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

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>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index b3a663333d36..624ddcf728e0 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -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;