From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755172Ab0INTkl (ORCPT ); Tue, 14 Sep 2010 15:40:41 -0400 Received: from moutng.kundenserver.de ([212.227.17.9]:56159 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755134Ab0INTka (ORCPT ); Tue, 14 Sep 2010 15:40:30 -0400 From: Arnd Bergmann To: linux-kernel@vger.kernel.org Subject: [PATCH 09/18] sh: kill big kernel lock Date: Tue, 14 Sep 2010 21:40:13 +0200 Message-Id: <1284493213-7263-10-git-send-email-arnd@arndb.de> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1284493139-7233-1-git-send-email-arnd@arndb.de> References: <1284493139-7233-1-git-send-email-arnd@arndb.de> X-Provags-ID: V02:K0:xhBZrOxqfdFPmIvnkzbgxG9v8uQmPQGv18LyHpIfKSt IobZT1+2K7H/egH/qMKGLhmmgQJtHH8RZOumqPIF0XF0usomm8 EBz1lICQKYQMqPthbJOpmpvbG0592xsp837WSQ7pLivjw+BOCJ m7SoTb9YOSX5+yff0G9RW0JRvEaO0hPnZuap6dPtOklonGV4NJ Ui9aNKrsg7i/JYlQSSG6g== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The only BKL user in arch/sh protects a single bit, so we can trivially replace it with test_and_set_bit. Signed-off-by: Arnd Bergmann Cc: Paul Mundt Cc: linux-sh@vger.kernel.org --- arch/sh/kernel/ptrace_64.c | 9 +++------ 1 files changed, 3 insertions(+), 6 deletions(-) diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c index 5fd644d..178b6b0 100644 --- a/arch/sh/kernel/ptrace_64.c +++ b/arch/sh/kernel/ptrace_64.c @@ -20,7 +20,7 @@ #include #include #include -#include +#include #include #include #include @@ -395,10 +395,9 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) asmlinkage int sh64_ptrace(long request, long pid, long addr, long data) { #define WPC_DBRMODE 0x0d104008 - static int first_call = 1; + static unsigned long first_call; - lock_kernel(); - if (first_call) { + if (!test_and_set_bit(0, &first_call)) { /* Set WPC.DBRMODE to 0. This makes all debug events get * delivered through RESVEC, i.e. into the handlers in entry.S. * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE @@ -408,9 +407,7 @@ asmlinkage int sh64_ptrace(long request, long pid, long addr, long data) * the remote gdb.) */ printk("DBRMODE set to 0 to permit native debugging\n"); poke_real_address_q(WPC_DBRMODE, 0); - first_call = 0; } - unlock_kernel(); return sys_ptrace(request, pid, addr, data); } -- 1.7.1