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ia64/tlb: Eradicate tlb_migrate_finish() callback

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Only ia64-sn2 uses this as an optimization, and there it is of
questionable correctness due to the mm_users==1 test.

Remove it entirely.

No change in behavior intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2019-02-19 14:38:37 +01:00 committed by Ingo Molnar
parent 0a8caf211b
commit 6455959819
8 changed files with 0 additions and 40 deletions
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10
Documentation/core-api/cachetlb.rst
View File

@ -101,16 +101,6 @@ changes occur:
translations for software managed TLB configurations.
The sparc64 port currently does this.
6) ``void tlb_migrate_finish(struct mm_struct *mm)``
This interface is called at the end of an explicit
process migration. This interface provides a hook
to allow a platform to update TLB or context-specific
information for the address space.
The ia64 sn2 platform is one example of a platform
that uses this interface.
Next, we have the cache flushing interfaces. In general, when Linux
is changing an existing virtual-->physical mapping to a new value,
the sequence will be in one of the following forms::

13
arch/ia64/include/asm/machvec.h
View File

@ -30,7 +30,6 @@ typedef void ia64_mv_irq_init_t (void);
typedef void ia64_mv_send_ipi_t (int, int, int, int);
typedef void ia64_mv_timer_interrupt_t (int, void *);
typedef void ia64_mv_global_tlb_purge_t (struct mm_struct *, unsigned long, unsigned long, unsigned long);
typedef void ia64_mv_tlb_migrate_finish_t (struct mm_struct *);
typedef u8 ia64_mv_irq_to_vector (int);
typedef unsigned int ia64_mv_local_vector_to_irq (u8);
typedef char *ia64_mv_pci_get_legacy_mem_t (struct pci_bus *);
@ -79,11 +78,6 @@ machvec_noop (void)
{
}
static inline void
machvec_noop_mm (struct mm_struct *mm)
{
}
static inline void
machvec_noop_task (struct task_struct *task)
{
@ -96,7 +90,6 @@ machvec_noop_bus (struct pci_bus *bus)
extern void machvec_setup (char **);
extern void machvec_timer_interrupt (int, void *);
extern void machvec_tlb_migrate_finish (struct mm_struct *);
# if defined (CONFIG_IA64_HP_SIM)
# include <asm/machvec_hpsim.h>
@ -124,7 +117,6 @@ extern void machvec_tlb_migrate_finish (struct mm_struct *);
# define platform_send_ipi ia64_mv.send_ipi
# define platform_timer_interrupt ia64_mv.timer_interrupt
# define platform_global_tlb_purge ia64_mv.global_tlb_purge
# define platform_tlb_migrate_finish ia64_mv.tlb_migrate_finish
# define platform_dma_init ia64_mv.dma_init
# define platform_dma_get_ops ia64_mv.dma_get_ops
# define platform_irq_to_vector ia64_mv.irq_to_vector
@ -167,7 +159,6 @@ struct ia64_machine_vector {
ia64_mv_send_ipi_t *send_ipi;
ia64_mv_timer_interrupt_t *timer_interrupt;
ia64_mv_global_tlb_purge_t *global_tlb_purge;
ia64_mv_tlb_migrate_finish_t *tlb_migrate_finish;
ia64_mv_dma_init *dma_init;
ia64_mv_dma_get_ops *dma_get_ops;
ia64_mv_irq_to_vector *irq_to_vector;
@ -206,7 +197,6 @@ struct ia64_machine_vector {
platform_send_ipi, \
platform_timer_interrupt, \
platform_global_tlb_purge, \
platform_tlb_migrate_finish, \
platform_dma_init, \
platform_dma_get_ops, \
platform_irq_to_vector, \
@ -270,9 +260,6 @@ extern const struct dma_map_ops *dma_get_ops(struct device *);
#ifndef platform_global_tlb_purge
# define platform_global_tlb_purge ia64_global_tlb_purge /* default to architected version */
#endif
#ifndef platform_tlb_migrate_finish
# define platform_tlb_migrate_finish machvec_noop_mm
#endif
#ifndef platform_kernel_launch_event
# define platform_kernel_launch_event machvec_noop
#endif

2
arch/ia64/include/asm/machvec_sn2.h
View File

@ -34,7 +34,6 @@ extern ia64_mv_irq_init_t sn_irq_init;
extern ia64_mv_send_ipi_t sn2_send_IPI;
extern ia64_mv_timer_interrupt_t sn_timer_interrupt;
extern ia64_mv_global_tlb_purge_t sn2_global_tlb_purge;
extern ia64_mv_tlb_migrate_finish_t sn_tlb_migrate_finish;
extern ia64_mv_irq_to_vector sn_irq_to_vector;
extern ia64_mv_local_vector_to_irq sn_local_vector_to_irq;
extern ia64_mv_pci_get_legacy_mem_t sn_pci_get_legacy_mem;
@ -77,7 +76,6 @@ extern ia64_mv_pci_fixup_bus_t sn_pci_fixup_bus;
#define platform_send_ipi sn2_send_IPI
#define platform_timer_interrupt sn_timer_interrupt
#define platform_global_tlb_purge sn2_global_tlb_purge
#define platform_tlb_migrate_finish sn_tlb_migrate_finish
#define platform_pci_fixup sn_pci_fixup
#define platform_inb __sn_inb
#define platform_inw __sn_inw

2
arch/ia64/include/asm/tlb.h
View File

@ -47,8 +47,6 @@
#include <asm/tlbflush.h>
#include <asm/machvec.h>
#define tlb_migrate_finish(mm) platform_tlb_migrate_finish(mm)
#include <asm-generic/tlb.h>
#endif /* _ASM_IA64_TLB_H */

7
arch/ia64/sn/kernel/sn2/sn2_smp.c
View File

@ -120,13 +120,6 @@ void sn_migrate(struct task_struct *task)
cpu_relax();
}
void sn_tlb_migrate_finish(struct mm_struct *mm)
{
/* flush_tlb_mm is inefficient if more than 1 users of mm */
if (mm == current->mm && mm && atomic_read(&mm->mm_users) == 1)
flush_tlb_mm(mm);
}
static void
sn2_ipi_flush_all_tlb(struct mm_struct *mm)
{

1
arch/nds32/include/asm/tlbflush.h
View File

@ -42,6 +42,5 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t * pte);
void tlb_migrate_finish(struct mm_struct *mm);
#endif

4
include/asm-generic/tlb.h
View File

@ -604,8 +604,4 @@ static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm
#endif /* CONFIG_MMU */
#ifndef tlb_migrate_finish
#define tlb_migrate_finish(mm) do {} while (0)
#endif
#endif /* _ASM_GENERIC__TLB_H */

1
kernel/sched/core.c
View File

@ -1151,7 +1151,6 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
/* Need help from migration thread: drop lock and wait. */
task_rq_unlock(rq, p, &rf);
stop_one_cpu(cpu_of(rq), migration_cpu_stop, &arg);
tlb_migrate_finish(p->mm);
return 0;
} else if (task_on_rq_queued(p)) {
/*