[avpatel:riscv_trace_support_v4 43/58] arch/riscv/kernel/sbi_mpxy.c:287:5: error: call to undeclared function 'memdesc_section'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/avpatel/linux.git riscv_trace_support_v4
head:   077795f92007de48afcaeab45f9e9217537966d8
commit: d114c0cd70da2e1a20620050e0fa8e512b2d24c4 [43/58] RISC-V: Move common MPXY helper routines to arch/riscv
config: riscv-randconfig-r051-20260710 (https://download.01.org/0day-ci/archive/20260710/202607100920.4mX8HxCL-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project b3e6e6dabdc02153552a64fc74ff5c7532447eed)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260710/202607100920.4mX8HxCL-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/202607100920.4mX8HxCL-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/riscv/kernel/sbi_mpxy.c:287:5: error: call to undeclared function 'memdesc_section'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     287 |                          page_to_phys(shmem_page), 0, 0, 0, 0, 0);
         |                          ^
   include/asm-generic/memory_model.h:85:37: note: expanded from macro 'page_to_phys'
      85 | #define page_to_phys(page)      PFN_PHYS(page_to_pfn(page))
         |                                          ^
   include/asm-generic/memory_model.h:73:21: note: expanded from macro 'page_to_pfn'
      73 | #define page_to_pfn __page_to_pfn
         |                     ^
   include/asm-generic/memory_model.h:56:14: note: expanded from macro '__page_to_pfn'
      56 |         int __sec = memdesc_section(__pg->flags);               \
         |                     ^
   arch/riscv/kernel/sbi_mpxy.c:289:29: error: call to undeclared function 'memdesc_section'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     289 |                 free_pages((unsigned long)page_to_virt(shmem_page),
         |                                           ^
   arch/riscv/include/asm/page.h:160:41: note: expanded from macro 'page_to_virt'
     160 | #define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
         |                                              ^
   include/asm-generic/memory_model.h:73:21: note: expanded from macro 'page_to_pfn'
      73 | #define page_to_pfn __page_to_pfn
         |                     ^
   include/asm-generic/memory_model.h:56:14: note: expanded from macro '__page_to_pfn'
      56 |         int __sec = memdesc_section(__pg->flags);               \
         |                     ^
   arch/riscv/kernel/sbi_mpxy.c:294:16: error: call to undeclared function 'memdesc_section'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     294 |         mpxy->shmem = page_to_virt(shmem_page);
         |                       ^
   arch/riscv/include/asm/page.h:160:41: note: expanded from macro 'page_to_virt'
     160 | #define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
         |                                              ^
   include/asm-generic/memory_model.h:73:21: note: expanded from macro 'page_to_pfn'
      73 | #define page_to_pfn __page_to_pfn
         |                     ^
   include/asm-generic/memory_model.h:56:14: note: expanded from macro '__page_to_pfn'
      56 |         int __sec = memdesc_section(__pg->flags);               \
         |                     ^
   arch/riscv/kernel/sbi_mpxy.c:295:26: error: call to undeclared function 'memdesc_section'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     295 |         mpxy->shmem_phys_addr = page_to_phys(shmem_page);
         |                                 ^
   include/asm-generic/memory_model.h:85:37: note: expanded from macro 'page_to_phys'
      85 | #define page_to_phys(page)      PFN_PHYS(page_to_pfn(page))
         |                                          ^
   include/asm-generic/memory_model.h:73:21: note: expanded from macro 'page_to_pfn'
      73 | #define page_to_pfn __page_to_pfn
         |                     ^
   include/asm-generic/memory_model.h:56:14: note: expanded from macro '__page_to_pfn'
      56 |         int __sec = memdesc_section(__pg->flags);               \
         |                     ^
   4 errors generated.


vim +/memdesc_section +287 arch/riscv/kernel/sbi_mpxy.c

   267	
   268	static int mpxy_setup_shmem(unsigned int cpu)
   269	{
   270		struct page *shmem_page;
   271		struct mpxy_local *mpxy;
   272		struct sbiret sret;
   273	
   274		mpxy = per_cpu_ptr(&mpxy_local, cpu);
   275		if (mpxy->shmem_active)
   276			return 0;
   277	
   278		shmem_page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(mpxy_shmem_size));
   279		if (!shmem_page)
   280			return -ENOMEM;
   281	
   282		/*
   283		 * Linux setup of shmem is done in mpxy OVERWRITE mode.
   284		 * flags[1:0] = 00b
   285		 */
   286		sret = sbi_ecall(SBI_EXT_MPXY, SBI_EXT_MPXY_SET_SHMEM,
 > 287				 page_to_phys(shmem_page), 0, 0, 0, 0, 0);
   288		if (sret.error) {
   289			free_pages((unsigned long)page_to_virt(shmem_page),
   290				   get_order(mpxy_shmem_size));
   291			return sbi_err_map_linux_errno(sret.error);
   292		}
   293	
   294		mpxy->shmem = page_to_virt(shmem_page);
   295		mpxy->shmem_phys_addr = page_to_phys(shmem_page);
   296		mpxy->shmem_active = true;
   297	
   298		return 0;
   299	}
   300	

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