ARM: 6485/5: proc/vmcore - allow archs to override vmcore_elf_check_arch()

Allow architectures to redefine this macro if needed. This is useful for
example in architectures where 64-bit ELF vmcores are not supported.
Specifying zero vmcore_elf64_check_arch() allows compiler to optimize
away unnecessary parts of parse_crash_elf64_headers().

We also rename the macro to vmcore_elf64_check_arch() to reflect that it
is used for 64-bit vmcores only.

Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index 0026f267da20..088cd4ace4ef 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -20,7 +20,14 @@ extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
 #define vmcore_elf_check_arch_cross(x) 0
 #endif
 
-#define vmcore_elf_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
+/*
+ * Architecture code can redefine this if there are any special checks
+ * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
+ * this can be set to zero.
+ */
+#ifndef vmcore_elf64_check_arch
+#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
+#endif
 
 /*
  * is_kdump_kernel() checks whether this kernel is booting after a panic of