diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2010-09-14 19:35:00 +0000 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-09-16 16:37:56 +0900 |
| commit | d71415e88447f31ec63026e69b64a7e99465b7f4 (patch) | |
| tree | 426a7a163380328c051aa36544b9add771720054 /arch/sh/kernel | |
| parent | 5d75b3a2476d848a354d939d2b89c36d3394ac59 (diff) | |
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 <arnd@arndb.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
| -rw-r--r-- | 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 b97817016b6a..e0fb065914aa 100644 --- a/arch/sh/kernel/ptrace_64.c +++ b/arch/sh/kernel/ptrace_64.c @@ -20,7 +20,7 @@ #include <linux/sched.h> #include <linux/mm.h> #include <linux/smp.h> -#include <linux/smp_lock.h> +#include <linux/bitops.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/user.h> @@ -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); } |