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

    On Tue, Feb 4, 2020 at 1:14 PM Anatoly Pugachev <matorola@gmail.com> wrote:
    >
    > 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

    Argh. Sorry about this. :( I'm not setup with a sparc compiler, but
    I've simulated your results on arm64 by just commenting out the
    definition of "DBG_MAX_REG_NUM" in "arch/arm64/include/asm/kgdb.h".
    Hopefully:

    https://lore.kernel.org/r/20200204141219.1.Ief3f3a7edbbd76165901b14813e90381c290786d@changeid

    ...will fix you?

    -Doug

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