[LU-14865] ppc64le build failure: llog_reader.c:887:9: error: format '%llu' expects argument of type 'long long unsigned int', but argument 2 has type '__u64' [-Werror=format=]

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Affects Version/s: Lustre 2.12.7, Lustre 2.15.0
• Labels: LTS12 llnl
• Environment: TOSS 3.7.9 (RHEL 7.9) power pc
• Severity: 3
• Assignee: Gian-Carlo Defazio
• Reporter: Gian-Carlo Defazio

Description

When building our local branch, which is based on v2_12_7, the ppc64le build fails due to a type error:

llog_reader.c:887:9: error: format '%llu' expects argument of type 'long long unsigned int', but argument 2 has type '__u64' [-Werror=format=]

This is due to a printf call that uses %llu whereas __le64_to_cpu returns a __u64. Elsewhere in the same file the return value of __le64_to_cpu is cast as necessary to match the print formatting, including to an unsigned long long.