Messages in this thread | | | Date | Thu, 19 Feb 2009 16:55:27 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] [kgdb] Switch master cpu after gdb thread command for SMP (v4) |
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On Wed, 18 Feb 2009 17:37:54 +0800 sonic zhang <sonic.adi@gmail.com> wrote:
> This is the updated kgdb SMP patch, which is tested on blackfin bf561 dual core > system. A new bug is fixed, which causes debugging halt in SMP kernel if a > breakpoint is hit and cpu is switched in gdb before continue running kernel. > > In blackfin SMP architecture, different core has its own L1 SRAM and MMR > memory, which code running on the other core can't access. In current kgdb > impelemntation, cpus are represented by thread with minus prefix. > > If user run thread command in gdb to switch to the thread of the other cpu, > kgdb should: > 1. send IPI signal to master cpu > 2. release the specific passive cpu waiting in IPI handler > 3. exit kgdb exception loop on master cpu and trap into kgdb wait in IPI handler > 4. trap the released passive cpu into kgdb exception in IPI handler >
x86_64 allmodconfig:
kernel/kgdb.c: In function 'kgdb_wait': kernel/kgdb.c:589: error: 'KGDB_THR_PROC_SWAP' undeclared (first use in this function) kernel/kgdb.c:589: error: (Each undeclared identifier is reported only once kernel/kgdb.c:589: error: for each function it appears in.) kernel/kgdb.c: In function 'gdb_cmd_query': kernel/kgdb.c:1087: error: 'KGDB_THR_PROC_SWAP' undeclared (first use in this function) kernel/kgdb.c: In function 'gdb_cmd_task': kernel/kgdb.c:1113: error: 'KGDB_THR_PROC_SWAP' undeclared (first use in this function) kernel/kgdb.c: In function 'gdb_cmd_thread': kernel/kgdb.c:1163: error: 'KGDB_THR_PROC_SWAP' undeclared (first use in this function) kernel/kgdb.c: In function 'gdb_serial_stub': kernel/kgdb.c:1275: error: 'KGDB_THR_PROC_SWAP' undeclared (first use in this function) kernel/kgdb.c: In function 'kgdb_handle_exception': kernel/kgdb.c:1575: error: 'KGDB_THR_PROC_SWAP' undeclared (first use in this function) kernel/kgdb.c: In function 'kgdb_nmicallback': kernel/kgdb.c:1606: warning: suggest parentheses around && within || kernel/kgdb.c:1606: warning: suggest parentheses around && within || kernel/kgdb.c:1606: warning: suggest parentheses around && within ||
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