[LU-19979] Improve keyring_search confgure test

• Type: Bug
• Resolution: Fixed
• Priority: Medium
• Fix Version/s: Lustre 2.18.0
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Shaun Tancheff

Description

Checking the keyring_search compile test manually:

shaun@plucky:~/lustre-wc-rel/_lpb/keyring_search_4args_pc$ make modules -C /usr/src/linux-headers-6.14.0-37-generic  M=/home/shaun/lustre-wc-rel/_lpb/keyring_search_4args_pc CONFIG_CC_VERSION_TEXT='gcc..Ubuntu.14.2.0-19ubuntu2..14.2.0'
make: Entering directory '/usr/src/linux-headers-6.14.0-37-generic'
make[1]: Entering directory '/home/shaun/lustre-wc-rel/_lpb/keyring_search_4args_pc'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: gcc..Ubuntu.14.2.0-19ubuntu2..14.2.0
  You are using:           gcc-14 (Ubuntu 14.2.0-19ubuntu2) 14.2.0
  CC [M]  keyring_search_4args_pc.o
keyring_search_4args_pc.c: In function ‘main’:
keyring_search_4args_pc.c:77:17: warning: ‘keyring’ is used uninitialized [-Wuninitialized]
   77 |                 keyring_search(keyring, NULL, NULL, false);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
keyring_search_4args_pc.c:76:27: note: ‘keyring’ was declared here
   76 |                 key_ref_t keyring;
      |                     ^~~~~~~
  MODPOST Module.symvers
  CC [M]  keyring_search_4args_pc.mod.o
  LD [M]  keyring_search_4args_pc.ko
  BTF [M] keyring_search_4args_pc.ko
Skipping BTF generation for keyring_search_4args_pc.ko due to unavailability of vmlinux
make[1]: Leaving directory '/home/shaun/lustre-wc-rel/_lpb/keyring_search_4args_pc'
make: Leaving directory '/usr/src/linux-headers-6.14.0-37-generic'

This should be improved to avoid the possible:
warning: ‘keyring’ is used uninitialized [-Wuninitialized]
being promoted to an error in the future.