Re: [PATCH v2] rust_binder: speed up get_node_debug_info using lower_bound iter

Hi Rafael,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]
[also build test ERROR on staging/staging-next staging/staging-linus linus/master v7.2-rc7 next-20260810]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Rafael-Passos/rust_binder-speed-up-get_node_debug_info-using-lower_bound-iter/20260806-233902
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20260731133253.661634-1-rafael%40rcpassos.me
patch subject: [PATCH v2] rust_binder: speed up get_node_debug_info using lower_bound iter
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260810/[email protected]/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260810/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   PATH=/opt/cross/clang-22/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   INFO PATH=/opt/cross/rustc-1.96.0-bindgen-0.72.1/cargo/bin:/opt/cross/clang-22/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   /usr/bin/timeout -k 100 12h /usr/bin/make KCFLAGS=\ -fno-crash-diagnostics\ -Wno-error=return-type\ -Wreturn-type\ -funsigned-char\ -Wundef\ -falign-functions=64 W=1 --keep-going LLVM=1 -j384 -C source O=/kbuild/obj/consumer/x86_64-rhel-9.4-rust ARCH=x86_64 SHELL=/bin/bash rustfmtcheck 
   make: Entering directory '/kbuild/src'
   make[1]: Entering directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
>> Diff in drivers/android/binder/process.rs:1175:
            {
                let inner = self.inner.lock();
                // cursor_lower_bound retrieves the "key" passed or the next existing larger key
   -            if let Some(cursor) = inner.nodes.cursor_lower_bound(&(ptr+1)){
   +            if let Some(cursor) = inner.nodes.cursor_lower_bound(&(ptr + 1)) {
                    let (_, node) = cursor.current();
                    node.populate_debug_info(&mut out, &inner);
                }
>> Diff in drivers/android/binder/process.rs:1175:
            {
                let inner = self.inner.lock();
                // cursor_lower_bound retrieves the "key" passed or the next existing larger key
   -            if let Some(cursor) = inner.nodes.cursor_lower_bound(&(ptr+1)){
   +            if let Some(cursor) = inner.nodes.cursor_lower_bound(&(ptr + 1)) {
                    let (_, node) = cursor.current();
                    node.populate_debug_info(&mut out, &inner);
                }
   make[2]: *** [Makefile:1998: rustfmt] Error 123
   make[1]: Leaving directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[2]: Target 'rustfmtcheck' not remade because of errors.
   make[1]: Target 'rustfmtcheck' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'rustfmtcheck' not remade because of errors.
   make: Leaving directory '/kbuild/src'

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