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kexec_file: Fix kexec_file.c build error for riscv platform

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When CONFIG_KEXEC_FILE is set for riscv platform, the compilation of
kernel/kexec_file.c generate build error:

kernel/kexec_file.c: In function 'crash_prepare_elf64_headers':
./arch/riscv/include/asm/page.h:110:71: error: request for member 'virt_addr' in something not a structure or union
  110 |  ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < kernel_map.virt_addr))
      |                                                                       ^
./arch/riscv/include/asm/page.h:131:2: note: in expansion of macro 'is_linear_mapping'
  131 |  is_linear_mapping(_x) ?       \
      |  ^~~~~~~~~~~~~~~~~
./arch/riscv/include/asm/page.h:140:31: note: in expansion of macro '__va_to_pa_nodebug'
  140 | #define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
      |                               ^~~~~~~~~~~~~~~~~~
./arch/riscv/include/asm/page.h:143:24: note: in expansion of macro '__phys_addr_symbol'
  143 | #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
      |                        ^~~~~~~~~~~~~~~~~~
kernel/kexec_file.c:1327:36: note: in expansion of macro '__pa_symbol'
 1327 |   phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);

This occurs is because the "kernel_map" referenced in macro
is_linear_mapping()  is suppose to be the one of struct kernel_mapping
defined in arch/riscv/mm/init.c, but the 2nd argument of
crash_prepare_elf64_header() has same symbol name, in expansion of macro
is_linear_mapping in function crash_prepare_elf64_header(), "kernel_map"
actually is the local variable.

Signed-off-by: Liao Chang <liaochang1@huawei.com>
Link: https://lore.kernel.org/r/20220408100914.150110-2-lizhengyu3@huawei.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Liao Chang 2022-04-08 18:09:09 +08:00 committed by Palmer Dabbelt
parent 3123109284
commit 4853f68d15
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GPG key ID: EF4CA1502CCBAB41
2 changed files with 3 additions and 3 deletions
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2
include/linux/kexec.h
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@ -227,7 +227,7 @@ struct crash_mem {
extern int crash_exclude_mem_range(struct crash_mem *mem,
unsigned long long mstart,
unsigned long long mend);
extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
void **addr, unsigned long *sz);
#endif /* CONFIG_KEXEC_FILE */

4
kernel/kexec_file.c
View file

@ -1260,7 +1260,7 @@ int crash_exclude_mem_range(struct crash_mem *mem,
return 0;
}
int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
void **addr, unsigned long *sz)
{
Elf64_Ehdr *ehdr;
@ -1324,7 +1324,7 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
phdr++;
/* Prepare PT_LOAD type program header for kernel text region */
if (kernel_map) {
if (need_kernel_map) {
phdr->p_type = PT_LOAD;
phdr->p_flags = PF_R|PF_W|PF_X;
phdr->p_vaddr = (unsigned long) _text;