Re: [PATCH] block: cmdline-parser: add support for hidden disk space

[kbuild test robot <lkp@intel.com>]

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Hi Shawn,

[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]

config: x86_64-randconfig-x005-201539 (attached as .config)
reproduce:
  git checkout 937e3ebb4c7763e6120eda4a7e5b8c96bd710a9f
  # save the attached .config to linux build tree
  make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/uapi/linux/capability.h:16,
                    from include/linux/capability.h:15,
                    from include/linux/sched.h:15,
                    from include/linux/blkdev.h:4,
                    from include/linux/cmdline-parser.h:10,
                    from block/cmdline-parser.c:8:
   block/cmdline-parser.c: In function 'parse_parts':
   block/cmdline-parser.c:136:9: error: 'subpart' undeclared (first use in this function)
      if (!(subpart->flags & PF_HIDDEN))
            ^
   include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
     if (__builtin_constant_p((cond)) ? !!(cond) :   \
                               ^
>> block/cmdline-parser.c:136:3: note: in expansion of macro 'if'
      if (!(subpart->flags & PF_HIDDEN))
      ^
   block/cmdline-parser.c:136:9: note: each undeclared identifier is reported only once for each function it appears in
      if (!(subpart->flags & PF_HIDDEN))
            ^
   include/linux/compiler.h:147:28: note: in definition of macro '__trace_if'
     if (__builtin_constant_p((cond)) ? !!(cond) :   \
                               ^
>> block/cmdline-parser.c:136:3: note: in expansion of macro 'if'
      if (!(subpart->flags & PF_HIDDEN))
      ^

vim +/if +136 block/cmdline-parser.c

     2	 * Parse command line, get partition information
     3	 *
     4	 * Written by Cai Zhiyong <caizhiyong@huawei.com>
     5	 *
     6	 */
     7	#include <linux/export.h>
   > 8	#include <linux/cmdline-parser.h>
     9	
    10	static int parse_subpart(struct cmdline_subpart **subpart, char *partdef)
    11	{
    12		int ret = 0;
    13		struct cmdline_subpart *new_subpart;
    14	
    15		*subpart = NULL;
    16	
    17		new_subpart = kzalloc(sizeof(struct cmdline_subpart), GFP_KERNEL);
    18		if (!new_subpart)
    19			return -ENOMEM;
    20	
    21		if (*partdef == '-') {
    22			new_subpart->size = (sector_t)(~0ULL);
    23			partdef++;
    24		} else {
    25			new_subpart->size = (sector_t)memparse(partdef, &partdef);
    26			if (new_subpart->size < (sector_t)PAGE_SIZE) {
    27				pr_warn("cmdline partition size is invalid.");
    28				ret = -EINVAL;
    29				goto fail;
    30			}
    31		}
    32	
    33		if (*partdef == '@') {
    34			partdef++;
    35			new_subpart->from = (sector_t)memparse(partdef, &partdef);
    36		} else {
    37			new_subpart->from = (sector_t)(~0ULL);
    38		}
    39	
    40		if (*partdef == '(') {
    41			int length;
    42			char *next = strchr(++partdef, ')');
    43	
    44			if (!next) {
    45				pr_warn("cmdline partition format is invalid.");
    46				ret = -EINVAL;
    47				goto fail;
    48			}
    49	
    50			length = min_t(int, next - partdef,
    51				       sizeof(new_subpart->name) - 1);
    52			strncpy(new_subpart->name, partdef, length);
    53			new_subpart->name[length] = '\0';
    54	
    55			partdef = ++next;
    56		} else
    57			new_subpart->name[0] = '\0';
    58	
    59		new_subpart->flags = 0;
    60	
    61		if (!strncmp(partdef, "ro", 2)) {
    62			new_subpart->flags |= PF_RDONLY;
    63			partdef += 2;
    64		}
    65	
    66		if (!strncmp(partdef, "lk", 2)) {
    67			new_subpart->flags |= PF_POWERUP_LOCK;
    68			partdef += 2;
    69		}
    70	
    71		if (!strncmp(partdef, "hidden", 6)) {
    72			new_subpart->flags |= PF_HIDDEN;
    73			partdef += 6;
    74		}
    75	
    76		*subpart = new_subpart;
    77		return 0;
    78	fail:
    79		kfree(new_subpart);
    80		return ret;
    81	}
    82	
    83	static void free_subpart(struct cmdline_parts *parts)
    84	{
    85		struct cmdline_subpart *subpart;
    86	
    87		while (parts->subpart) {
    88			subpart = parts->subpart;
    89			parts->subpart = subpart->next_subpart;
    90			kfree(subpart);
    91		}
    92	}
    93	
    94	static int parse_parts(struct cmdline_parts **parts, const char *bdevdef)
    95	{
    96		int ret = -EINVAL;
    97		char *next;
    98		int length;
    99		struct cmdline_subpart **next_subpart;
   100		struct cmdline_parts *newparts;
   101		char buf[BDEVNAME_SIZE + 32 + 4];
   102	
   103		*parts = NULL;
   104	
   105		newparts = kzalloc(sizeof(struct cmdline_parts), GFP_KERNEL);
   106		if (!newparts)
   107			return -ENOMEM;
   108	
   109		next = strchr(bdevdef, ':');
   110		if (!next) {
   111			pr_warn("cmdline partition has no block device.");
   112			goto fail;
   113		}
   114	
   115		length = min_t(int, next - bdevdef, sizeof(newparts->name) - 1);
   116		strncpy(newparts->name, bdevdef, length);
   117		newparts->name[length] = '\0';
   118		newparts->nr_subparts = 0;
   119	
   120		next_subpart = &newparts->subpart;
   121	
   122		while (next && *(++next)) {
   123			bdevdef = next;
   124			next = strchr(bdevdef, ',');
   125	
   126			length = (!next) ? (sizeof(buf) - 1) :
   127				min_t(int, next - bdevdef, sizeof(buf) - 1);
   128	
   129			strncpy(buf, bdevdef, length);
   130			buf[length] = '\0';
   131	
   132			ret = parse_subpart(next_subpart, buf);
   133			if (ret)
   134				goto fail;
   135	
 > 136			if (!(subpart->flags & PF_HIDDEN))
   137				newparts->nr_subparts++;
   138	
   139			next_subpart = &(*next_subpart)->next_subpart;

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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