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author | James Clark <james.clark@arm.com> | 2023-07-25 11:58:26 +0100 |
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committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-07-29 15:57:32 +0900 |
commit | 238353088e9b28d61f58994aa058d736fc306614 (patch) | |
tree | a8acb7ea8d7182bdb4088eb8a0c216d96327d5de /kernel | |
parent | 6eaae198076080886b9e7d57f4ae06fa782f90ef (diff) |
scripts/kallsyms: Fix build failure by setting errno before calling getline()
getline() returns -1 at EOF as well as on error. It also doesn't set
errno to 0 on success, so initialize it to 0 before using errno to check
for an error condition. See the paragraph here [1]:
For some system calls and library functions (e.g., getpriority(2)),
-1 is a valid return on success. In such cases, a successful return
can be distinguished from an error return by setting errno to zero
before the call, and then, if the call returns a status that indicates
that an error may have occurred, checking to see if errno has a
nonzero value.
Bear has a bug [2] that launches processes with errno set and causes the
following build failure:
$ bear -- make LLVM=1
...
LD .tmp_vmlinux.kallsyms1
NM .tmp_vmlinux.kallsyms1.syms
KSYMS .tmp_vmlinux.kallsyms1.S
read_symbol: Invalid argument
[1]: https://linux.die.net/man/3/errno
[2]: https://github.com/rizsotto/Bear/issues/469
Fixes: 1c975da56a6f ("scripts/kallsyms: remove KSYM_NAME_LEN_BUFFER")
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions