundary yet
   891			 * which can occur in a unaligned memory access of some dlm
   892			 * messages. However this problem need to be fixed at the
   893			 * sending side, for now it seems nobody run into architecture
   894			 * related issues yet but it slows down some processing.
   895			 * Fixing this issue should be scheduled in future by doing
   896			 * the next major version bump.
   897			 */
   898			msglen = le16_to_cpu(hd->h_length);
   899			if (msglen > DLM_MAX_SOCKET_BUFSIZE ||
   900			    msglen < sizeof(struct dlm_header)) {
   901				log_print("received invalid length header: %u from node %d, will abort message parsing",
   902					  msglen, nodeid);
   903				return -EBADMSG;
   904			}
   905	
   906			/* caller will take care that leftover
   907			 * will be parsed next call with more data
   908			 */
   909			if (msglen > len)
   910				break;
   911	
   912			switch (hd->h_version) {
 > 913			case cpu_to_le32(DLM_VERSION_3_1):
   914				dlm_midcomms_receive_buffer_3_1((union dlm_packet *)ptr, nodeid);
   915				break;
   916			case cpu_to_le32(DLM_VERSION_3_2):
   917				dlm_midcomms_receive_buffer_3_2((union dlm_packet *)ptr, nodeid);
   918				break;
   919			default:
   920				log_print("received invalid version header: %u from node %d, will skip this message",
   921					  le32_to_cpu(hd->h_version), nodeid);
   922				break;
   923			}
   924	
   925			ret += msglen;
   926			len -= msglen;
   927			ptr += msglen;
   928		}
   929	
   930		return ret;
   931	}
   932	

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