x86: kexec_file: purge system-ram walking from prepare_elf64_headers()
authorAKASHI Takahiro <takahiro.akashi@linaro.org>
Fri, 13 Apr 2018 22:35:53 +0000 (15:35 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 14 Apr 2018 00:10:27 +0000 (17:10 -0700)
commitcbe6601617302b0998d7f6779d04a222fc3a819b
tree0cc4eeb5223314a541f7bd755c5df45d7c2d11db
parent9ec4ecef0af7790551109283ca039a7c52de343c
x86: kexec_file: purge system-ram walking from prepare_elf64_headers()

While prepare_elf64_headers() in x86 looks pretty generic for other
architectures' use, it contains some code which tries to list crash
memory regions by walking through system resources, which is not always
architecture agnostic.  To make this function more generic, the related
code should be purged.

In this patch, prepare_elf64_headers() simply scans crash_mem buffer
passed and add all the listed regions to elf header as a PT_LOAD
segment.  So walk_system_ram_res(prepare_elf64_headers_callback) have
been moved forward before prepare_elf64_headers() where the callback,
prepare_elf64_headers_callback(), is now responsible for filling up
crash_mem buffer.

Meanwhile exclude_elf_header_ranges() used to be called every time in
this callback it is rather redundant and now called only once in
prepare_elf_headers() as well.

Link: http://lkml.kernel.org/r/20180306102303.9063-4-takahiro.akashi@linaro.org
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Acked-by: Dave Young <dyoung@redhat.com>
Tested-by: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/x86/kernel/crash.c