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powerpc/fadump: Set core e_flags using kernel's ELF ABI version

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Firmware Assisted Dump is a facility to dump kernel core with assistance
from firmware. As part of this process the kernel ELF ABI version is
stored in the core file.

Currently fadump.h defines this to 0 if it is not already defined. This
clashes with a define in elf.h which sets it based on the current task -
not based on the kernel's ELF ABI version.

Use the compiler-provided #define _CALL_ELF which tells us the ELF ABI
version of the kernel to set e_flags, this matches what binutils does.

Remove the definition in fadump.h, which becomes unused.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Daniel Axtens 2016-09-06 15:32:42 +10:00 committed by Michael Ellerman
parent 7c98bd7208
commit d8bced27be
2 changed files with 5 additions and 5 deletions
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4
arch/powerpc/include/asm/fadump.h
View File

@ -45,10 +45,6 @@
#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
#ifndef ELF_CORE_EFLAGS
#define ELF_CORE_EFLAGS 0
#endif
/* Firmware provided dump sections */
#define FADUMP_CPU_STATE_DATA 0x0001
#define FADUMP_HPTE_REGION 0x0002

6
arch/powerpc/kernel/fadump.c
View File

@ -778,7 +778,11 @@ static int fadump_init_elfcore_header(char *bufp)
elf->e_entry = 0;
elf->e_phoff = sizeof(struct elfhdr);
elf->e_shoff = 0;
elf->e_flags = ELF_CORE_EFLAGS;
#if defined(_CALL_ELF)
elf->e_flags = _CALL_ELF;
#else
elf->e_flags = 0;
#endif
elf->e_ehsize = sizeof(struct elfhdr);
elf->e_phentsize = sizeof(struct elf_phdr);
elf->e_phnum = 0;