#!/usr/bin/perl -w # use strict; use Math::BigInt; use Fcntl "SEEK_SET"; die "Format: $0 [-s ] \n" if ($#ARGV != 1 && $#ARGV != 3 || $#ARGV == 3 && $ARGV[0] ne "-s"); my $sysmap = ""; if ($#ARGV == 3) { shift; $sysmap = $ARGV[0]; shift; } my $vmlinux = $ARGV[0]; my $keyring = $ARGV[1]; # # Parse the vmlinux section table # open FD, "objdump -h $vmlinux |" || die $vmlinux; my @lines = ; close(FD) || die $vmlinux; my @sections = (); foreach my $line (@lines) { chomp($line); if ($line =~ /\s*([0-9]+)\s+(\S+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+2[*][*]([0-9]+)/ ) { my $seg = $1; my $name = $2; my $len = Math::BigInt->new("0x" . $3); my $vma = Math::BigInt->new("0x" . $4); my $lma = Math::BigInt->new("0x" . $5); my $foff = Math::BigInt->new("0x" . $6); my $align = 2 ** $7; push @sections, { name => $name, vma => $vma, len => $len, foff => $foff }; } } print "Have $#sections sections\n"; # # Try and parse the vmlinux symbol table. If the vmlinux file has been created # from a vmlinuz file with extract-vmlinux then the symbol table will be empty. # open FD, "nm $vmlinux 2>/dev/null |" || die $vmlinux; @lines = ; close(FD) || die $vmlinux; my %symbols = (); my $nr_symbols = 0; sub parse_symbols(@) { foreach my $line (@_) { chomp($line); if ($line =~ /([0-9a-f]+)\s([a-zA-Z])\s(\S+)/ ) { my $addr = "0x" . $1; my $type = $2; my $name = $3; $symbols{$name} = $addr; $nr_symbols++; } } } parse_symbols(@lines); if ($nr_symbols == 0 && $sysmap ne "") { print "No symbols in vmlinux, trying $sysmap\n"; open FD, "<$sysmap" || die $sysmap; @lines = ; close(FD) || die $sysmap; parse_symbols(@lines); } die "No symbols available\n" if ($nr_symbols == 0); print "Have $nr_symbols symbols\n"; die "Can't find system certificate list" unless (exists($symbols{"__cert_list_start"}) && exists($symbols{"system_certificate_list_size"})); my $start = Math::BigInt->new($symbols{"__cert_list_start"}); my $end; my $size; my $size_sym = Math::BigInt->new($symbols{"system_certificate_list_size"}); open FD, "<$vmlinux" || die $vmlinux; binmode(FD); my $s = undef; foreach my $sec (@sections) { my $s_name = $sec->{name}; my $s_vma = $sec->{vma}; my $s_len = $sec->{len}; my $s_foff = $sec->{foff}; my $s_vend = $s_vma + $s_len; next unless ($start >= $s_vma); next if ($start >= $s_vend); die "Certificate list size was not found on the same section\n" if ($size_sym < $s_vma || $size_sym > $s_vend); die "Cert object in multiple sections: ", $s_name, " and ", $s->{name}, "\n" if ($s); my $size_off = $size_sym -$s_vma + $s_foff; my $packed; die $vmlinux if (!defined(sysseek(FD, $size_off, SEEK_SET))); sysread(FD, $packed, 8); $size = unpack 'L!', $packed; $end = $start + $size; printf "Have %u bytes of certs at VMA 0x%x\n", $size, $start; die "Cert object partially overflows section $s_name\n" if ($end > $s_vend); $s = $sec; } die "Cert object not inside a section\n" unless ($s); print "Certificate list in section ", $s->{name}, "\n"; my $foff = $start - $s->{vma} + $s->{foff}; printf "Certificate list at file offset 0x%x\n", $foff; die $vmlinux if (!defined(sysseek(FD, $foff, SEEK_SET))); my $buf = ""; my $len = sysread(FD, $buf, $size); die "$vmlinux" if (!defined($len)); die "Short read on $vmlinux\n" if ($len != $size); close(FD) || die $vmlinux; open FD, ">$keyring" || die $keyring; binmode(FD); $len = syswrite(FD, $buf, $size); die "$keyring" if (!defined($len)); die "Short write on $keyring\n" if ($len != $size); close(FD) || die $keyring; alue='40'>40space:mode:
authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /sound/isa/wss
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'sound/isa/wss')