git: kern: Use __builtin_return_address(0) to fix -Warray-bounds warnings

[Aaron LI]

commit c5b78520dd7e00f2e2c8ca8de060e75cf17c0ce7
Author: Aaron LI <aly at aaronly.me>
Date:   Tue Oct 13 10:47:50 2026 +0800

    kern: Use __builtin_return_address(0) to fix -Warray-bounds warnings
    
    Fix the following -Warray-bounds warnings from GCC 12.5:
    
    ```
    In function '_lockmgr_assert',
        inlined from 'lockmgr_shared' at /usr/src/sys/kern/kern_lock.c:117:2:
    /usr/src/sys/kern/kern_lock.c:97:17: warning: array subscript -1 is outside array bounds of 'struct lock[0]' [-Warray-bounds]
       97 |                 panic("lockmgr %s from %p: called from interrupt, ipi, "
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       98 |                       "or hard code section",
          |                       ~~~~~~~~~~~~~~~~~~~~~~~
       99 |                       lkp->lk_wmesg, ((int **)&lkp)[-1]);
          |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    /usr/src/sys/kern/kern_slaballoc.c: In function 'kmem_slab_alloc':
    /usr/src/sys/kern/kern_slaballoc.c:1750:9: warning: array subscript -1 is outside array bounds of 'vm_size_t[1]' {aka 'long unsigned int[1]'} [-Warray-bounds]
     1750 |         panic("kmem_slab_alloc: bad flags %08x (%p)",
          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     1751 |               flags, ((int **)&size)[-1]);
          |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ```

Summary of changes:
 sys/kern/kern_lock.c      | 2 +-
 sys/kern/kern_slaballoc.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/c5b78520dd7e00f2e2c8ca8de060e75cf17c0ce7


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