mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-27 12:57:53 +00:00
Code Issues Releases Wiki Activity

mm/memory.c: avoid unnecessary kernel/user pointer conversion

Browse source 
Annotating a pointer from __user to kernel and then back again might
confuse sparse.  In copy_huge_page_from_user() it can be avoided by
removing the intermediate variable since it is never used.

Link: https://lkml.kernel.org/r/20210914150820.19326-1-amit.kachhap@arm.com
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Amit Daniel Kachhap 2021-11-05 13:38:18 -07:00 committed by Linus Torvalds
parent f1dc0db296
commit b063e374e7
1 changed files with 1 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
mm/memory.c
View file

@ -5421,7 +5421,6 @@ long copy_huge_page_from_user(struct page *dst_page,
unsigned int pages_per_huge_page,
bool allow_pagefault)
{
void *src = (void *)usr_src;
void *page_kaddr;
unsigned long i, rc = 0;
unsigned long ret_val = pages_per_huge_page * PAGE_SIZE;
@ -5434,8 +5433,7 @@ long copy_huge_page_from_user(struct page *dst_page,
else
page_kaddr = kmap_atomic(subpage);
rc = copy_from_user(page_kaddr,
(const void __user *)(src + i * PAGE_SIZE),
PAGE_SIZE);
usr_src + i * PAGE_SIZE, PAGE_SIZE);
if (allow_pagefault)
kunmap(subpage);
else