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sh: kill big kernel lock

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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>
This commit is contained in:
Arnd Bergmann 2010-09-14 19:35:00 +00:00 committed by Paul Mundt
parent 5d75b3a247
commit d71415e884
1 changed files with 3 additions and 6 deletions
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9
arch/sh/kernel/ptrace_64.c
View file

@ -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);
}