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Subject[tip:x86/debug] x86/kgdb: Replace bool_int_array[NR_CPUS] with bitmap
Commit-ID:  0d44975d1e2791f6df2b84b182f49d815ba3c9e0
Gitweb: http://git.kernel.org/tip/0d44975d1e2791f6df2b84b182f49d815ba3c9e0
Author: Denys Vlasenko <dvlasenk@redhat.com>
AuthorDate: Sat, 26 Sep 2015 14:47:17 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 28 Sep 2015 10:13:31 +0200

x86/kgdb: Replace bool_int_array[NR_CPUS] with bitmap

Straigntforward conversion from:

int was_in_debug_nmi[NR_CPUS]

to:

DECLARE_BITMAP(was_in_debug_nmi, NR_CPUS)

Saves about 2 kbytes in BSS for NR_CPUS=512.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1443271638-2568-1-git-send-email-dvlasenk@redhat.com
[ Tidied up the code a bit. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/kgdb.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index d6178d9..44256a6 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -511,26 +511,31 @@ single_step_cont(struct pt_regs *regs, struct die_args *args)
return NOTIFY_STOP;
}

-static int was_in_debug_nmi[NR_CPUS];
+static DECLARE_BITMAP(was_in_debug_nmi, NR_CPUS);

static int kgdb_nmi_handler(unsigned int cmd, struct pt_regs *regs)
{
+ int cpu;
+
switch (cmd) {
case NMI_LOCAL:
if (atomic_read(&kgdb_active) != -1) {
/* KGDB CPU roundup */
- kgdb_nmicallback(raw_smp_processor_id(), regs);
- was_in_debug_nmi[raw_smp_processor_id()] = 1;
+ cpu = raw_smp_processor_id();
+ kgdb_nmicallback(cpu, regs);
+ set_bit(cpu, was_in_debug_nmi);
touch_nmi_watchdog();
+
return NMI_HANDLED;
}
break;

case NMI_UNKNOWN:
- if (was_in_debug_nmi[raw_smp_processor_id()]) {
- was_in_debug_nmi[raw_smp_processor_id()] = 0;
+ cpu = raw_smp_processor_id();
+
+ if (__test_and_clear_bit(cpu, was_in_debug_nmi))
return NMI_HANDLED;
- }
+
break;
default:
/* do nothing */

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