linux-kernel - [sparc64] unable to build kernel after bbfceba15f8 / "kdb: Get rid of confusing diag msg from "rd" if current task has no regs"

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Date:   Wed, 5 Feb 2020 00:14:46 +0300
From:   Anatoly Pugachev <matorola@...il.com>
To:     Sparc kernel list <sparclinux@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     Linux Kernel list <linux-kernel@...r.kernel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: [sparc64] unable to build kernel after bbfceba15f8 / "kdb: Get rid of
 confusing diag msg from "rd" if current task has no regs"

Hello!

After (bisected) bbfceba15f8d1260c328a254efc2b3f2deae4904 got
mainline, i'm unable to build kernel with the following messages:

~/linux-2.6$ make -j olddefconfig; make kernel/debug/kdb/
scripts/kconfig/conf  --olddefconfig Kconfig
#
# No change to .config
#
  CALL    scripts/atomic/check-atomics.sh
  CALL    scripts/checksyscalls.sh
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
  CC      kernel/debug/kdb/kdb_main.o
kernel/debug/kdb/kdb_main.c: In function ‘kdb_rd’:
kernel/debug/kdb/kdb_main.c:1857:11: error: ‘dbg_reg_def’ undeclared
(first use in this function); did you mean ‘dbg_reg_def_t’?
 1857 |   rsize = dbg_reg_def[i].size * 2;
      |           ^~~~~~~~~~~
      |           dbg_reg_def_t
kernel/debug/kdb/kdb_main.c:1857:11: note: each undeclared identifier
is reported only once for each function it appears in
kernel/debug/kdb/kdb_main.c:1868:12: error: implicit declaration of
function ‘dbg_get_reg’ [-Werror=implicit-function-declaration]
 1868 |    rname = dbg_get_reg(i, &reg8, kdb_current_regs);
      |            ^~~~~~~~~~~
kernel/debug/kdb/kdb_main.c:1868:10: warning: assignment to ‘char *’
from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
 1868 |    rname = dbg_get_reg(i, &reg8, kdb_current_regs);
      |          ^
kernel/debug/kdb/kdb_main.c:1874:10: warning: assignment to ‘char *’
from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
 1874 |    rname = dbg_get_reg(i, &reg16, kdb_current_regs);
      |          ^
kernel/debug/kdb/kdb_main.c:1880:10: warning: assignment to ‘char *’
from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
 1880 |    rname = dbg_get_reg(i, &reg32, kdb_current_regs);
      |          ^
kernel/debug/kdb/kdb_main.c:1886:10: warning: assignment to ‘char *’
from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
 1886 |    rname = dbg_get_reg(i, &reg64, kdb_current_regs);
      |          ^
cc1: some warnings being treated as errors
make[3]: *** [scripts/Makefile.build:266: kernel/debug/kdb/kdb_main.o] Error 1
make[2]: *** [scripts/Makefile.build:503: kernel/debug/kdb] Error 2
make[1]: *** [scripts/Makefile.build:503: kernel/debug] Error 2
make: *** [Makefile:1681: kernel] Error 2


reversing bbfceba15f8d with current git master branch - makes kernel
compilable again.

kernel config attached

View attachment "sparc64-kernel-config.txt" of type "text/plain" (66679 bytes)