[POWERPC] Add thread_info_cache_init() weak hook (8c9843e5) · Commits · 戴 / test

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 −0

Original line number	Diff line number	Diff line
		@@ -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
		*/

init/main.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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();

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