[PATCH 1/1] powerpc/kgdb: use DEFINE_PER_CPU to allocate kgdb's thread_info
From: Tiejun Chen <hidden>
Date: 2013-03-11 10:09:52
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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 <redacted> --- arch/powerpc/kernel/kgdb.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 1a57307..cde7818 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c@@ -151,15 +151,15 @@ 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 = (struct 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 +185,6 @@ 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; }
--
1.7.9.5