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Commit 59970753 authored by Max Filippov's avatar Max Filippov Committed by Chris Zankel
Browse files

xtensa: call check_s32c1i after trap_init 



Otherwise exceptions may occur prior to exception handling mechanism
initialization, resulting in silently dead system.

Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent 62351531

arch/xtensa/kernel/setup.c

+7 −11
Original line number Diff line number Diff line
@@ -354,7 +354,8 @@ static inline int probed_compare_swap(int *v, int cmp, int set) 


/* Handle probed exception */



void __init do_probed_exception(struct pt_regs *regs, unsigned long exccause)

static void __init do_probed_exception(struct pt_regs *regs,

		unsigned long exccause)

{

	if (regs->pc == rcw_probe_pc) {	/* exception on s32c1i ? */

		regs->pc += 3;		/* skip the s32c1i instruction */
@@ -366,7 +367,7 @@ void __init do_probed_exception(struct pt_regs *regs, unsigned long exccause) 


/* Simple test of S32C1I (soc bringup assist) */



void __init check_s32c1i(void)

static int __init check_s32c1i(void)

{

	int n, cause1, cause2;

	void *handbus, *handdata, *handaddr; /* temporarily saved handlers */
@@ -421,24 +422,21 @@ void __init check_s32c1i(void) 
	trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR, handbus);

	trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR, handdata);

	trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR, handaddr);

	return 0;

}



#else /* XCHAL_HAVE_S32C1I */



/* This condition should not occur with a commercially deployed processor.

   Display reminder for early engr test or demo chips / FPGA bitstreams */

void __init check_s32c1i(void)

static int __init check_s32c1i(void)

{

	pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");

	return 0;

}



#endif /* XCHAL_HAVE_S32C1I */

#else /* CONFIG_S32C1I_SELFTEST */



void __init check_s32c1i(void)

{

}



early_initcall(check_s32c1i);

#endif /* CONFIG_S32C1I_SELFTEST */
@@ -447,8 +445,6 @@ void __init setup_arch(char **cmdline_p) 
	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);

	*cmdline_p = command_line;



	check_s32c1i();



	/* Reserve some memory regions */



#ifdef CONFIG_BLK_DEV_INITRD