[PATCH 26/26] mm/gup: Remove task_struct pointer for all gup code

Peter Xu
2020-06-19T16:15:47Z

After the cleanup of page fault accounting, gup does not need to pass
task_struct around any more. Remove that parameter in the whole gup stack.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
arch/arc/kernel/process.c | 2 +-
arch/s390/kvm/interrupt.c | 2 +-
arch/s390/kvm/kvm-s390.c | 2 +-
arch/s390/kvm/priv.c | 8 +-
arch/s390/mm/gmap.c | 4 +-
drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 2 +-
drivers/infiniband/core/umem_odp.c | 2 +-
drivers/vfio/vfio_iommu_type1.c | 2 +-
fs/exec.c | 2 +-
include/linux/mm.h | 9 +--
kernel/events/uprobes.c | 6 +-
kernel/futex.c | 2 +-
mm/gup.c | 90 +++++++++------------
mm/memory.c | 2 +-
mm/process_vm_access.c | 2 +-
security/tomoyo/domain.c | 2 +-
virt/kvm/async_pf.c | 2 +-
virt/kvm/kvm_main.c | 2 +-
18 files changed, 63 insertions(+), 80 deletions(-)

diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 315528f04bc1..2aad79ffc7f8 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -91,7 +91,7 @@ SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int, expected, int, new)
goto fail;

down_read(&current->mm->mmap_sem);
- ret = fixup_user_fault(current, current->mm, (unsigned long) uaddr,
+ ret = fixup_user_fault(current->mm, (unsigned long) uaddr,
FAULT_FLAG_WRITE, NULL);
up_read(&current->mm->mmap_sem);

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index bfb481134994..7f4c5895aabd 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2768,7 +2768,7 @@ static struct page *get_map_page(struct kvm *kvm, u64 uaddr)
struct page *page = NULL;

down_read(&kvm->mm->mmap_sem);
- get_user_pages_remote(NULL, kvm->mm, uaddr, 1, FOLL_WRITE,
+ get_user_pages_remote(kvm->mm, uaddr, 1, FOLL_WRITE,
&page, NULL, NULL);
up_read(&kvm->mm->mmap_sem);
return page;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d05bb040fd42..12fa299986f8 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1892,7 +1892,7 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)

r = set_guest_storage_key(current->mm, hva, keys[i], 0);
if (r) {
- r = fixup_user_fault(current, current->mm, hva,
+ r = fixup_user_fault(current->mm, hva,
FAULT_FLAG_WRITE, &unlocked);
if (r)
break;
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 893893642415..45b7d5df72d7 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -274,7 +274,7 @@ static int handle_iske(struct kvm_vcpu *vcpu)
rc = get_guest_storage_key(current->mm, vmaddr, &key);

if (rc) {
- rc = fixup_user_fault(current, current->mm, vmaddr,
+ rc = fixup_user_fault(current->mm, vmaddr,
FAULT_FLAG_WRITE, &unlocked);
if (!rc) {
up_read(&current->mm->mmap_sem);
@@ -320,7 +320,7 @@ static int handle_rrbe(struct kvm_vcpu *vcpu)
down_read(&current->mm->mmap_sem);
rc = reset_guest_reference_bit(current->mm, vmaddr);
if (rc < 0) {
- rc = fixup_user_fault(current, current->mm, vmaddr,
+ rc = fixup_user_fault(current->mm, vmaddr,
FAULT_FLAG_WRITE, &unlocked);
if (!rc) {
up_read(&current->mm->mmap_sem);
@@ -391,7 +391,7 @@ static int handle_sske(struct kvm_vcpu *vcpu)
m3 & SSKE_MC);

if (rc < 0) {
- rc = fixup_user_fault(current, current->mm, vmaddr,
+ rc = fixup_user_fault(current->mm, vmaddr,
FAULT_FLAG_WRITE, &unlocked);
rc = !rc ? -EAGAIN : rc;
}
@@ -1095,7 +1095,7 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
rc = cond_set_guest_storage_key(current->mm, vmaddr,
key, NULL, nq, mr, mc);
if (rc < 0) {
- rc = fixup_user_fault(current, current->mm, vmaddr,
+ rc = fixup_user_fault(current->mm, vmaddr,
FAULT_FLAG_WRITE, &unlocked);
rc = !rc ? -EAGAIN : rc;
}
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 1a95d8809cc3..0faf4f5f3fd4 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -649,7 +649,7 @@ int gmap_fault(struct gmap *gmap, unsigned long gaddr,
rc = vmaddr;
goto out_up;
}
- if (fixup_user_fault(current, gmap->mm, vmaddr, fault_flags,
+ if (fixup_user_fault(gmap->mm, vmaddr, fault_flags,
&unlocked)) {
rc = -EFAULT;
goto out_up;
@@ -879,7 +879,7 @@ static int gmap_pte_op_fixup(struct gmap *gmap, unsigned long gaddr,

BUG_ON(gmap_is_shadow(gmap));
fault_flags = (prot == PROT_WRITE) ? FAULT_FLAG_WRITE : 0;
- if (fixup_user_fault(current, mm, vmaddr, fault_flags, &unlocked))
+ if (fixup_user_fault(mm, vmaddr, fault_flags, &unlocked))
return -EFAULT;
if (unlocked)
/* lost mmap_sem, caller has to retry __gmap_translate */
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 7ffd7afeb7a5..e87fa79c18d5 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -472,7 +472,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
locked = 1;
}
ret = get_user_pages_remote
- (work->task, mm,
+ (mm,
obj->userptr.ptr + pinned * PAGE_SIZE,
npages - pinned,
flags,
diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
index 3b1e627d9a8d..73b1a01b7339 100644
--- a/drivers/infiniband/core/umem_odp.c
+++ b/drivers/infiniband/core/umem_odp.c
@@ -437,7 +437,7 @@ int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 user_virt,
* complex (and doesn't gain us much performance in most use
* cases).
*/
- npages = get_user_pages_remote(owning_process, owning_mm,
+ npages = get_user_pages_remote(owning_mm,
user_virt, gup_num_pages,
flags, local_page_list, NULL, NULL);
up_read(&owning_mm->mmap_sem);
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index cc1d64765ce7..d77b34d6ee19 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -329,7 +329,7 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr,
flags |= FOLL_WRITE;

down_read(&mm->mmap_sem);
- ret = pin_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM,
+ ret = pin_user_pages_remote(mm, vaddr, 1, flags | FOLL_LONGTERM,
page, NULL, NULL);
if (ret == 1) {
*pfn = page_to_pfn(page[0]);
diff --git a/fs/exec.c b/fs/exec.c
index 2c465119affc..f3f87911f3d0 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -213,7 +213,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
* We are doing an exec(). 'current' is the process
* doing the exec and bprm->mm is the new process's mm.
*/
- ret = get_user_pages_remote(current, bprm->mm, pos, 1, gup_flags,
+ ret = get_user_pages_remote(bprm->mm, pos, 1, gup_flags,
&page, NULL, NULL);
if (ret <= 0)
return NULL;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 46bee4044ac1..5e347ffb049f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1655,7 +1655,7 @@ int invalidate_inode_page(struct page *page);
extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma,
unsigned long address, unsigned int flags,
struct pt_regs *regs);
-extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
+extern int fixup_user_fault(struct mm_struct *mm,
unsigned long address, unsigned int fault_flags,
bool *unlocked);
void unmap_mapping_pages(struct address_space *mapping,
@@ -1671,8 +1671,7 @@ static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma,
BUG();
return VM_FAULT_SIGBUS;
}
-static inline int fixup_user_fault(struct task_struct *tsk,
- struct mm_struct *mm, unsigned long address,
+static inline int fixup_user_fault(struct mm_struct *mm, unsigned long address,
unsigned int fault_flags, bool *unlocked)
{
/* should never happen if there's no MMU */
@@ -1698,11 +1697,11 @@ extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
unsigned long addr, void *buf, int len, unsigned int gup_flags);

-long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+long get_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked);
-long pin_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+long pin_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked);
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ece7e13f6e4a..b7c9ad7e7d54 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -382,7 +382,7 @@ __update_ref_ctr(struct mm_struct *mm, unsigned long vaddr, short d)
if (!vaddr || !d)
return -EINVAL;

- ret = get_user_pages_remote(NULL, mm, vaddr, 1,
+ ret = get_user_pages_remote(mm, vaddr, 1,
FOLL_WRITE, &page, &vma, NULL);
if (unlikely(ret <= 0)) {
/*
@@ -483,7 +483,7 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
if (is_register)
gup_flags |= FOLL_SPLIT_PMD;
/* Read the page with vaddr into memory */
- ret = get_user_pages_remote(NULL, mm, vaddr, 1, gup_flags,
+ ret = get_user_pages_remote(mm, vaddr, 1, gup_flags,
&old_page, &vma, NULL);
if (ret <= 0)
return ret;
@@ -2027,7 +2027,7 @@ static int is_trap_at_addr(struct mm_struct *mm, unsigned long vaddr)
* but we treat this as a 'remote' access since it is
* essentially a kernel access to the memory.
*/
- result = get_user_pages_remote(NULL, mm, vaddr, 1, FOLL_FORCE, &page,
+ result = get_user_pages_remote(mm, vaddr, 1, FOLL_FORCE, &page,
NULL, NULL);
if (result < 0)
return result;
diff --git a/kernel/futex.c b/kernel/futex.c
index b59532862bc0..1466b4322491 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -696,7 +696,7 @@ static int fault_in_user_writeable(u32 __user *uaddr)
int ret;

down_read(&mm->mmap_sem);
- ret = fixup_user_fault(current, mm, (unsigned long)uaddr,
+ ret = fixup_user_fault(mm, (unsigned long)uaddr,
FAULT_FLAG_WRITE, NULL);
up_read(&mm->mmap_sem);

diff --git a/mm/gup.c b/mm/gup.c
index 17b4d0c45a6b..b8eb02673c10 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -851,7 +851,7 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
* does not include FOLL_NOWAIT, the mmap_sem may be released. If it
* is, *@locked will be set to 0 and -EBUSY returned.
*/
-static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
+static int faultin_page(struct vm_area_struct *vma,
unsigned long address, unsigned int *flags, int *locked)
{
unsigned int fault_flags = 0;
@@ -954,7 +954,6 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)

/**
* __get_user_pages() - pin user pages in memory
- * @tsk: task_struct of target task
* @mm: mm_struct of target mm
* @start: starting user address
* @nr_pages: number of pages from start to pin
@@ -1012,7 +1011,7 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
* instead of __get_user_pages. __get_user_pages should be used only if
* you need some special @gup_flags.
*/
-static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+static long __get_user_pages(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked)
@@ -1088,8 +1087,7 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,

page = follow_page_mask(vma, start, foll_flags, &ctx);
if (!page) {
- ret = faultin_page(tsk, vma, start, &foll_flags,
- locked);
+ ret = faultin_page(vma, start, &foll_flags, locked);
switch (ret) {
case 0:
goto retry;
@@ -1163,8 +1161,6 @@ static bool vma_permits_fault(struct vm_area_struct *vma,

/*
* fixup_user_fault() - manually resolve a user page fault
- * @tsk: the task_struct to use for page fault accounting, or
- * NULL if faults are not to be recorded.
* @mm: mm_struct of target mm
* @address: user address
* @fault_flags:flags to pass down to handle_mm_fault()
@@ -1191,7 +1187,7 @@ static bool vma_permits_fault(struct vm_area_struct *vma,
* This function will not return with an unlocked mmap_sem. So it has not the
* same semantics wrt the @mm->mmap_sem as does filemap_fault().
*/
-int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
+int fixup_user_fault(struct mm_struct *mm,
unsigned long address, unsigned int fault_flags,
bool *unlocked)
{
@@ -1236,8 +1232,7 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
}
EXPORT_SYMBOL_GPL(fixup_user_fault);

-static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
- struct mm_struct *mm,
+static __always_inline long __get_user_pages_locked(struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
struct page **pages,
@@ -1270,7 +1265,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
pages_done = 0;
lock_dropped = false;
for (;;) {
- ret = __get_user_pages(tsk, mm, start, nr_pages, flags, pages,
+ ret = __get_user_pages(mm, start, nr_pages, flags, pages,
vmas, locked);
if (!locked)
/* VM_FAULT_RETRY couldn't trigger, bypass */
@@ -1330,7 +1325,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
}

*locked = 1;
- ret = __get_user_pages(tsk, mm, start, 1, flags | FOLL_TRIED,
+ ret = __get_user_pages(mm, start, 1, flags | FOLL_TRIED,
pages, NULL, locked);
if (!*locked) {
/* Continue to retry until we succeeded */
@@ -1416,7 +1411,7 @@ long populate_vma_page_range(struct vm_area_struct *vma,
* We made sure addr is within a VMA, so the following will
* not result in a stack expansion that recurses back here.
*/
- return __get_user_pages(current, mm, start, nr_pages, gup_flags,
+ return __get_user_pages(mm, start, nr_pages, gup_flags,
NULL, NULL, locked);
}

@@ -1500,7 +1495,7 @@ struct page *get_dump_page(unsigned long addr)
struct vm_area_struct *vma;
struct page *page;

- if (__get_user_pages(current, current->mm, addr, 1,
+ if (__get_user_pages(current->mm, addr, 1,
FOLL_FORCE | FOLL_DUMP | FOLL_GET, &page, &vma,
NULL) < 1)
return NULL;
@@ -1509,8 +1504,7 @@ struct page *get_dump_page(unsigned long addr)
}
#endif /* CONFIG_ELF_CORE */
#else /* CONFIG_MMU */
-static long __get_user_pages_locked(struct task_struct *tsk,
- struct mm_struct *mm, unsigned long start,
+static long __get_user_pages_locked(struct mm_struct *mm, unsigned long start,
unsigned long nr_pages, struct page **pages,
struct vm_area_struct **vmas, int *locked,
unsigned int foll_flags)
@@ -1626,8 +1620,7 @@ static struct page *new_non_cma_page(struct page *page, unsigned long private)
return __alloc_pages_node(nid, gfp_mask, 0);
}

-static long check_and_migrate_cma_pages(struct task_struct *tsk,
- struct mm_struct *mm,
+static long check_and_migrate_cma_pages(struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
struct page **pages,
@@ -1701,7 +1694,7 @@ static long check_and_migrate_cma_pages(struct task_struct *tsk,
* again migrating any new CMA pages which we failed to isolate
* earlier.
*/
- ret = __get_user_pages_locked(tsk, mm, start, nr_pages,
+ ret = __get_user_pages_locked(mm, start, nr_pages,
pages, vmas, NULL,
gup_flags);

@@ -1715,8 +1708,7 @@ static long check_and_migrate_cma_pages(struct task_struct *tsk,
return ret;
}
#else
-static long check_and_migrate_cma_pages(struct task_struct *tsk,
- struct mm_struct *mm,
+static long check_and_migrate_cma_pages(struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
struct page **pages,
@@ -1731,8 +1723,7 @@ static long check_and_migrate_cma_pages(struct task_struct *tsk,
* __gup_longterm_locked() is a wrapper for __get_user_pages_locked which
* allows us to process the FOLL_LONGTERM flag.
*/
-static long __gup_longterm_locked(struct task_struct *tsk,
- struct mm_struct *mm,
+static long __gup_longterm_locked(struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
struct page **pages,
@@ -1757,7 +1748,7 @@ static long __gup_longterm_locked(struct task_struct *tsk,
flags = memalloc_nocma_save();
}

- rc = __get_user_pages_locked(tsk, mm, start, nr_pages, pages,
+ rc = __get_user_pages_locked(mm, start, nr_pages, pages,
vmas_tmp, NULL, gup_flags);

if (gup_flags & FOLL_LONGTERM) {
@@ -1772,7 +1763,7 @@ static long __gup_longterm_locked(struct task_struct *tsk,
goto out;
}

- rc = check_and_migrate_cma_pages(tsk, mm, start, rc, pages,
+ rc = check_and_migrate_cma_pages(mm, start, rc, pages,
vmas_tmp, gup_flags);
}

@@ -1782,22 +1773,20 @@ static long __gup_longterm_locked(struct task_struct *tsk,
return rc;
}
#else /* !CONFIG_FS_DAX && !CONFIG_CMA */
-static __always_inline long __gup_longterm_locked(struct task_struct *tsk,
- struct mm_struct *mm,
+static __always_inline long __gup_longterm_locked(struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
struct page **pages,
struct vm_area_struct **vmas,
unsigned int flags)
{
- return __get_user_pages_locked(tsk, mm, start, nr_pages, pages, vmas,
+ return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
NULL, flags);
}
#endif /* CONFIG_FS_DAX || CONFIG_CMA */

#ifdef CONFIG_MMU
-static long __get_user_pages_remote(struct task_struct *tsk,
- struct mm_struct *mm,
+static long __get_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked)
@@ -1816,20 +1805,18 @@ static long __get_user_pages_remote(struct task_struct *tsk,
* This will check the vmas (even if our vmas arg is NULL)
* and return -ENOTSUPP if DAX isn't allowed in this case:
*/
- return __gup_longterm_locked(tsk, mm, start, nr_pages, pages,
+ return __gup_longterm_locked(mm, start, nr_pages, pages,
vmas, gup_flags | FOLL_TOUCH |
FOLL_REMOTE);
}

- return __get_user_pages_locked(tsk, mm, start, nr_pages, pages, vmas,
+ return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
locked,
gup_flags | FOLL_TOUCH | FOLL_REMOTE);
}

/*
* get_user_pages_remote() - pin user pages in memory
- * @tsk: the task_struct to use for page fault accounting, or
- * NULL if faults are not to be recorded.
* @mm: mm_struct of target mm
* @start: starting user address
* @nr_pages: number of pages from start to pin
@@ -1888,7 +1875,7 @@ static long __get_user_pages_remote(struct task_struct *tsk,
* should use get_user_pages because it cannot pass
* FAULT_FLAG_ALLOW_RETRY to handle_mm_fault.
*/
-long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+long get_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked)
@@ -1900,13 +1887,13 @@ long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
if (WARN_ON_ONCE(gup_flags & FOLL_PIN))
return -EINVAL;

- return __get_user_pages_remote(tsk, mm, start, nr_pages, gup_flags,
+ return __get_user_pages_remote(mm, start, nr_pages, gup_flags,
pages, vmas, locked);
}
EXPORT_SYMBOL(get_user_pages_remote);

#else /* CONFIG_MMU */
-long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+long get_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked)
@@ -1914,8 +1901,7 @@ long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
return 0;
}

-static long __get_user_pages_remote(struct task_struct *tsk,
- struct mm_struct *mm,
+static long __get_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked)
@@ -1942,7 +1928,7 @@ long get_user_pages(unsigned long start, unsigned long nr_pages,
if (WARN_ON_ONCE(gup_flags & FOLL_PIN))
return -EINVAL;

- return __gup_longterm_locked(current, current->mm, start, nr_pages,
+ return __gup_longterm_locked(current->mm, start, nr_pages,
pages, vmas, gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages);
@@ -1956,7 +1942,7 @@ EXPORT_SYMBOL(get_user_pages);
*
* down_read(&mm->mmap_sem);
* do_something()
- * get_user_pages(tsk, mm, ..., pages, NULL);
+ * get_user_pages(mm, ..., pages, NULL);
* up_read(&mm->mmap_sem);
*
* to:
@@ -1964,7 +1950,7 @@ EXPORT_SYMBOL(get_user_pages);
* int locked = 1;
* down_read(&mm->mmap_sem);
* do_something()
- * get_user_pages_locked(tsk, mm, ..., pages, &locked);
+ * get_user_pages_locked(mm, ..., pages, &locked);
* if (locked)
* up_read(&mm->mmap_sem);
*/
@@ -1981,7 +1967,7 @@ long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM))
return -EINVAL;

- return __get_user_pages_locked(current, current->mm, start, nr_pages,
+ return __get_user_pages_locked(current->mm, start, nr_pages,
pages, NULL, locked,
gup_flags | FOLL_TOUCH);
}
@@ -1991,12 +1977,12 @@ EXPORT_SYMBOL(get_user_pages_locked);
* get_user_pages_unlocked() is suitable to replace the form:
*
* down_read(&mm->mmap_sem);
- * get_user_pages(tsk, mm, ..., pages, NULL);
+ * get_user_pages(mm, ..., pages, NULL);
* up_read(&mm->mmap_sem);
*
* with:
*
- * get_user_pages_unlocked(tsk, mm, ..., pages);
+ * get_user_pages_unlocked(mm, ..., pages);
*
* It is functionally equivalent to get_user_pages_fast so
* get_user_pages_fast should be used instead if specific gup_flags
@@ -2019,7 +2005,7 @@ long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
return -EINVAL;

down_read(&mm->mmap_sem);
- ret = __get_user_pages_locked(current, mm, start, nr_pages, pages, NULL,
+ ret = __get_user_pages_locked(mm, start, nr_pages, pages, NULL,
&locked, gup_flags | FOLL_TOUCH);
if (locked)
up_read(&mm->mmap_sem);
@@ -2720,7 +2706,7 @@ static int __gup_longterm_unlocked(unsigned long start, int nr_pages,
*/
if (gup_flags & FOLL_LONGTERM) {
down_read(&current->mm->mmap_sem);
- ret = __gup_longterm_locked(current, current->mm,
+ ret = __gup_longterm_locked(current->mm,
start, nr_pages,
pages, NULL, gup_flags);
up_read(&current->mm->mmap_sem);
@@ -2850,10 +2836,8 @@ int pin_user_pages_fast(unsigned long start, int nr_pages,
EXPORT_SYMBOL_GPL(pin_user_pages_fast);

/**
- * pin_user_pages_remote() - pin pages of a remote process (task != current)
+ * pin_user_pages_remote() - pin pages of a remote process
*
- * @tsk: the task_struct to use for page fault accounting, or
- * NULL if faults are not to be recorded.
* @mm: mm_struct of target mm
* @start: starting user address
* @nr_pages: number of pages from start to pin
@@ -2877,7 +2861,7 @@ EXPORT_SYMBOL_GPL(pin_user_pages_fast);
* This is intended for Case 1 (DIO) in Documentation/vm/pin_user_pages.rst. It
* is NOT intended for Case 2 (RDMA: long-term pins).
*/
-long pin_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+long pin_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas, int *locked)
@@ -2887,7 +2871,7 @@ long pin_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
return -EINVAL;

gup_flags |= FOLL_PIN;
- return __get_user_pages_remote(tsk, mm, start, nr_pages, gup_flags,
+ return __get_user_pages_remote(mm, start, nr_pages, gup_flags,
pages, vmas, locked);
}
EXPORT_SYMBOL(pin_user_pages_remote);
@@ -2922,7 +2906,7 @@ long pin_user_pages(unsigned long start, unsigned long nr_pages,
return -EINVAL;

gup_flags |= FOLL_PIN;
- return __gup_longterm_locked(current, current->mm, start, nr_pages,
+ return __gup_longterm_locked(current->mm, start, nr_pages,
pages, vmas, gup_flags);
}
EXPORT_SYMBOL(pin_user_pages);
diff --git a/mm/memory.c b/mm/memory.c
index 59a2989231fa..5af912cabe9a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4742,7 +4742,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
void *maddr;
struct page *page = NULL;

- ret = get_user_pages_remote(tsk, mm, addr, 1,
+ ret = get_user_pages_remote(mm, addr, 1,
gup_flags, &page, &vma, NULL);
if (ret <= 0) {
#ifndef CONFIG_HAVE_IOREMAP_PROT
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 74e957e302fe..5523464d0ab5 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -105,7 +105,7 @@ static int process_vm_rw_single_vec(unsigned long addr,
* current/current->mm
*/
down_read(&mm->mmap_sem);
- pinned_pages = pin_user_pages_remote(task, mm, pa, pinned_pages,
+ pinned_pages = pin_user_pages_remote(mm, pa, pinned_pages,
flags, process_pages,
NULL, &locked);
if (locked)
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 7869d6a9980b..afe5e68ede77 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -914,7 +914,7 @@ bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
* (represented by bprm). 'current' is the process doing
* the execve().
*/
- if (get_user_pages_remote(current, bprm->mm, pos, 1,
+ if (get_user_pages_remote(bprm->mm, pos, 1,
FOLL_FORCE, &page, NULL, NULL) <= 0)
return false;
#else
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 15e5b037f92d..73098e18baaf 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -60,7 +60,7 @@ static void async_pf_execute(struct work_struct *work)
* access remotely.
*/
down_read(&mm->mmap_sem);
- get_user_pages_remote(NULL, mm, addr, 1, FOLL_WRITE, NULL, NULL,
+ get_user_pages_remote(mm, addr, 1, FOLL_WRITE, NULL, NULL,
&locked);
if (locked)
up_read(&mm->mmap_sem);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 731c1e517716..3e1b2ec4ec96 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1829,7 +1829,7 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
* not call the fault handler, so do it here.
*/
bool unlocked = false;
- r = fixup_user_fault(current, current->mm, addr,
+ r = fixup_user_fault(current->mm, addr,
(write_fault ? FAULT_FLAG_WRITE : 0),
&unlocked);
if (unlocked)
--
2.26.2