Merge tag 'disintegrate-mtd-20121009' of git://git.infradead.org/users/dhowells/linux-headers

UAPI Disintegration 2012-10-09

Conflicts:
	MAINTAINERS
	arch/arm/configs/bcmring_defconfig
	arch/arm/mach-imx/clk-imx51-imx53.c
	drivers/mtd/nand/Kconfig
	drivers/mtd/nand/bcm_umi_nand.c
	drivers/mtd/nand/nand_bcm_umi.h
	drivers/mtd/nand/orion_nand.c

2 files changed, 42 insertions, 3 deletions

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 0557f24c6bca..17e073c309e6 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -672,6 +672,10 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
 {
         struct kgdb_state kgdb_var;
         struct kgdb_state *ks = &kgdb_var;
+        int ret = 0;
+
+        if (arch_kgdb_ops.enable_nmi)
+                arch_kgdb_ops.enable_nmi(0);
 
         ks->cpu                 = raw_smp_processor_id();
         ks->ex_vector           = evector;
@@ -681,11 +685,15 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
         ks->linux_regs          = regs;
 
         if (kgdb_reenter_check(ks))
-                return 0; /* Ouch, double exception ! */
+                goto out; /* Ouch, double exception ! */
         if (kgdb_info[ks->cpu].enter_kgdb != 0)
-                return 0;
+                goto out;
 
-        return kgdb_cpu_enter(ks, regs, DCPU_WANT_MASTER);
+        ret = kgdb_cpu_enter(ks, regs, DCPU_WANT_MASTER);
+out:
+        if (arch_kgdb_ops.enable_nmi)
+                arch_kgdb_ops.enable_nmi(1);
+        return ret;
 }
 
 int kgdb_nmicallback(int cpu, void *regs)
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 31df1706b9a9..1261dc7eaeb9 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -21,6 +21,7 @@
 #include <linux/smp.h>
 #include <linux/utsname.h>
 #include <linux/vmalloc.h>
+#include <linux/atomic.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/init.h>
@@ -2107,6 +2108,32 @@ static int kdb_dmesg(int argc, const char **argv)
         return 0;
 }
 #endif /* CONFIG_PRINTK */
+
+/* Make sure we balance enable/disable calls, must disable first. */
+static atomic_t kdb_nmi_disabled;
+
+static int kdb_disable_nmi(int argc, const char *argv[])
+{
+        if (atomic_read(&kdb_nmi_disabled))
+                return 0;
+        atomic_set(&kdb_nmi_disabled, 1);
+        arch_kgdb_ops.enable_nmi(0);
+        return 0;
+}
+
+static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
+{
+        if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
+                return -EINVAL;
+        arch_kgdb_ops.enable_nmi(1);
+        return 0;
+}
+
+static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
+        .set = kdb_param_enable_nmi,
+};
+module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
+
 /*
  * kdb_cpu - This function implements the 'cpu' command.
  *      cpu     [<cpunum>]
@@ -2851,6 +2878,10 @@ static void __init kdb_inittab(void)
         kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
           "Display syslog buffer", 0, KDB_REPEAT_NONE);
 #endif
+        if (arch_kgdb_ops.enable_nmi) {
+                kdb_register_repeat("disable_nmi", kdb_disable_nmi, "",
+                  "Disable NMI entry to KDB", 0, KDB_REPEAT_NONE);
+        }
         kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
           "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
         kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",