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| author | Ben Wolsieffer <ben.wolsieffer@hefring.com> | 2023-09-15 12:00:56 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-09-19 13:21:34 -0700 |
| commit | fe4419801617514765974f3e796269bc512ad146 (patch) | |
| tree | 1f66cae783c06498ef7ff72c8b9fb3a143b604cb /fs/proc/internal.h | |
| parent | c8be03806738c86521dbf1e0503bc90855fb99a3 (diff) | |
| download | linux-stable-fe4419801617514765974f3e796269bc512ad146.tar.gz linux-stable-fe4419801617514765974f3e796269bc512ad146.tar.bz2 linux-stable-fe4419801617514765974f3e796269bc512ad146.zip | |
proc: nommu: fix empty /proc/<pid>/maps
On no-MMU, /proc/<pid>/maps reads as an empty file. This happens because
find_vma(mm, 0) always returns NULL (assuming no vma actually contains the
zero address, which is normally the case).
To fix this bug and improve the maintainability in the future, this patch
makes the no-MMU implementation as similar as possible to the MMU
implementation.
The only remaining differences are the lack of hold/release_task_mempolicy
and the extra code to shoehorn the gate vma into the iterator.
This has been tested on top of 6.5.3 on an STM32F746.
Link: https://lkml.kernel.org/r/20230915160055.971059-2-ben.wolsieffer@hefring.com
Fixes: 0c563f148043 ("proc: remove VMA rbtree use from nommu")
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/proc/internal.h')
| -rw-r--r-- | fs/proc/internal.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 9dda7e54b2d0..9a8f32f21ff5 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -289,9 +289,7 @@ struct proc_maps_private { struct inode *inode; struct task_struct *task; struct mm_struct *mm; -#ifdef CONFIG_MMU struct vma_iterator iter; -#endif #ifdef CONFIG_NUMA struct mempolicy *task_mempolicy; #endif |