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Commit 2e82669a authored by Catalin Marinas's avatar Catalin Marinas Committed by Russell King
Browse files

ARM: 6867/1: Introduce THREAD_NOTIFY_COPY for copy_thread() hooks 



This patch adds THREAD_NOTIFY_COPY for calling registered handlers
during the copy_thread() function call. It also changes the VFP handler
to use a switch statement rather than if..else and ignore this event.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 97450826

arch/arm/include/asm/thread_notify.h

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ static inline void thread_notify(unsigned long rc, struct thread_info *thread) 
#define THREAD_NOTIFY_FLUSH	0

#define THREAD_NOTIFY_EXIT	1

#define THREAD_NOTIFY_SWITCH	2

#define THREAD_NOTIFY_COPY	3



#endif

#endif

arch/arm/kernel/process.c

+2 −0
Original line number Diff line number Diff line
@@ -372,6 +372,8 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start, 
	if (clone_flags & CLONE_SETTLS)

		thread->tp_value = regs->ARM_r3;



	thread_notify(THREAD_NOTIFY_COPY, thread);



	return 0;

}

arch/arm/vfp/vfpmodule.c

+15 −7
Original line number Diff line number Diff line
@@ -104,12 +104,17 @@ static void vfp_thread_exit(struct thread_info *thread) 
static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)

{

	struct thread_info *thread = v;

	u32 fpexc;

#ifdef CONFIG_SMP

	unsigned int cpu;

#endif



	if (likely(cmd == THREAD_NOTIFY_SWITCH)) {

		u32 fpexc = fmrx(FPEXC);

	switch (cmd) {

	case THREAD_NOTIFY_SWITCH:

		fpexc = fmrx(FPEXC);



#ifdef CONFIG_SMP

		unsigned int cpu = thread->cpu;

		cpu = thread->cpu;



		/*

		 * On SMP, if VFP is enabled, save the old state in
@@ -134,13 +139,16 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v) 
		 * old state.

		 */

		fmxr(FPEXC, fpexc & ~FPEXC_EN);

		return NOTIFY_DONE;

	}

		break;



	if (cmd == THREAD_NOTIFY_FLUSH)

	case THREAD_NOTIFY_FLUSH:

		vfp_thread_flush(thread);

	else

		break;



	case THREAD_NOTIFY_EXIT:

		vfp_thread_exit(thread);

		break;

	}



	return NOTIFY_DONE;

}