Commit d71415e8 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Paul Mundt
Browse files

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: default avatarArnd Bergmann <arnd@arndb.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 5d75b3a2

arch/sh/kernel/ptrace_64.c

+3 −6
Original line number Diff line number Diff line
@@ -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);

}