The patch titled
Subject: mm/mmap.c: use IS_ERR_VALUE to check return value of get_unmapped_area
has been added to the -mm tree. Its filename is
mm-mmapc-use-is_err_value-to-check-return-value-of-get_unmapped_area.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mmapc-use-is_err_value-to-check-return-value-of-get_unmapped_area.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mmapc-use-is_err_value-to-check-return-value-of-get_unmapped_area.patch
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------------------------------------------------------
From: Gaowei Pu <pugaowei@xxxxxxxxx>
Subject: mm/mmap.c: use IS_ERR_VALUE to check return value of get_unmapped_area
get_unmapped_area() returns an address or -errno on failure. Historically
we have checked for the failure by offset_in_page() which is correct but
quite hard to read. Newer code started using IS_ERR_VALUE which is much
easier to read. Convert remaining users of offset_in_page as well.
[mhocko@xxxxxxxx: rewrite changelog]
Link: http://lkml.kernel.org/r/20191012102512.28051-1-pugaowei@xxxxxxxxx
Signed-off-by: Gaowei Pu <pugaowei@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/mm/mmap.c~mm-mmapc-use-is_err_value-to-check-return-value-of-get_unmapped_area
+++ a/mm/mmap.c
@@ -1417,7 +1417,7 @@ unsigned long do_mmap(struct file *file,
* that it represents a valid section of the address space.
*/
addr = get_unmapped_area(file, addr, len, pgoff, flags);
- if (offset_in_page(addr))
+ if (IS_ERR_VALUE(addr))
return addr;
if (flags & MAP_FIXED_NOREPLACE) {
@@ -2996,15 +2996,16 @@ static int do_brk_flags(unsigned long ad
struct rb_node **rb_link, *rb_parent;
pgoff_t pgoff = addr >> PAGE_SHIFT;
int error;
+ unsigned long mapped_addr;
/* Until we need other flags, refuse anything except VM_EXEC. */
if ((flags & (~VM_EXEC)) != 0)
return -EINVAL;
flags |= VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
- error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED);
- if (offset_in_page(error))
- return error;
+ mapped_addr = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED);
+ if (IS_ERR_VALUE(mapped_addr))
+ return mapped_addr;
error = mlock_future_check(mm, mm->def_flags, len);
if (error)
_
Patches currently in -mm which might be from pugaowei@xxxxxxxxx are
mm-mmapc-use-is_err_value-to-check-return-value-of-get_unmapped_area.patch
