Some architecture need to maintain a kmem cache for thread info
structures. (next patch 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@xxxxxxxxxxxxxxxxxxx>
---
include/linux/sched.h | 2 ++
init/main.c | 5 +++++
2 files changed, 7 insertions(+)
--- linux-work.orig/init/main.c 2008-03-26 10:39:25.000000000 +1100
+++ linux-work/init/main.c 2008-04-18 16:43:53.000000000 +1000
@@ -504,6 +504,10 @@ void __init __attribute__((weak)) smp_se
{
}
+void __init __weak thread_info_cache_init(void)
+{
+}
+
asmlinkage void __init start_kernel(void)
{
char * command_line;
@@ -623,6 +627,7 @@ 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();
Index: linux-work/include/linux/sched.h
===================================================================
--- linux-work.orig/include/linux/sched.h 2008-04-02 09:47:56.000000000 +1100
+++ linux-work/include/linux/sched.h 2008-04-18 13:11:10.000000000 +1000
@@ -1893,6 +1893,8 @@ static inline unsigned long *end_of_stac
#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
*/
--
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