* [PATCH] mm: cleanup: remove unused tsk arg from __access_remote_vm
@ 2020-10-26 7:41 John Hubbard
2020-10-26 9:57 ` Mike Rapoport
0 siblings, 1 reply; 2+ messages in thread
From: John Hubbard @ 2020-10-26 7:41 UTC (permalink / raw)
To: Andrew Morton; +Cc: LKML, linux-mm, John Hubbard, Oleg Nesterov
Despite a comment that said that page fault accounting would be charged
to whatever task_struct* was passed into __access_remote_vm(), the tsk
argument was actually unused.
Delete both the comment, and the argument.
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Cc: Oleg Nesterov <oleg@redhat.com>
---
Hi,
Just something that caught my eye when I was reviewing a semi-related
patchset.
thanks,
John Hubbard
NVIDIA
include/linux/mm.h | 4 ++--
kernel/ptrace.c | 2 +-
mm/memory.c | 11 +++++------
mm/nommu.c | 8 ++++----
4 files changed, 12 insertions(+), 13 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ef360fe70aaf..b3b85a5c5937 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1716,8 +1716,8 @@ extern int access_process_vm(struct task_struct *tsk, unsigned long addr,
void *buf, int len, unsigned int gup_flags);
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
void *buf, int len, unsigned int gup_flags);
-extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long addr, void *buf, int len, unsigned int gup_flags);
+extern int __access_remote_vm(struct mm_struct *mm, unsigned long addr,
+ void *buf, int len, unsigned int gup_flags);
long get_user_pages_remote(struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 43d6179508d6..fbbe32443b18 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -57,7 +57,7 @@ int ptrace_access_vm(struct task_struct *tsk, unsigned long addr,
return 0;
}
- ret = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags);
+ ret = __access_remote_vm(mm, addr, buf, len, gup_flags);
mmput(mm);
return ret;
diff --git a/mm/memory.c b/mm/memory.c
index c48f8df6e502..25b28bc251d5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4874,11 +4874,10 @@ EXPORT_SYMBOL_GPL(generic_access_phys);
#endif
/*
- * Access another process' address space as given in mm. If non-NULL, use the
- * given task for page fault accounting.
+ * Access another process' address space as given in mm.
*/
-int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long addr, void *buf, int len, unsigned int gup_flags)
+int __access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf,
+ int len, unsigned int gup_flags)
{
struct vm_area_struct *vma;
void *old_buf = buf;
@@ -4955,7 +4954,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
int access_remote_vm(struct mm_struct *mm, unsigned long addr,
void *buf, int len, unsigned int gup_flags)
{
- return __access_remote_vm(NULL, mm, addr, buf, len, gup_flags);
+ return __access_remote_vm(mm, addr, buf, len, gup_flags);
}
/*
@@ -4973,7 +4972,7 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr,
if (!mm)
return 0;
- ret = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags);
+ ret = __access_remote_vm(mm, addr, buf, len, gup_flags);
mmput(mm);
diff --git a/mm/nommu.c b/mm/nommu.c
index 0faf39b32cdb..870fea12823e 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1675,8 +1675,8 @@ void filemap_map_pages(struct vm_fault *vmf,
}
EXPORT_SYMBOL(filemap_map_pages);
-int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long addr, void *buf, int len, unsigned int gup_flags)
+int __access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf,
+ int len, unsigned int gup_flags)
{
struct vm_area_struct *vma;
int write = gup_flags & FOLL_WRITE;
@@ -1722,7 +1722,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
int access_remote_vm(struct mm_struct *mm, unsigned long addr,
void *buf, int len, unsigned int gup_flags)
{
- return __access_remote_vm(NULL, mm, addr, buf, len, gup_flags);
+ return __access_remote_vm(mm, addr, buf, len, gup_flags);
}
/*
@@ -1741,7 +1741,7 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
if (!mm)
return 0;
- len = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags);
+ len = __access_remote_vm(mm, addr, buf, len, gup_flags);
mmput(mm);
return len;
base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
--
2.29.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] mm: cleanup: remove unused tsk arg from __access_remote_vm
2020-10-26 7:41 [PATCH] mm: cleanup: remove unused tsk arg from __access_remote_vm John Hubbard
@ 2020-10-26 9:57 ` Mike Rapoport
0 siblings, 0 replies; 2+ messages in thread
From: Mike Rapoport @ 2020-10-26 9:57 UTC (permalink / raw)
To: John Hubbard; +Cc: Andrew Morton, LKML, linux-mm, Oleg Nesterov
On Mon, Oct 26, 2020 at 12:41:37AM -0700, John Hubbard wrote:
> Despite a comment that said that page fault accounting would be charged
> to whatever task_struct* was passed into __access_remote_vm(), the tsk
> argument was actually unused.
>
> Delete both the comment, and the argument.
I'd also mention that making page fault accounting actually use this
task struct is quite a project, so there is no point to keep tsk
argument.
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> Cc: Oleg Nesterov <oleg@redhat.com>
FWIW:
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
>
> Hi,
>
> Just something that caught my eye when I was reviewing a semi-related
> patchset.
>
> thanks,
> John Hubbard
> NVIDIA
>
> include/linux/mm.h | 4 ++--
> kernel/ptrace.c | 2 +-
> mm/memory.c | 11 +++++------
> mm/nommu.c | 8 ++++----
> 4 files changed, 12 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ef360fe70aaf..b3b85a5c5937 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1716,8 +1716,8 @@ extern int access_process_vm(struct task_struct *tsk, unsigned long addr,
> void *buf, int len, unsigned int gup_flags);
> extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
> void *buf, int len, unsigned int gup_flags);
> -extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
> - unsigned long addr, void *buf, int len, unsigned int gup_flags);
> +extern int __access_remote_vm(struct mm_struct *mm, unsigned long addr,
> + void *buf, int len, unsigned int gup_flags);
>
> long get_user_pages_remote(struct mm_struct *mm,
> unsigned long start, unsigned long nr_pages,
> diff --git a/kernel/ptrace.c b/kernel/ptrace.c
> index 43d6179508d6..fbbe32443b18 100644
> --- a/kernel/ptrace.c
> +++ b/kernel/ptrace.c
> @@ -57,7 +57,7 @@ int ptrace_access_vm(struct task_struct *tsk, unsigned long addr,
> return 0;
> }
>
> - ret = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags);
> + ret = __access_remote_vm(mm, addr, buf, len, gup_flags);
> mmput(mm);
>
> return ret;
> diff --git a/mm/memory.c b/mm/memory.c
> index c48f8df6e502..25b28bc251d5 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4874,11 +4874,10 @@ EXPORT_SYMBOL_GPL(generic_access_phys);
> #endif
>
> /*
> - * Access another process' address space as given in mm. If non-NULL, use the
> - * given task for page fault accounting.
> + * Access another process' address space as given in mm.
> */
> -int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
> - unsigned long addr, void *buf, int len, unsigned int gup_flags)
> +int __access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf,
> + int len, unsigned int gup_flags)
> {
> struct vm_area_struct *vma;
> void *old_buf = buf;
> @@ -4955,7 +4954,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
> int access_remote_vm(struct mm_struct *mm, unsigned long addr,
> void *buf, int len, unsigned int gup_flags)
> {
> - return __access_remote_vm(NULL, mm, addr, buf, len, gup_flags);
> + return __access_remote_vm(mm, addr, buf, len, gup_flags);
> }
>
> /*
> @@ -4973,7 +4972,7 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr,
> if (!mm)
> return 0;
>
> - ret = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags);
> + ret = __access_remote_vm(mm, addr, buf, len, gup_flags);
>
> mmput(mm);
>
> diff --git a/mm/nommu.c b/mm/nommu.c
> index 0faf39b32cdb..870fea12823e 100644
> --- a/mm/nommu.c
> +++ b/mm/nommu.c
> @@ -1675,8 +1675,8 @@ void filemap_map_pages(struct vm_fault *vmf,
> }
> EXPORT_SYMBOL(filemap_map_pages);
>
> -int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
> - unsigned long addr, void *buf, int len, unsigned int gup_flags)
> +int __access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf,
> + int len, unsigned int gup_flags)
> {
> struct vm_area_struct *vma;
> int write = gup_flags & FOLL_WRITE;
> @@ -1722,7 +1722,7 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
> int access_remote_vm(struct mm_struct *mm, unsigned long addr,
> void *buf, int len, unsigned int gup_flags)
> {
> - return __access_remote_vm(NULL, mm, addr, buf, len, gup_flags);
> + return __access_remote_vm(mm, addr, buf, len, gup_flags);
> }
>
> /*
> @@ -1741,7 +1741,7 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
> if (!mm)
> return 0;
>
> - len = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags);
> + len = __access_remote_vm(mm, addr, buf, len, gup_flags);
>
> mmput(mm);
> return len;
>
> base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
> --
> 2.29.0
>
>
--
Sincerely yours,
Mike.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-10-26 7:41 [PATCH] mm: cleanup: remove unused tsk arg from __access_remote_vm John Hubbard
2020-10-26 9:57 ` Mike Rapoport
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