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

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Pull powerpc fixes from Benjamin Herrenschmidt:
 "Here are a few powerpc fixes.  Arguably some of this should have come
  to you earlier but I'm only just catching up after my medical leave.

  Mostly these fixes regressions, a couple are long standing bugs."

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/pseries: Fix software invalidate TCE
  powerpc: check_and_cede_processor() never cedes
  powerpc/ftrace: Do not trace restore_interrupts()
  powerpc: Fix Section mismatch warnings in prom_init.c
  ppc64: fix missing to check all bits of _TIF_USER_WORK_MASK in preempt
  powerpc: Fix uninitialised error in numa.c
  powerpc: Fix BPF_JIT code to link with multiple TOCs
This commit is contained in:
Linus Torvalds 2012-06-29 13:50:11 -07:00
commit 15114c7e1c
8 changed files with 54 additions and 64 deletions
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5
arch/powerpc/include/asm/hw_irq.h
View File

@ -103,6 +103,11 @@ static inline void hard_irq_disable(void)
/* include/linux/interrupt.h needs hard_irq_disable to be a macro */
#define hard_irq_disable hard_irq_disable
static inline bool lazy_irq_pending(void)
{
return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
}
/*
* This is called by asynchronous interrupts to conditionally
* re-enable hard interrupts when soft-disabled after having

97
arch/powerpc/kernel/entry_64.S
View File

@ -558,27 +558,54 @@ _GLOBAL(ret_from_except_lite)
mtmsrd r10,1 /* Update machine state */
#endif /* CONFIG_PPC_BOOK3E */
#ifdef CONFIG_PREEMPT
clrrdi r9,r1,THREAD_SHIFT /* current_thread_info() */
li r0,_TIF_NEED_RESCHED /* bits to check */
ld r3,_MSR(r1)
ld r4,TI_FLAGS(r9)
/* Move MSR_PR bit in r3 to _TIF_SIGPENDING position in r0 */
rlwimi r0,r3,32+TIF_SIGPENDING-MSR_PR_LG,_TIF_SIGPENDING
and. r0,r4,r0 /* check NEED_RESCHED and maybe SIGPENDING */
bne do_work
#else /* !CONFIG_PREEMPT */
ld r3,_MSR(r1) /* Returning to user mode? */
andi. r3,r3,MSR_PR
beq restore /* if not, just restore regs and return */
beq resume_kernel
/* Check current_thread_info()->flags */
andi. r0,r4,_TIF_USER_WORK_MASK
beq restore
andi. r0,r4,_TIF_NEED_RESCHED
beq 1f
bl .restore_interrupts
bl .schedule
b .ret_from_except_lite
1: bl .save_nvgprs
bl .restore_interrupts
addi r3,r1,STACK_FRAME_OVERHEAD
bl .do_notify_resume
b .ret_from_except
resume_kernel:
#ifdef CONFIG_PREEMPT
/* Check if we need to preempt */
andi. r0,r4,_TIF_NEED_RESCHED
beq+ restore
/* Check that preempt_count() == 0 and interrupts are enabled */
lwz r8,TI_PREEMPT(r9)
cmpwi cr1,r8,0
ld r0,SOFTE(r1)
cmpdi r0,0
crandc eq,cr1*4+eq,eq
bne restore
/*
* Here we are preempting the current task. We want to make
* sure we are soft-disabled first
*/
SOFT_DISABLE_INTS(r3,r4)
1: bl .preempt_schedule_irq
/* Re-test flags and eventually loop */
clrrdi r9,r1,THREAD_SHIFT
ld r4,TI_FLAGS(r9)
andi. r0,r4,_TIF_USER_WORK_MASK
bne do_work
#endif /* !CONFIG_PREEMPT */
andi. r0,r4,_TIF_NEED_RESCHED
bne 1b
#endif /* CONFIG_PREEMPT */
.globl fast_exc_return_irq
fast_exc_return_irq:
@ -759,50 +786,6 @@ restore_check_irq_replay:
#endif /* CONFIG_PPC_BOOK3E */
1: b .ret_from_except /* What else to do here ? */
3:
do_work:
#ifdef CONFIG_PREEMPT
andi. r0,r3,MSR_PR /* Returning to user mode? */
bne user_work
/* Check that preempt_count() == 0 and interrupts are enabled */
lwz r8,TI_PREEMPT(r9)
cmpwi cr1,r8,0
ld r0,SOFTE(r1)
cmpdi r0,0
crandc eq,cr1*4+eq,eq
bne restore
/*
* Here we are preempting the current task. We want to make
* sure we are soft-disabled first
*/
SOFT_DISABLE_INTS(r3,r4)
1: bl .preempt_schedule_irq
/* Re-test flags and eventually loop */
clrrdi r9,r1,THREAD_SHIFT
ld r4,TI_FLAGS(r9)
andi. r0,r4,_TIF_NEED_RESCHED
bne 1b
b restore
user_work:
#endif /* CONFIG_PREEMPT */
andi. r0,r4,_TIF_NEED_RESCHED
beq 1f
bl .restore_interrupts
bl .schedule
b .ret_from_except_lite
1: bl .save_nvgprs
bl .restore_interrupts
addi r3,r1,STACK_FRAME_OVERHEAD
bl .do_notify_resume
b .ret_from_except
unrecov_restore:
addi r3,r1,STACK_FRAME_OVERHEAD
bl .unrecoverable_exception

2
arch/powerpc/kernel/irq.c
View File

@ -277,7 +277,7 @@ EXPORT_SYMBOL(arch_local_irq_restore);
* NOTE: This is called with interrupts hard disabled but not marked
* as such in paca->irq_happened, so we need to resync this.
*/
void restore_interrupts(void)
void notrace restore_interrupts(void)
{
if (irqs_disabled()) {
local_paca->irq_happened |= PACA_IRQ_HARD_DIS;

4
arch/powerpc/kernel/prom_init.c
View File

@ -1312,7 +1312,7 @@ static struct opal_secondary_data {
extern char opal_secondary_entry;
static void prom_query_opal(void)
static void __init prom_query_opal(void)
{
long rc;
@ -1436,7 +1436,7 @@ static void __init prom_opal_hold_cpus(void)
prom_debug("prom_opal_hold_cpus: end...\n");
}
static void prom_opal_takeover(void)
static void __init prom_opal_takeover(void)
{
struct opal_secondary_data *data = &RELOC(opal_secondary_data);
struct opal_takeover_args *args = &data->args;

2
arch/powerpc/mm/numa.c
View File

@ -635,7 +635,7 @@ static inline int __init read_usm_ranges(const u32 **usm)
*/
static void __init parse_drconf_memory(struct device_node *memory)
{
const u32 *dm, *usm;
const u32 *uninitialized_var(dm), *usm;
unsigned int n, rc, ranges, is_kexec_kdump = 0;
unsigned long lmb_size, base, size, sz;
int nid;

2
arch/powerpc/net/bpf_jit_64.S
View File

@ -105,6 +105,7 @@ sk_load_byte_msh_positive_offset:
mr r4, r_addr; \
li r6, SIZE; \
bl skb_copy_bits; \
nop; \
/* R3 = 0 on success */ \
addi r1, r1, BPF_PPC_SLOWPATH_FRAME; \
ld r0, 16(r1); \
@ -156,6 +157,7 @@ bpf_slow_path_byte_msh:
mr r4, r_addr; \
li r5, SIZE; \
bl bpf_internal_load_pointer_neg_helper; \
nop; \
/* R3 != 0 on success */ \
addi r1, r1, BPF_PPC_SLOWPATH_FRAME; \
ld r0, 16(r1); \

4
arch/powerpc/platforms/pseries/iommu.c
View File

@ -106,7 +106,7 @@ static int tce_build_pSeries(struct iommu_table *tbl, long index,
tcep++;
}
if (tbl->it_type == TCE_PCI_SWINV_CREATE)
if (tbl->it_type & TCE_PCI_SWINV_CREATE)
tce_invalidate_pSeries_sw(tbl, tces, tcep - 1);
return 0;
}
@ -121,7 +121,7 @@ static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
while (npages--)
*(tcep++) = 0;
if (tbl->it_type == TCE_PCI_SWINV_FREE)
if (tbl->it_type & TCE_PCI_SWINV_FREE)
tce_invalidate_pSeries_sw(tbl, tces, tcep - 1);
}

2
arch/powerpc/platforms/pseries/processor_idle.c
View File

@ -106,7 +106,7 @@ static void check_and_cede_processor(void)
* we first hard disable then check.
*/
hard_irq_disable();
if (get_paca()->irq_happened == 0)
if (!lazy_irq_pending())
cede_processor();
}