From d71415e88447f31ec63026e69b64a7e99465b7f4 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 14 Sep 2010 19:35:00 +0000 Subject: [PATCH] sh: kill big kernel lock 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 Signed-off-by: Paul Mundt --- arch/sh/kernel/ptrace_64.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c index b97817016b6a..e0fb065914aa 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 @@ -474,10 +474,9 @@ 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 @@ -487,9 +486,7 @@ 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); } -- 2.39.5