kernel/linux.git/fs/fat/fat_test.c, branch linux-7.1.y

fat: fix stack frame size warnings in KUnit tests

2026-03-26T13:36:03+00:00

The kernel test robot reported that on hexagon with clang, several test functions in fat_test.c exceed the 1280-byte stack frame limit. The root cause is the compound literal assignment in fat_test_set_time_offset(): *sbi = (struct msdos_sb_info){}; struct msdos_sb_info contains two hash tables of 256 hlist_head entries (FAT_HASH_SIZE), making it several kilobytes. The compound literal creates a temporary on the stack, and when clang inlines fat_test_set_time_offset() into each test function, the large temporary inflates every caller's stack frame beyond the limit. Replace the compound literal with memset() which zeroes the struct in-place without a stack temporary. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202603251755.4UYY1Rcd-lkp@intel.com/ Signed-off-by: Christian Brauner

fat: add KUnit tests for timestamp conversion helpers

2026-03-24T22:37:16+00:00

Extend fat_test with coverage for FAT timestamp edge cases that are not currently exercised. Add tests for fat_time_unix2fat() clamping at the UTC boundaries and when time_offset pushes an otherwise valid timestamp outside the FAT date range. Also cover the NULL time_cs path used by existing callers, and verify fat_truncate_atime() truncation across timezone offsets. Link: https://patch.msgid.link/20260315222404.9678-1-aviv.daum@gmail.com Acked-by: OGAWA Hirofumi Signed-off-by: avivdaum Signed-off-by: Christian Brauner

fs: fat: add missing MODULE_DESCRIPTION() macros

2024-05-28T10:06:55+00:00

Fix the 'make W=1' warnings: WARNING: modpost: missing MODULE_DESCRIPTION() in fs/fat/fat.o WARNING: modpost: missing MODULE_DESCRIPTION() in fs/fat/fat_test.o Signed-off-by: Jeff Johnson Link: https://lore.kernel.org/r/20240527-md-fs-fat-v1-1-b6ba7cfcb8aa@quicinc.com Acked-by: OGAWA Hirofumi Acked-by: Al Viro Signed-off-by: Christian Brauner

fat: Add KUnit tests for checksums and timestamps

2021-08-13T19:13:18+00:00

Add some basic sanity-check tests for the fat_checksum() function and the fat_time_unix2fat() and fat_time_fat2unix() functions. These unit tests verify these functions return correct output for a number of test inputs. These tests were inspired by -- and serve a similar purpose to -- the timestamp parsing KUnit tests in ext4[1]. Note that, unlike fat_time_unix2fat, fat_time_fat2unix wasn't previously exported, so this patch exports it as well. This is required for the case where we're building the fat and fat_test as modules. Fixed minor checkpatch coding style errors and typos in commit log: Shuah Khan [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/ext4/inode-test.c Signed-off-by: David Gow Acked-by: OGAWA Hirofumi Reviewed-by: Brendan Higgins Tested-by: Daniel Latypov Signed-off-by: Shuah Khan