[PATCH v8] RISC-V: enable XIP

[Naresh Kamboju]

my two cents,

The riscv build failed on Linux -next 20210426 tag kernel due to
below warnings / errors.
Following builds failed.
 - riscv (tinyconfig) with gcc-8
 - riscv (allnoconfig) with gcc-8
 - riscv (tinyconfig) with gcc-9
 - riscv (allnoconfig) with gcc-9
 - riscv (tinyconfig) with gcc-10
 - riscv (allnoconfig) with gcc-10

> >> > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> >> > index 30e4af0fd50c..2ddf654c72bb 100644
> >> > --- a/arch/riscv/kernel/setup.c
> >> > +++ b/arch/riscv/kernel/setup.c
> >> > @@ -50,7 +50,11 @@ struct screen_info screen_info __section(".data") = {
> >> >   * This is used before the kernel initializes the BSS so it can't be in the
> >> >   * BSS.
> >> >   */
> >> > -atomic_t hart_lottery __section(".sdata");
> >> > +atomic_t hart_lottery __section(".sdata")
> >> > +#ifdef CONFIG_XIP_KERNEL
> >> > += ATOMIC_INIT(0xC001BEEF)
> >> > +#endif
> >> > +;
> >> >  unsigned long boot_cpu_hartid;
> >> >  static DEFINE_PER_CPU(struct cpu, cpu_devices);
> >> >
> >> > @@ -254,7 +258,7 @@ void __init setup_arch(char **cmdline_p)
> >> >  #if IS_ENABLED(CONFIG_BUILTIN_DTB)
> >> >       unflatten_and_copy_device_tree();
> >> >  #else
> >> > -     if (early_init_dt_verify(__va(dtb_early_pa)))
> >> > +     if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))

arch/riscv/kernel/setup.c: In function 'setup_arch':
arch/riscv/kernel/setup.c:284:32: error: implicit declaration of
function 'XIP_FIXUP' [-Werror=implicit-function-declaration]
  if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
                                ^~~~~~~~~
arch/riscv/include/asm/page.h:112:62: note: in definition of macro
'linear_mapping_pa_to_va'
 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) +
va_pa_offset))
                                                              ^
arch/riscv/include/asm/page.h:156:27: note: in expansion of macro
'__pa_to_va_nodebug'
 #define __va(x)  ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
                           ^~~~~~~~~~~~~~~~~~
arch/riscv/kernel/setup.c:284:27: note: in expansion of macro '__va'
  if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
                           ^~~~
cc1: some warnings being treated as errors

Reported-by: Naresh Kamboju <naresh.kamboju at linaro.org>


steps to reproduce:
---------------------------
# TuxMake is a command line tool and Python library that provides
# portable and repeatable Linux kernel builds across a variety of
# architectures, toolchains, kernel configurations, and make targets.
#
# TuxMake supports the concept of runtimes.
# See https://docs.tuxmake.org/runtimes/, for that to work it requires
# that you install podman or docker on your system.
#
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake
#
# See https://docs.tuxmake.org/ for complete documentation.


tuxmake --runtime podman --target-arch riscv --toolchain gcc-8
--kconfig allnoconfig

--
Linaro LKFT
https://lkft.linaro.org