From: Rob Landley <rob@xxxxxxxxxxx>
Commit e6023367d779 ("x86, kaslr: Prevent .bss from overlaping initrd")
added perl back to the kernel build dependencies in -rc6.
Replace those 39 lines of perl with 4 lines of shell script.
Signed-off-by: Rob Landley <rob@xxxxxxxxxxx>
Acked-by: Anca Emanuel <anca.emanuel@xxxxxxxxx>
---
arch/x86/boot/compressed/Makefile | 6 ++--
arch/x86/tools/calc_run_size.pl | 39 ----------------------------
2 files changed, 4 insertions(+), 41 deletions(-)
Note: checkpatch.pl isn't a build dependency, it's a development dependency
(like bloat-o-meter being written in python or "make xconfig" needing QT).
Those aren't things you need to add to your cross compile environment
to produce a binary. Different category of dependency.
For more history on the issue, see https://lkml.org/lkml/2013/2/27/18
--- linux/arch/x86/boot/compressed/Makefile
+++ linux/arch/x86/boot/compressed/Makefile
@@ -89,8 +76,10 @@
suffix-$(CONFIG_KERNEL_LZO) := lzo
suffix-$(CONFIG_KERNEL_LZ4) := lz4
-RUN_SIZE = $(shell $(OBJDUMP) -h vmlinux | \
- perl $(srctree)/arch/x86/tools/calc_run_size.pl)
+RUN_SIZE = $(shell NUM='\([0-9a-fA-F]*[ \t]*\)'; $(OBJDUMP) -h vmlinux | \
+sed -n 's/^[ \t0-9]*.b[sr][sk][ \t]*'"$$NUM$$NUM$$NUM$$NUM"'.*/\1\4/p' | \
+xargs | while read a b c d; do [ "$$b" != "$$d" ] && exit 1; \
+expr $$(printf "%d + %d + %d" 0x$$a 0x$$b 0x$$c); done)
quiet_cmd_mkpiggy = MKPIGGY $@
cmd_mkpiggy = $(obj)/mkpiggy $< $(RUN_SIZE) > $@ || ( rm -f $@ ; false )
--- linux/arch/x86/tools/calc_run_size.pl
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/usr/bin/perl
-#
-# Calculate the amount of space needed to run the kernel, including room for
-# the .bss and .brk sections.
-#
-# Usage:
-# objdump -h a.out | perl calc_run_size.pl
-use strict;
-
-my $mem_size = 0;
-my $file_offset = 0;
-
-my $sections=" *[0-9]+ \.(?:bss|brk) +";
-while (<>) {
- if (/^$sections([0-9a-f]+) +(?:[0-9a-f]+ +){2}([0-9a-f]+)/) {
- my $size = hex($1);
- my $offset = hex($2);
- $mem_size += $size;
- if ($file_offset == 0) {
- $file_offset = $offset;
- } elsif ($file_offset != $offset) {
- # BFD linker shows the same file offset in ELF.
- # Gold linker shows them as consecutive.
- next if ($file_offset + $mem_size == $offset + $size);
-
- printf STDERR "file_offset: 0x%lx\n", $file_offset;
- printf STDERR "mem_size: 0x%lx\n", $mem_size;
- printf STDERR "offset: 0x%lx\n", $offset;
- printf STDERR "size: 0x%lx\n", $size;
-
- die ".bss and .brk are non-contiguous\n";
- }
- }
-}
-
-if ($file_offset == 0) {
- die "Never found .bss or .brk file offset\n";
-}
-printf("%d\n", $mem_size + $file_offset);
--
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