Commit 3e9ca022 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 

Pull powerpc fixes from Paul Mackerras:
 "Two small fixes for powerpc:
   - a fix for a regression since 3.2 that causes 4-second (or longer)
     pauses
   - a fix for a potential oops when loading kernel modules on 32-bit
     embedded systems."

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  powerpc: Fix kernel panic during kernel module load
  powerpc/time: Sanity check of decrementer expiration is necessary
parents e7264308 3c752965

arch/powerpc/kernel/module_32.c

+5 −6
Original line number Diff line number Diff line
@@ -176,8 +176,8 @@ int module_frob_arch_sections(Elf32_Ehdr *hdr, 


static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val)

{

	if (entry->jump[0] == 0x3d600000 + ((val + 0x8000) >> 16)

	    && entry->jump[1] == 0x396b0000 + (val & 0xffff))

	if (entry->jump[0] == 0x3d800000 + ((val + 0x8000) >> 16)

	    && entry->jump[1] == 0x398c0000 + (val & 0xffff))

		return 1;

	return 0;

}
@@ -204,10 +204,9 @@ static uint32_t do_plt_call(void *location, 
		entry++;

	}



	/* Stolen from Paul Mackerras as well... */

	entry->jump[0] = 0x3d600000+((val+0x8000)>>16);	/* lis r11,sym@ha */

	entry->jump[1] = 0x396b0000 + (val&0xffff);	/* addi r11,r11,sym@l*/

	entry->jump[2] = 0x7d6903a6;			/* mtctr r11 */

	entry->jump[0] = 0x3d800000+((val+0x8000)>>16); /* lis r12,sym@ha */

	entry->jump[1] = 0x398c0000 + (val&0xffff);     /* addi r12,r12,sym@l*/

	entry->jump[2] = 0x7d8903a6;                    /* mtctr r12 */

	entry->jump[3] = 0x4e800420;			/* bctr */



	DEBUGP("Initialized plt for 0x%x at %p\n", val, entry);

arch/powerpc/kernel/time.c

+11 −3
Original line number Diff line number Diff line
@@ -475,6 +475,7 @@ void timer_interrupt(struct pt_regs * regs) 
	struct pt_regs *old_regs;

	u64 *next_tb = &__get_cpu_var(decrementers_next_tb);

	struct clock_event_device *evt = &__get_cpu_var(decrementers);

	u64 now;



	/* Ensure a positive value is written to the decrementer, or else

	 * some CPUs will continue to take decrementer exceptions.
@@ -509,9 +510,16 @@ void timer_interrupt(struct pt_regs * regs) 
		irq_work_run();

	}



	now = get_tb_or_rtc();

	if (now >= *next_tb) {

		*next_tb = ~(u64)0;

		if (evt->event_handler)

			evt->event_handler(evt);

	} else {

		now = *next_tb - now;

		if (now <= DECREMENTER_MAX)

			set_dec((int)now);

	}



#ifdef CONFIG_PPC64

	/* collect purr register values often, for accurate calculations */

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