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config: Fix LLVM-21 -Wuninitialized-const-pointer warning

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LLVM-21 enables -Wuninitialized-const-pointer which results in the
following compiler warning and the bdev_file_open_by_path() interface
not being detected for 6.9 and newer kernels.  The blk_holder_ops
are not used by the ZFS code so we can safely use a NULL argument
for this check.

    bdev_file_open_by_path/bdev_file_open_by_path.c:110:54: error:
    variable 'h' is uninitialized when passed as a const pointer
    argument here [-Werror,-Wuninitialized-const-pointer]

Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17682
Closes #17684
This commit is contained in:
Brian Behlendorf 2025-09-02 09:34:08 -07:00
parent 92d4b135b6
commit 24baccb75e
1 changed files with 3 additions and 6 deletions
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9
config/kernel-blkdev.m4
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@ -29,9 +29,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH_4ARG], [
const char *path = "path";
fmode_t mode = 0;
void *holder = NULL;
struct blk_holder_ops h;
bdev = blkdev_get_by_path(path, mode, holder, &h);
bdev = blkdev_get_by_path(path, mode, holder, NULL);
])
])
@ -48,9 +47,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_OPEN_BY_PATH], [
const char *path = "path";
fmode_t mode = 0;
void *holder = NULL;
struct blk_holder_ops h;
bdh = bdev_open_by_path(path, mode, holder, &h);
bdh = bdev_open_by_path(path, mode, holder, NULL);
])
])
@ -68,9 +66,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BDEV_FILE_OPEN_BY_PATH], [
const char *path = "path";
fmode_t mode = 0;
void *holder = NULL;
struct blk_holder_ops h;
file = bdev_file_open_by_path(path, mode, holder, &h);
file = bdev_file_open_by_path(path, mode, holder, NULL);
])
])