[LU-18906] Fix build for gcc-11 / kernel 6.11

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Shaun Tancheff

Description

A couple of recent landings have broken new kernel client builds:

  CC [M]  .../lustre-release/lustre/ptlrpc/nrs_orr.o
.../lustre-release/lustre/ptlrpc/nrs_orr.c: In function ‘nrs_orr_supp2str’:
.../lustre-release/lustre/ptlrpc/nrs_orr.c:1680:1: error: control reaches end of non-void function [-Werror=return-type]
 1680 | }
      | ^
cc1: all warnings being treated as errors

Fixes: f7b1fea6bff ("LU-16518 lustre: fix implicit-fallthrough warnings")

.../lustre-release/lustre/llite/file.c: In function ‘ll_dir_finish_open’:
.../lustre-release/lustre/llite/file.c:678:24: error: implicit declaration of function ‘page_cache_alloc’; did you mean ‘kmem_cache_alloc’? [-Werror=implicit-function-declaration]
  678 |                 page = page_cache_alloc(inode->i_mapping);
      |                        ^~~~~~~~~~~~~~~~
      |                        kmem_cache_alloc
.../lustre-release/lustre/llite/file.c:678:22: error: assignment to ‘struct page *’ from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion]
  678 |                 page = page_cache_alloc(inode->i_mapping);
      |                      ^
cc1: all warnings being treated as errors

Fixes: 4a14a51a8e0 ("LU-18448 llite: read dir on open")

Issue Links

• is related to: LU-18916 rocky 9.5 compile error: ptlrpc/nrs_orr.c
• is related to: LU-18892 page_cache_alloc undefined on Ubuntu 24.04.2, kernel 6.11.0