Re: [PATCH v5 5/7] arm64: uprobes: Add GCS support to uretprobes

[Catalin Marinas <catalin.marinas@arm.com>]

On Wed, Aug 13, 2025 at 02:12:30PM +0800, kernel test robot wrote:
> Hi Jeremy,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on arm64/for-next/core]
> [also build test ERROR on perf-tools-next/perf-tools-next tip/perf/core perf-tools/perf-tools linus/master v6.17-rc1 next-20250812]
> [cannot apply to acme/perf/core]
> [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/Jeremy-Linton/arm64-probes-Break-ret-out-from-bl-blr/20250811-221529
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
> patch link:    https://lore.kernel.org/r/20250811141010.741989-6-jeremy.linton%40arm.com
> patch subject: [PATCH v5 5/7] arm64: uprobes: Add GCS support to uretprobes
> config: arm64-randconfig-r111-20250813 (https://download.01.org/0day-ci/archive/20250813/202508131334.FfoZQ27h-lkp@intel.com/config)
> compiler: aarch64-linux-gcc (GCC) 13.4.0
> reproduce: (https://download.01.org/0day-ci/archive/20250813/202508131334.FfoZQ27h-lkp@intel.com/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 <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202508131334.FfoZQ27h-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    arch/arm64/kernel/probes/uprobes.c: In function 'arch_uretprobe_hijack_return_addr':
> >> arch/arm64/kernel/probes/uprobes.c:171:33: error: implicit declaration of function 'get_user_gcs'; did you mean 'put_user_gcs'? [-Werror=implicit-function-declaration]
>      171 |                 gcs_ret_vaddr = get_user_gcs((unsigned long __user *)gcspr, &err);
>          |                                 ^~~~~~~~~~~~
>          |                                 put_user_gcs
>    cc1: some warnings being treated as errors

I guess that's explained by patch 3 not being updated.

-- 
Catalin