From: Tiejun Chen Date: Thu, 20 Jun 2013 10:28:29 +0000 (+0800) Subject: powerpc/kgdb: use DEFINE_PER_CPU to allocate kgdb's thread_info X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8258e268c15a29c09d7c88d91a948bdf729433d8;p=openwrt%2Fstaging%2Fblogic.git powerpc/kgdb: use DEFINE_PER_CPU to allocate kgdb's thread_info Use DEFINE_PER_CPU to allocate thread_info statically instead of kmalloc(). This can avoid introducing more memory check codes. Signed-off-by: Tiejun Chen [scottwood@freescale.com: wrapped long line] Signed-off-by: Scott Wood --- diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c index c1eef241017a..83e89d310734 100644 --- a/arch/powerpc/kernel/kgdb.c +++ b/arch/powerpc/kernel/kgdb.c @@ -151,15 +151,16 @@ static int kgdb_handle_breakpoint(struct pt_regs *regs) return 1; } +static DEFINE_PER_CPU(struct thread_info, kgdb_thread_info); static int kgdb_singlestep(struct pt_regs *regs) { struct thread_info *thread_info, *exception_thread_info; - struct thread_info *backup_current_thread_info; + struct thread_info *backup_current_thread_info = + &__get_cpu_var(kgdb_thread_info); if (user_mode(regs)) return 0; - backup_current_thread_info = kmalloc(sizeof(struct thread_info), GFP_KERNEL); /* * On Book E and perhaps other processors, singlestep is handled on * the critical exception stack. This causes current_thread_info() @@ -185,7 +186,6 @@ static int kgdb_singlestep(struct pt_regs *regs) /* Restore current_thread_info lastly. */ memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info); - kfree(backup_current_thread_info); return 1; }