Re: [PATCH v16 14/27] riscv: Implements arch agnostic indirect branch tracking prctls

Re: [PATCH v16 14/27] riscv: Implements arch agnostic indirect branch tracking prctls

[kernel test robot]

Hi Deepak,

kernel test robot noticed the following build errors:

[auto build test ERROR on 4181f8ad7a1061efed0219951d608d4988302af7]

url:    https://github.com/intel-lab-lkp/linux/commits/Deepak-Gupta/mm-VM_SHADOW_STACK-definition-for-riscv/20250523-133343
base:   4181f8ad7a1061efed0219951d608d4988302af7
patch link:    https://lore.kernel.org/r/20250522-v5_user_cfi_series-v16-14-64f61a35eee7%40rivosinc.com
patch subject: [PATCH v16 14/27] riscv: Implements arch agnostic indirect branch tracking prctls
config: riscv-randconfig-001-20250524 (https://download.01.org/0day-ci/archive/20250524/202505240659.OGVR0xHg-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250524/202505240659.OGVR0xHg-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/202505240659.OGVR0xHg-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/riscv/kernel/entry.S:172:9: error: immediate must be an integer in the range [-2147483648, 4294967295]
    li t0, 0x00040000 | (0x00006000 | 0x00000600) | 0x020000000000
           ^


vim +172 arch/riscv/kernel/entry.S

   155	
   156	.Lsave_context:
   157		REG_S sp, TASK_TI_USER_SP(tp)
   158		REG_L sp, TASK_TI_KERNEL_SP(tp)
   159		addi sp, sp, -(PT_SIZE_ON_STACK)
   160		REG_S x1,  PT_RA(sp)
   161		REG_S x3,  PT_GP(sp)
   162		REG_S x5,  PT_T0(sp)
   163		save_from_x6_to_x31
   164	
   165		/*
   166		 * Disable user-mode memory access as it should only be set in the
   167		 * actual user copy routines.
   168		 *
   169		 * Disable the FPU/Vector to detect illegal usage of floating point
   170		 * or vector in kernel space.
   171		 */
 > 172		li t0, SR_SUM | SR_FS_VS | SR_ELP
   173	
   174		REG_L s0, TASK_TI_USER_SP(tp)
   175		csrrc s1, CSR_STATUS, t0
   176		save_userssp s2, s1
   177		csrr s2, CSR_EPC
   178		csrr s3, CSR_TVAL
   179		csrr s4, CSR_CAUSE
   180		csrr s5, CSR_SCRATCH
   181		REG_S s0, PT_SP(sp)
   182		REG_S s1, PT_STATUS(sp)
   183		REG_S s2, PT_EPC(sp)
   184		REG_S s3, PT_BADADDR(sp)
   185		REG_S s4, PT_CAUSE(sp)
   186		REG_S s5, PT_TP(sp)
   187	
   188		/*
   189		 * Set the scratch register to 0, so that if a recursive exception
   190		 * occurs, the exception vector knows it came from the kernel
   191		 */
   192		csrw CSR_SCRATCH, x0
   193	
   194		/* Load the global pointer */
   195		load_global_pointer
   196	
   197		/* Load the kernel shadow call stack pointer if coming from userspace */
   198		scs_load_current_if_task_changed s5
   199	

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