mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d6c9708737
lx-dmesg needs access to the log_buf symbol from printk.c. Unfortunately, the symbol log_buf also exists in BPF's verifier.c and hence gdb can pick one or the other. If it happens to pick BPF's log_buf, lx-dmesg doesn't work: (gdb) lx-dmesg Python Exception <class 'gdb.MemoryError'> Cannot access memory at address 0x0: Error occurred in Python command: Cannot access memory at address 0x0 (gdb) p log_buf $15 = 0x0 Luckily, GDB has a way to deal with this, see https://sourceware.org/gdb/onlinedocs/gdb/Symbols.html (gdb) info variables ^log_buf$ All variables matching regular expression "^log_buf$": File <linux.git>/kernel/bpf/verifier.c: static char *log_buf; File <linux.git>/kernel/printk/printk.c: static char *log_buf; (gdb) p 'verifier.c'::log_buf $1 = 0x0 (gdb) p 'printk.c'::log_buf $2 = 0x811a6aa0 <__log_buf> "" (gdb) p &log_buf $3 = (char **) 0x8120fe40 <log_buf> (gdb) p &'verifier.c'::log_buf $4 = (char **) 0x8120fe40 <log_buf> (gdb) p &'printk.c'::log_buf $5 = (char **) 0x8048b7d0 <log_buf> By being explicit about the location of the symbol, we can make lx-dmesg work again. While at it, do the same for the other symbols we need from printk.c Link: http://lkml.kernel.org/r/20170526112222.3414-1-git@andred.net Signed-off-by: André Draszik <git@andred.net> Tested-by: Kieran Bingham <kieran@bingham.xyz> Acked-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
basic | ||
coccinelle | ||
dtc | ||
gcc-plugins | ||
gdb | ||
genksyms | ||
kconfig | ||
ksymoops | ||
mod | ||
package | ||
selinux | ||
tracing | ||
.gitignore | ||
adjust_autoksyms.sh | ||
asn1_compiler.c | ||
bloat-o-meter | ||
bootgraph.pl | ||
check_00index.sh | ||
check_extable.sh | ||
check-lc_ctype.c | ||
checkincludes.pl | ||
checkkconfigsymbols.py | ||
checkpatch.pl | ||
checkstack.pl | ||
checksyscalls.sh | ||
checkversion.pl | ||
cleanfile | ||
cleanpatch | ||
coccicheck | ||
config | ||
conmakehash.c | ||
const_structs.checkpatch | ||
decode_stacktrace.sh | ||
decodecode | ||
depmod.sh | ||
diffconfig | ||
docproc.c | ||
export_report.pl | ||
extract_xc3028.pl | ||
extract-cert.c | ||
extract-ikconfig | ||
extract-module-sig.pl | ||
extract-sys-certs.pl | ||
extract-vmlinux | ||
faddr2line | ||
gcc-goto.sh | ||
gcc-ld | ||
gcc-plugin.sh | ||
gcc-version.sh | ||
gcc-x86_32-has-stack-protector.sh | ||
gcc-x86_64-has-stack-protector.sh | ||
gen_initramfs_list.sh | ||
get_dvb_firmware | ||
get_maintainer.pl | ||
gfp-translate | ||
headerdep.pl | ||
headers_check.pl | ||
headers_install.sh | ||
headers.sh | ||
insert-sys-cert.c | ||
kallsyms.c | ||
Kbuild.include | ||
kernel-doc | ||
kernel-doc-xml-ref | ||
ld-version.sh | ||
Lindent | ||
link-vmlinux.sh | ||
Makefile | ||
Makefile.asm-generic | ||
Makefile.build | ||
Makefile.clean | ||
Makefile.dtbinst | ||
Makefile.extrawarn | ||
Makefile.fwinst | ||
Makefile.gcc-plugins | ||
Makefile.headersinst | ||
Makefile.help | ||
Makefile.host | ||
Makefile.kasan | ||
Makefile.lib | ||
Makefile.modbuiltin | ||
Makefile.modinst | ||
Makefile.modpost | ||
Makefile.modsign | ||
Makefile.ubsan | ||
makelst | ||
markup_oops.pl | ||
mkcompile_h | ||
mkmakefile | ||
mksysmap | ||
mkuboot.sh | ||
mkversion | ||
module-common.lds | ||
namespace.pl | ||
objdiff | ||
patch-kernel | ||
pnmtologo.c | ||
profile2linkerlist.pl | ||
prune-kernel | ||
recordmcount.c | ||
recordmcount.h | ||
recordmcount.pl | ||
setlocalversion | ||
show_delta | ||
sign-file.c | ||
sortextable.c | ||
sortextable.h | ||
spelling.txt | ||
stackdelta | ||
stackusage | ||
tags.sh | ||
unifdef.c | ||
ver_linux | ||
xen-hypercalls.sh | ||
xz_wrap.sh |