Revision 966a0acce2fca776391823381dba95c40e03c339 authored by Sami Tolvanen on 30 July 2020, 15:37:01 UTC, committed by Will Deacon on 30 July 2020, 15:50:14 UTC
Commit f7b93d42945c ("arm64/alternatives: use subsections for replacement sequences") breaks LLVM's integrated assembler, because due to its one-pass design, it cannot compute instruction sequence lengths before the layout for the subsection has been finalized. This change fixes the build by moving the .org directives inside the subsection, so they are processed after the subsection layout is known. Fixes: f7b93d42945c ("arm64/alternatives: use subsections for replacement sequences") Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Link: https://github.com/ClangBuiltLinux/linux/issues/1078 Link: https://lore.kernel.org/r/20200730153701.3892953-1-samitolvanen@google.com Signed-off-by: Will Deacon <will@kernel.org>
1 parent 7b7891c
stackdelta
#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
# Read two files produced by the stackusage script, and show the
# delta between them.
#
# Currently, only shows changes for functions listed in both files. We
# could add an option to show also functions which have vanished or
# appeared (which would often be due to gcc making other inlining
# decisions).
#
# Another possible option would be a minimum absolute value for the
# delta.
#
# A third possibility is for sorting by delta, but that can be
# achieved by piping to sort -k5,5g.
sub read_stack_usage_file {
my %su;
my $f = shift;
open(my $fh, '<', $f)
or die "cannot open $f: $!";
while (<$fh>) {
chomp;
my ($file, $func, $size, $type) = split;
# Old versions of gcc (at least 4.7) have an annoying quirk in
# that a (static) function whose name has been changed into
# for example ext4_find_unwritten_pgoff.isra.11 will show up
# in the .su file with a name of just "11". Since such a
# numeric suffix is likely to change across different
# commits/compilers/.configs or whatever else we're trying to
# tweak, we can't really track those functions, so we just
# silently skip them.
#
# Newer gcc (at least 5.0) report the full name, so again,
# since the suffix is likely to change, we strip it.
next if $func =~ m/^[0-9]+$/;
$func =~ s/\..*$//;
# Line numbers are likely to change; strip those.
$file =~ s/:[0-9]+$//;
$su{"${file}\t${func}"} = {size => $size, type => $type};
}
close($fh);
return \%su;
}
@ARGV == 2
or die "usage: $0 <old> <new>";
my $old = read_stack_usage_file($ARGV[0]);
my $new = read_stack_usage_file($ARGV[1]);
my @common = sort grep {exists $new->{$_}} keys %$old;
for (@common) {
my $x = $old->{$_}{size};
my $y = $new->{$_}{size};
my $delta = $y - $x;
if ($delta) {
printf "%s\t%d\t%d\t%+d\n", $_, $x, $y, $delta;
}
}
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