From 8c9843e57a7d9d7a090d6467a0f1f3afb8031527 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 18 Apr 2008 16:56:15 +1000
Subject: [PATCH] [POWERPC] Add thread_info_cache_init() weak hook
Some architectures need to maintain a kmem cache for thread info
structures. The next commit adds that to powerpc to fix an alignment
problem.
There is no good arch callback to use to initialize that cache
that I can find, so this adds a new one in the form of a weak
function whose default is empty.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---
include/linux/sched.h | 2 ++
init/main.c | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 311380e5fe8..d0bd97044ab 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1926,6 +1926,8 @@ static inline unsigned long *end_of_stack(struct task_struct *p)
#endif
+extern void thread_info_cache_init(void);
+
/* set thread flags in other task's structures
* - see asm/thread_info.h for TIF_xxxx flags available
*/
diff --git a/init/main.c b/init/main.c
index 833a67df1f7..507c9fba03b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -525,6 +525,10 @@ void __init __attribute__((weak)) smp_setup_processor_id(void)
{
}
+void __init __weak thread_info_cache_init(void)
+{
+}
+
asmlinkage void __init start_kernel(void)
{
char * command_line;
@@ -645,6 +649,7 @@ asmlinkage void __init start_kernel(void)
if (efi_enabled)
efi_enter_virtual_mode();
#endif
+ thread_info_cache_init();
fork_init(num_physpages);
proc_caches_init();
buffer_init();
--
2.41.3