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Shivam Kalra
880fa3a1e5
Commit47ac2a4b5c("rust: kvec: implement shrink_to for KVVec") introduced a call to bindings::is_vmalloc_addr(). However, this fails to compile on architectures where CONFIG_MMU is disabled, resulting in the following build error: error[E0425]: cannot find function `is_vmalloc_addr` in crate `bindings` --> rust/kernel/alloc/kvec.rs:781:32 | 781 | if !unsafe { bindings::is_vmalloc_addr(self.ptr.as_ptr().cast()) } { | ^^^^^^^^^^^^^^^ not found in `bindings` When CONFIG_MMU is not set, is_vmalloc_addr() is defined as a static inline function in <linux/mm.h> that unconditionally returns false. Because bindgen skips static inline functions when generating bindings, the symbol is completely missing from the Rust bindings crate. Fix this by providing a C helper wrapper, rust_helper_is_vmalloc_addr(), in rust/helpers/vmalloc.c. This ensures the function is reliably exposed to Rust regardless of the MMU configuration. On NOMMU builds, this allows KVVec::shrink_to() to successfully compile and correctly route all allocations through the kmalloc realloc path. Fixes:47ac2a4b5c("rust: kvec: implement shrink_to for KVVec") Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202605220811.LRplxeBR-lkp@intel.com/ Signed-off-by: Shivam Kalra <shivamkalra98@zohomail.in> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://patch.msgid.link/20260523-is-vmalloc-addr-build-fix-v1-1-73c919440c41@zohomail.in [ Pasted exact compiler output and expanded it. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>