Re: [v2 PATCH 5/5] RISC-V: Add EFI stub support.

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

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Hi Atish,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.7-rc1 next-20200413]
[cannot apply to efi/next arm/for-next arm64/for-next/core linux/master]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Atish-Patra/Add-UEFI-support-for-RISC-V/20200414-053224
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8f3d9f354286745c751374f5f1fcafee6b3f3136
config: riscv-nommu_virt_defconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.3.0 make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

   drivers/firmware/efi/earlycon.c: In function 'efi_earlycon_map':
>> drivers/firmware/efi/earlycon.c:59:34: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
      59 |  fb_prot = fb_wb ? PAGE_KERNEL : pgprot_writecombine(PAGE_KERNEL);
         |                                  ^~~~~~~~~~~~~~~~~~~
>> drivers/firmware/efi/earlycon.c:59:32: error: type mismatch in conditional expression
      59 |  fb_prot = fb_wb ? PAGE_KERNEL : pgprot_writecombine(PAGE_KERNEL);
         |                                ^
   cc1: some warnings being treated as errors
--
   drivers/firmware/efi/libstub/riscv-stub.c: In function 'efi_enter_kernel':
>> drivers/firmware/efi/libstub/riscv-stub.c:64:33: warning: initialization makes '__attribute__((noreturn))' qualified function pointer from unqualified [-Wdiscarded-qualifiers]
      64 |  jump_kernel_func jump_kernel = (void (*)(unsigned int, unsigned long))kernel_entry;
         |                                 ^

vim +64 drivers/firmware/efi/libstub/riscv-stub.c

    53	
    54	/*
    55	 * Jump to real kernel here with following constraints.
    56	 * 1. MMU should be disabled.
    57	 * 2. a0 should contain hartid
    58	 * 3. a1 should DT address
    59	 */
    60	void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
    61					 unsigned long fdt_size)
    62	{
    63		unsigned long kernel_entry = entrypoint + (unsigned long)stext_offset;
  > 64		jump_kernel_func jump_kernel = (void (*)(unsigned int, unsigned long))kernel_entry;
    65		u32 hartid = get_boot_hartid_from_fdt(fdt);
    66	
    67		if (hartid == U32_MAX)
    68			/* We can not use panic or BUG at this point */
    69			__asm__ __volatile__ ("ebreak");
    70		/* Disable MMU */
    71		csr_write(CSR_SATP, 0);
    72		jump_kernel(hartid, fdt);
    73	}
    74	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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