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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull irq cleanups from Ingo Molnar:
 "This is a multi-arch cleanup series from Thomas Gleixner, which we
  kept to near the end of the merge window, to not interfere with
  architecture updates.

  This series (motivated by the -rt kernel) unifies more aspects of IRQ
  handling and generalizes PREEMPT_ACTIVE"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  preempt: Make PREEMPT_ACTIVE generic
  sparc: Use preempt_schedule_irq
  ia64: Use preempt_schedule_irq
  m32r: Use preempt_schedule_irq
  hardirq: Make hardirq bits generic
  m68k: Simplify low level interrupt handling code
  genirq: Prevent spurious detection for unconditionally polled interrupts
This commit is contained in:
Linus Torvalds 2013-11-19 10:40:00 -08:00
parent 801a76050b 00d1a39e69
commit 4007162647
50 changed files with 55 additions and 275 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/include/asm/thread_info.h
View File

@ -58,8 +58,6 @@ register struct thread_info *__current_thread_info __asm__("$8");
#define THREAD_SIZE_ORDER 1
#define THREAD_SIZE (2*PAGE_SIZE)
#define PREEMPT_ACTIVE 0x40000000
/*
* Thread information flags:
* - these are process state flags and used from assembly

2
arch/arc/include/asm/thread_info.h
View File

@ -80,8 +80,6 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
#endif /* !__ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flags
* - these are process state flags that various assembly files may need to

6
arch/arm/include/asm/thread_info.h
View File

@ -140,12 +140,6 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
struct user_vfp_exc __user *);
#endif
/*
* We use bit 30 of the preempt_count to indicate that kernel
* preemption is occurring. See <asm/hardirq.h>.
*/
#define PREEMPT_ACTIVE 0x40000000
/*
* thread information flags:
* TIF_SYSCALL_TRACE - syscall trace active

6
arch/arm64/include/asm/thread_info.h
View File

@ -88,12 +88,6 @@ static inline struct thread_info *current_thread_info(void)
#endif
/*
* We use bit 30 of the preempt_count to indicate that kernel
* preemption is occurring. See <asm/hardirq.h>.
*/
#define PREEMPT_ACTIVE 0x40000000
/*
* thread information flags:
* TIF_SYSCALL_TRACE - syscall trace active

2
arch/avr32/include/asm/thread_info.h
View File

@ -66,8 +66,6 @@ static inline struct thread_info *current_thread_info(void)
#endif /* !__ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x40000000
/*
* Thread information flags
* - these are process state flags that various assembly files may need to access

3
arch/blackfin/include/asm/hardirq.h
View File

@ -12,9 +12,6 @@
extern void ack_bad_irq(unsigned int irq);
#define ack_bad_irq ack_bad_irq
/* Define until common code gets sane defaults */
#define HARDIRQ_BITS 9
#include <asm-generic/hardirq.h>
#endif

2
arch/blackfin/include/asm/thread_info.h
View File

@ -88,8 +88,6 @@ static inline struct thread_info *current_thread_info(void)
#define TI_CPU 12
#define TI_PREEMPT 16
#define PREEMPT_ACTIVE 0x4000000
/*
* thread information flag bit numbers
*/

2
arch/c6x/include/asm/thread_info.h
View File

@ -84,8 +84,6 @@ struct thread_info *current_thread_info(void)
#define put_thread_info(ti) put_task_struct((ti)->task)
#endif /* __ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flag bit numbers
* - pending work-to-be-done flags are in LSW

12
arch/cris/include/asm/hardirq.h
View File

@ -2,18 +2,6 @@
#define __ASM_HARDIRQ_H
#include <asm/irq.h>
#define HARDIRQ_BITS 8
/*
* The hardirq mask has to be large enough to have
* space for potentially all IRQ sources in the system
* nesting on a single CPU:
*/
#if (1 << HARDIRQ_BITS) < NR_IRQS
# error HARDIRQ_BITS is too low!
#endif
#include <asm-generic/hardirq.h>
#endif /* __ASM_HARDIRQ_H */

2
arch/cris/include/asm/thread_info.h
View File

@ -44,8 +44,6 @@ struct thread_info {
#endif
#define PREEMPT_ACTIVE 0x10000000
/*
* macros/functions for gaining access to the thread information structure
*/

2
arch/frv/include/asm/thread_info.h
View File

@ -52,8 +52,6 @@ struct thread_info {
#endif
#define PREEMPT_ACTIVE 0x10000000
/*
* macros/functions for gaining access to the thread information structure
*/

4
arch/hexagon/include/asm/thread_info.h
View File

@ -73,10 +73,6 @@ struct thread_info {
#endif /* __ASSEMBLY__ */
/* looks like "linux/hardirq.h" uses this. */
#define PREEMPT_ACTIVE 0x10000000
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk) \

3
arch/ia64/include/asm/thread_info.h
View File

@ -11,9 +11,6 @@
#include <asm/processor.h>
#include <asm/ptrace.h>
#define PREEMPT_ACTIVE_BIT 30
#define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
#ifndef __ASSEMBLY__
/*

15
arch/ia64/kernel/entry.S
View File

@ -1169,21 +1169,8 @@ skip_rbs_switch:
.work_pending:
tbit.z p6,p0=r31,TIF_NEED_RESCHED // is resched not needed?
(p6) br.cond.sptk.few .notify
#ifdef CONFIG_PREEMPT
(pKStk) dep r21=-1,r0,PREEMPT_ACTIVE_BIT,1
;;
(pKStk) st4 [r20]=r21
#endif
SSM_PSR_I(p0, p6, r2) // enable interrupts
br.call.spnt.many rp=schedule
br.call.spnt.many rp=preempt_schedule_irq
.ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1 (re-check)
RSM_PSR_I(p0, r2, r20) // disable interrupts
;;
#ifdef CONFIG_PREEMPT
(pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
;;
(pKStk) st4 [r20]=r0 // preempt_count() <- 0
#endif
(pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
br.cond.sptk.many .work_processed_kernel

16
arch/m32r/include/asm/hardirq.h
View File

@ -3,22 +3,6 @@
#define __ASM_HARDIRQ_H
#include <asm/irq.h>
#if NR_IRQS > 256
#define HARDIRQ_BITS 9
#else
#define HARDIRQ_BITS 8
#endif
/*
* The hardirq mask has to be large enough to have
* space for potentially all IRQ sources in the system
* nesting on a single CPU:
*/
#if (1 << HARDIRQ_BITS) < NR_IRQS
# error HARDIRQ_BITS is too low!
#endif
#include <asm-generic/hardirq.h>
#endif /* __ASM_HARDIRQ_H */

2
arch/m32r/include/asm/thread_info.h
View File

@ -53,8 +53,6 @@ struct thread_info {
#endif
#define PREEMPT_ACTIVE 0x10000000
#define THREAD_SIZE (PAGE_SIZE << 1)
#define THREAD_SIZE_ORDER 1
/*

8
arch/m32r/kernel/entry.S
View File

@ -182,13 +182,7 @@ need_resched:
ld r4, PSW(sp) ; interrupts off (exception path) ?
and3 r4, r4, #0x4000
beqz r4, restore_all
LDIMM (r4, PREEMPT_ACTIVE)
st r4, @(TI_PRE_COUNT, r8)
ENABLE_INTERRUPTS(r4)
bl schedule
ldi r4, #0
st r4, @(TI_PRE_COUNT, r8)
DISABLE_INTERRUPTS(r4)
bl preempt_schedule_irq
bra need_resched
#endif

11
arch/m68k/include/asm/hardirq.h
View File

@ -5,17 +5,6 @@
#include <linux/cache.h>
#include <asm/irq.h>
#define HARDIRQ_BITS 8
/*
* The hardirq mask has to be large enough to have
* space for potentially all IRQ sources in the system
* nesting on a single CPU:
*/
#if (1 << HARDIRQ_BITS) < NR_IRQS
# error HARDIRQ_BITS is too low!
#endif
#ifdef CONFIG_MMU
static inline void ack_bad_irq(unsigned int irq)

2
arch/m68k/include/asm/thread_info.h
View File

@ -35,8 +35,6 @@ struct thread_info {
};
#endif /* __ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x4000000
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \

40
arch/m68k/kernel/entry.S
View File

@ -45,7 +45,7 @@
.globl system_call, buserr, trap, resume
.globl sys_call_table
.globl __sys_fork, __sys_clone, __sys_vfork
.globl ret_from_interrupt, bad_interrupt
.globl bad_interrupt
.globl auto_irqhandler_fixup
.globl user_irqvec_fixup
@ -275,8 +275,6 @@ do_delayed_trace:
ENTRY(auto_inthandler)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %d0,%a1
addqb #1,%a1@(TINFO_PREEMPT+1)
| put exception # in d0
bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
subw #VEC_SPUR,%d0
@ -286,32 +284,13 @@ ENTRY(auto_inthandler)
auto_irqhandler_fixup = . + 2
jsr do_IRQ | process the IRQ
addql #8,%sp | pop parameters off stack
ret_from_interrupt:
movel %curptr@(TASK_STACK),%a1
subqb #1,%a1@(TINFO_PREEMPT+1)
jeq ret_from_last_interrupt
2: RESTORE_ALL
ALIGN
ret_from_last_interrupt:
moveq #(~ALLOWINT>>8)&0xff,%d0
andb %sp@(PT_OFF_SR),%d0
jne 2b
/* check if we need to do software interrupts */
tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
jeq .Lret_from_exception
pea ret_from_exception
jra do_softirq
jra ret_from_exception
/* Handler for user defined interrupt vectors */
ENTRY(user_inthandler)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %d0,%a1
addqb #1,%a1@(TINFO_PREEMPT+1)
| put exception # in d0
bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
user_irqvec_fixup = . + 2
@ -321,29 +300,18 @@ user_irqvec_fixup = . + 2
movel %d0,%sp@- | put vector # on stack
jsr do_IRQ | process the IRQ
addql #8,%sp | pop parameters off stack
movel %curptr@(TASK_STACK),%a1
subqb #1,%a1@(TINFO_PREEMPT+1)
jeq ret_from_last_interrupt
RESTORE_ALL
jra ret_from_exception
/* Handler for uninitialized and spurious interrupts */
ENTRY(bad_inthandler)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %d0,%a1
addqb #1,%a1@(TINFO_PREEMPT+1)
movel %sp,%sp@-
jsr handle_badint
addql #4,%sp
movel %curptr@(TASK_STACK),%a1
subqb #1,%a1@(TINFO_PREEMPT+1)
jeq ret_from_last_interrupt
RESTORE_ALL
jra ret_from_exception
resume:
/*

6
arch/m68k/kernel/ints.c
View File

@ -58,12 +58,6 @@ void __init init_IRQ(void)
{
int i;
/* assembly irq entry code relies on this... */
if (HARDIRQ_MASK != 0x00ff0000) {
extern void hardirq_mask_is_broken(void);
hardirq_mask_is_broken();
}
for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);

33
arch/m68k/platform/68000/entry.S
View File

@ -27,7 +27,6 @@
.globl ret_from_exception
.globl ret_from_signal
.globl sys_call_table
.globl ret_from_interrupt
.globl bad_interrupt
.globl inthandler1
.globl inthandler2
@ -137,7 +136,7 @@ inthandler1:
movel #65,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler2:
SAVE_ALL_INT
@ -148,7 +147,7 @@ inthandler2:
movel #66,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler3:
SAVE_ALL_INT
@ -159,7 +158,7 @@ inthandler3:
movel #67,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler4:
SAVE_ALL_INT
@ -170,7 +169,7 @@ inthandler4:
movel #68,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler5:
SAVE_ALL_INT
@ -181,7 +180,7 @@ inthandler5:
movel #69,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler6:
SAVE_ALL_INT
@ -192,7 +191,7 @@ inthandler6:
movel #70,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler7:
SAVE_ALL_INT
@ -203,7 +202,7 @@ inthandler7:
movel #71,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
bra ret_from_exception
inthandler:
SAVE_ALL_INT
@ -214,23 +213,7 @@ inthandler:
movel %d0,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
ret_from_interrupt:
jeq 1f
2:
RESTORE_ALL
1:
moveb %sp@(PT_OFF_SR), %d0
and #7, %d0
jhi 2b
/* check if we need to do software interrupts */
jeq ret_from_exception
pea ret_from_exception
jra do_softirq
bra ret_from_exception
/*
* Handler for uninitialized and spurious interrupts.

24
arch/m68k/platform/68360/entry.S
View File

@ -29,7 +29,6 @@
.globl ret_from_exception
.globl ret_from_signal
.globl sys_call_table
.globl ret_from_interrupt
.globl bad_interrupt
.globl inthandler
@ -132,26 +131,9 @@ inthandler:
movel %sp,%sp@-
movel %d0,%sp@- /* put vector # on stack*/
jbsr do_IRQ /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
ret_from_interrupt:
jeq 1f
2:
RESTORE_ALL
1:
moveb %sp@(PT_OFF_SR), %d0
and #7, %d0
jhi 2b
/* check if we need to do software interrupts */
movel irq_stat+CPUSTAT_SOFTIRQ_PENDING,%d0
jeq ret_from_exception
pea ret_from_exception
jra do_softirq
jbsr do_IRQ /* process the IRQ */
addql #8,%sp /* pop parameters off stack*/
jra ret_from_exception
/*
* Handler for uninitialized and spurious interrupts.

2
arch/metag/include/asm/thread_info.h
View File

@ -46,8 +46,6 @@ struct thread_info {
#endif
#define PREEMPT_ACTIVE 0x10000000
#ifdef CONFIG_4KSTACKS
#define THREAD_SHIFT 12
#else

2
arch/microblaze/include/asm/thread_info.h
View File

@ -106,8 +106,6 @@ static inline struct thread_info *current_thread_info(void)
/* thread information allocation */
#endif /* __ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flags
* - these are process state flags that various assembly files may

2
arch/mips/include/asm/thread_info.h
View File

@ -92,8 +92,6 @@ static inline struct thread_info *current_thread_info(void)
#define STACK_WARN (THREAD_SIZE / 8)
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flags
* - these are process state flags that various assembly files may need to

2
arch/mn10300/include/asm/thread_info.h
View File

@ -16,8 +16,6 @@
#include <asm/page.h>
#define PREEMPT_ACTIVE 0x10000000
#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE (4096)
#define THREAD_SIZE_ORDER (0)

3
arch/parisc/include/asm/thread_info.h
View File

@ -46,9 +46,6 @@ struct thread_info {
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_SHIFT (PAGE_SHIFT + THREAD_SIZE_ORDER)
#define PREEMPT_ACTIVE_BIT 28
#define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
/*
* thread information flags
*/

2
arch/powerpc/include/asm/thread_info.h
View File

@ -82,8 +82,6 @@ static inline struct thread_info *current_thread_info(void)
#endif /* __ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flag bit numbers
*/

2
arch/s390/include/asm/hardirq.h
View File

@ -18,8 +18,6 @@
#define __ARCH_HAS_DO_SOFTIRQ
#define __ARCH_IRQ_EXIT_IRQS_DISABLED
#define HARDIRQ_BITS 8
static inline void ack_bad_irq(unsigned int irq)
{
printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq);

2
arch/s390/include/asm/thread_info.h
View File

@ -111,6 +111,4 @@ static inline struct thread_info *current_thread_info(void)
#define is_32bit_task() (1)
#endif
#define PREEMPT_ACTIVE 0x4000000
#endif /* _ASM_THREAD_INFO_H */

2
arch/score/include/asm/thread_info.h
View File

@ -72,8 +72,6 @@ register struct thread_info *__current_thread_info __asm__("r28");
#endif /* !__ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flags
* - these are process state flags that various assembly files may need to

2
arch/sh/include/asm/thread_info.h
View File

@ -41,8 +41,6 @@ struct thread_info {
#endif
#define PREEMPT_ACTIVE 0x10000000
#if defined(CONFIG_4KSTACKS)
#define THREAD_SHIFT 12
#else

6
arch/sh/kernel/entry-common.S
View File

@ -108,7 +108,7 @@ need_resched:
and #(0xf0>>1), r0 ! interrupts off (exception path)?
cmp/eq #(0xf0>>1), r0
bt noresched
mov.l 3f, r0
mov.l 1f, r0
jsr @r0 ! call preempt_schedule_irq
nop
bra need_resched
@ -119,9 +119,7 @@ noresched:
nop
.align 2
1: .long PREEMPT_ACTIVE
2: .long schedule
3: .long preempt_schedule_irq
1: .long preempt_schedule_irq
#endif
ENTRY(resume_userspace)

1
arch/sparc/include/asm/hardirq_32.h
View File

@ -7,7 +7,6 @@
#ifndef __SPARC_HARDIRQ_H
#define __SPARC_HARDIRQ_H
#define HARDIRQ_BITS 8
#include <asm-generic/hardirq.h>
#endif /* __SPARC_HARDIRQ_H */

2
arch/sparc/include/asm/hardirq_64.h
View File

@ -14,6 +14,4 @@
void ack_bad_irq(unsigned int irq);
#define HARDIRQ_BITS 8
#endif /* !(__SPARC64_HARDIRQ_H) */

2
arch/sparc/include/asm/thread_info_32.h
View File

@ -105,8 +105,6 @@ register struct thread_info *current_thread_info_reg asm("g6");
#define TI_W_SAVED 0x250
/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
#define PREEMPT_ACTIVE 0x4000000
/*
* thread information flag bit numbers
*/

2
arch/sparc/include/asm/thread_info_64.h
View File

@ -111,8 +111,6 @@ struct thread_info {
#define THREAD_SHIFT PAGE_SHIFT
#endif /* PAGE_SHIFT == 13 */
#define PREEMPT_ACTIVE 0x10000000
/*
* macros/functions for gaining access to the thread information structure
*/

6
arch/sparc/kernel/rtrap_64.S
View File

@ -312,12 +312,10 @@ to_kernel:
nop
cmp %l4, 0
bne,pn %xcc, kern_fpucheck
sethi %hi(PREEMPT_ACTIVE), %l6
stw %l6, [%g6 + TI_PRE_COUNT]
call schedule
nop
call preempt_schedule_irq
nop
ba,pt %xcc, rtrap
stw %g0, [%g6 + TI_PRE_COUNT]
#endif
kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5
brz,pt %l5, rt_continue

2
arch/tile/include/asm/hardirq.h
View File

@ -42,6 +42,4 @@ DECLARE_PER_CPU(irq_cpustat_t, irq_stat);
#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
#define HARDIRQ_BITS 8
#endif /* _ASM_TILE_HARDIRQ_H */

2
arch/tile/include/asm/thread_info.h
View File

@ -113,8 +113,6 @@ extern void _cpu_idle(void);
#endif /* !__ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* Thread information flags that various assembly files may need to access.
* Keep flags accessed frequently in low bits, particular since it makes

2
arch/um/include/asm/thread_info.h
View File

@ -60,8 +60,6 @@ static inline struct thread_info *current_thread_info(void)
#endif
#define PREEMPT_ACTIVE 0x10000000
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */

6
arch/unicore32/include/asm/thread_info.h
View File

@ -117,12 +117,6 @@ static inline struct thread_info *current_thread_info(void)
#endif
/*
* We use bit 30 of the preempt_count to indicate that kernel
* preemption is occurring. See <asm/hardirq.h>.
*/
#define PREEMPT_ACTIVE 0x40000000
/*
* thread information flags:
* TIF_SYSCALL_TRACE - syscall trace active

2
arch/x86/include/asm/thread_info.h
View File

@ -153,8 +153,6 @@ struct thread_info {
#define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
#define PREEMPT_ACTIVE 0x10000000
#ifdef CONFIG_X86_32
#define STACK_WARN (THREAD_SIZE/8)

2
arch/xtensa/include/asm/thread_info.h
View File

@ -76,8 +76,6 @@ struct thread_info {
#endif
#define PREEMPT_ACTIVE 0x10000000
/*
* macros/functions for gaining access to the thread information structure
*/

7
include/linux/irq.h
View File

@ -70,6 +70,9 @@ typedef void (*irq_preflow_handler_t)(struct irq_data *data);
* IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context
* IRQ_NESTED_TRHEAD - Interrupt nests into another thread
* IRQ_PER_CPU_DEVID - Dev_id is a per-cpu variable
* IRQ_IS_POLLED - Always polled by another interrupt. Exclude
* it from the spurious interrupt detection
* mechanism and from core side polling.
*/
enum {
IRQ_TYPE_NONE = 0x00000000,
@ -94,12 +97,14 @@ enum {
IRQ_NESTED_THREAD = (1 << 15),
IRQ_NOTHREAD = (1 << 16),
IRQ_PER_CPU_DEVID = (1 << 17),
IRQ_IS_POLLED = (1 << 18),
};
#define IRQF_MODIFY_MASK \
(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID)
IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
IRQ_IS_POLLED)
#define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)

41
include/linux/preempt_mask.h
View File

@ -11,36 +11,23 @@
* - bits 0-7 are the preemption count (max preemption depth: 256)
* - bits 8-15 are the softirq count (max # of softirqs: 256)
*
* The hardirq count can in theory reach the same as NR_IRQS.
* In reality, the number of nested IRQS is limited to the stack
* size as well. For archs with over 1000 IRQS it is not practical
* to expect that they will all nest. We give a max of 10 bits for
* hardirq nesting. An arch may choose to give less than 10 bits.
* m68k expects it to be 8.
* The hardirq count could in theory be the same as the number of
* interrupts in the system, but we run all interrupt handlers with
* interrupts disabled, so we cannot have nesting interrupts. Though
* there are a few palaeontologic drivers which reenable interrupts in
* the handler, so we need more than one bit here.
*
* - bits 16-25 are the hardirq count (max # of nested hardirqs: 1024)
* - bit 26 is the NMI_MASK
* - bit 27 is the PREEMPT_ACTIVE flag
*
* PREEMPT_MASK: 0x000000ff
* SOFTIRQ_MASK: 0x0000ff00
* HARDIRQ_MASK: 0x03ff0000
* NMI_MASK: 0x04000000
* PREEMPT_MASK: 0x000000ff
* SOFTIRQ_MASK: 0x0000ff00
* HARDIRQ_MASK: 0x000f0000
* NMI_MASK: 0x00100000
* PREEMPT_ACTIVE: 0x00200000
*/
#define PREEMPT_BITS 8
#define SOFTIRQ_BITS 8
#define HARDIRQ_BITS 4
#define NMI_BITS 1
#define MAX_HARDIRQ_BITS 10
#ifndef HARDIRQ_BITS
# define HARDIRQ_BITS MAX_HARDIRQ_BITS
#endif
#if HARDIRQ_BITS > MAX_HARDIRQ_BITS
#error HARDIRQ_BITS too high!
#endif
#define PREEMPT_SHIFT 0
#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
@ -60,15 +47,9 @@
#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
#ifndef PREEMPT_ACTIVE
#define PREEMPT_ACTIVE_BITS 1
#define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS)
#define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT)
#endif
#if PREEMPT_ACTIVE < (1 << (NMI_SHIFT + NMI_BITS))
#error PREEMPT_ACTIVE is too low!
#endif
#define hardirq_count() (preempt_count() & HARDIRQ_MASK)
#define softirq_count() (preempt_count() & SOFTIRQ_MASK)

2
include/linux/sched.h
View File

@ -22,7 +22,7 @@ struct sched_param {
#include <linux/errno.h>
#include <linux/nodemask.h>
#include <linux/mm_types.h>
#include <linux/preempt.h>
#include <linux/preempt_mask.h>
#include <asm/page.h>
#include <asm/ptrace.h>

7
kernel/irq/settings.h
View File

@ -14,6 +14,7 @@ enum {
_IRQ_NO_BALANCING = IRQ_NO_BALANCING,
_IRQ_NESTED_THREAD = IRQ_NESTED_THREAD,
_IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID,
_IRQ_IS_POLLED = IRQ_IS_POLLED,
_IRQF_MODIFY_MASK = IRQF_MODIFY_MASK,
};
@ -26,6 +27,7 @@ enum {
#define IRQ_NOAUTOEN GOT_YOU_MORON
#define IRQ_NESTED_THREAD GOT_YOU_MORON
#define IRQ_PER_CPU_DEVID GOT_YOU_MORON
#define IRQ_IS_POLLED GOT_YOU_MORON
#undef IRQF_MODIFY_MASK
#define IRQF_MODIFY_MASK GOT_YOU_MORON
@ -147,3 +149,8 @@ static inline bool irq_settings_is_nested_thread(struct irq_desc *desc)
{
return desc->status_use_accessors & _IRQ_NESTED_THREAD;
}
static inline bool irq_settings_is_polled(struct irq_desc *desc)
{
return desc->status_use_accessors & _IRQ_IS_POLLED;
}

12
kernel/irq/spurious.c
View File

@ -67,8 +67,13 @@ static int try_one_irq(int irq, struct irq_desc *desc, bool force)
raw_spin_lock(&desc->lock);
/* PER_CPU and nested thread interrupts are never polled */
if (irq_settings_is_per_cpu(desc) || irq_settings_is_nested_thread(desc))
/*
* PER_CPU, nested thread interrupts and interrupts explicitely
* marked polled are excluded from polling.
*/
if (irq_settings_is_per_cpu(desc) ||
irq_settings_is_nested_thread(desc) ||
irq_settings_is_polled(desc))
goto out;
/*
@ -268,7 +273,8 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
void note_interrupt(unsigned int irq, struct irq_desc *desc,
irqreturn_t action_ret)
{
if (desc->istate & IRQS_POLL_INPROGRESS)
if (desc->istate & IRQS_POLL_INPROGRESS ||
irq_settings_is_polled(desc))
return;
/* we get here again via the threaded handler */