[CPUFREQ] Refactor locking in cpufreq_add_dev

[safe/jmp/linux-2.6] / kernel / kgdb.c

diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 85b7e5b..1bd0ec1 100644 (file)
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -561,18 +561,6 @@ static void kgdb_wait(struct pt_regs *regs)
        smp_wmb();
        atomic_set(&cpu_in_kgdb[cpu], 1);
 
-       /*
-        * The primary CPU must be active to enter here, but this is
-        * guard in case the primary CPU had not been selected if
-        * this was an entry via nmi.
-        */
-       while (atomic_read(&kgdb_active) == -1)
-               cpu_relax();
-
-       /* Wait till primary CPU goes completely into the debugger. */
-       while (!atomic_read(&cpu_in_kgdb[atomic_read(&kgdb_active)]))
-               cpu_relax();
-
        /* Wait till primary CPU is done with debugging */
        while (atomic_read(&passive_cpu_wait[cpu]))
                cpu_relax();
@@ -603,9 +591,9 @@ static void kgdb_flush_swbreak_addr(unsigned long addr)
        if (current->mm && current->mm->mmap_cache) {
                flush_cache_range(current->mm->mmap_cache,
                                  addr, addr + BREAK_INSTR_SIZE);
-       } else {
-               flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
        }
+       /* Force flush instruction cache if it was outside the mm */
+       flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
 }
 
 /*
@@ -1447,18 +1435,18 @@ acquirelock:
                        atomic_set(&passive_cpu_wait[i], 1);
        }
 
-#ifdef CONFIG_SMP
-       /* Signal the other CPUs to enter kgdb_wait() */
-       if ((!kgdb_single_step || !kgdb_contthread) && kgdb_do_roundup)
-               kgdb_roundup_cpus(flags);
-#endif
-
        /*
         * spin_lock code is good enough as a barrier so we don't
         * need one here:
         */
        atomic_set(&cpu_in_kgdb[ks->cpu], 1);
 
+#ifdef CONFIG_SMP
+       /* Signal the other CPUs to enter kgdb_wait() */
+       if ((!kgdb_single_step || !kgdb_contthread) && kgdb_do_roundup)
+               kgdb_roundup_cpus(flags);
+#endif
+
        /*
         * Wait for the other CPUs to be notified and be waiting for us:
         */
@@ -1514,7 +1502,8 @@ int kgdb_nmicallback(int cpu, void *regs)
 {
 #ifdef CONFIG_SMP
        if (!atomic_read(&cpu_in_kgdb[cpu]) &&
-                       atomic_read(&kgdb_active) != cpu) {
+                       atomic_read(&kgdb_active) != cpu &&
+                       atomic_read(&cpu_in_kgdb[atomic_read(&kgdb_active)])) {
                kgdb_wait((struct pt_regs *)regs);
                return 0;
        }