arch: tile: kernel: kgdb.c: Use memcpy() instead of pointer copy one by one

Not only memcpy() is faster than pointer copy, but also let code more
clearer and simple, which can avoid compiling warning (the original
implementation copy registers by exceeding member array border).

The related warning (with allmodconfig under tile):

    CC      arch/tile/kernel/kgdb.o
  arch/tile/kernel/kgdb.c: In function 'sleeping_thread_to_gdb_regs':
  arch/tile/kernel/kgdb.c:140:31: warning: iteration 53u invokes undefined behavior [-Waggressive-loop-optimizations]
     *(ptr++) = thread_regs->regs[reg];
                                 ^
  arch/tile/kernel/kgdb.c:139:2: note: containing loop
    for (reg = 0; reg <= TREG_LAST_GPR; reg++)
    ^

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>

diff --git a/arch/tile/kernel/kgdb.c b/arch/tile/kernel/kgdb.c
index 4cd88381a83e5e0bca9b6e65edc1912078c95d12..ff5335ae050d475dcff52fb0a53c484abaee6a56 100644 (file)
--- a/arch/tile/kernel/kgdb.c
+++ b/arch/tile/kernel/kgdb.c
@@ -125,9 +125,7 @@ int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
 void
 sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
 {
-       int reg;
        struct pt_regs *thread_regs;
-       unsigned long *ptr = gdb_regs;
 
        if (task == NULL)
                return;
@@ -136,9 +134,7 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
        memset(gdb_regs, 0, NUMREGBYTES);
 
        thread_regs = task_pt_regs(task);
-       for (reg = 0; reg <= TREG_LAST_GPR; reg++)
-               *(ptr++) = thread_regs->regs[reg];
-
+       memcpy(gdb_regs, thread_regs, TREG_LAST_GPR * sizeof(unsigned long));
        gdb_regs[TILEGX_PC_REGNUM] = thread_regs->pc;
        gdb_regs[TILEGX_FAULTNUM_REGNUM] = thread_regs->faultnum;
 }