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authorLiam R. Howlett <Liam.Howlett@oracle.com>2023-01-26 16:20:49 -0500
committerAndrew Morton <akpm@linux-foundation.org>2023-02-09 16:51:33 -0800
commit27b267011296e35dd5c983bf6c53b7230c78f383 (patch)
treedf031321caa6afdd9ceb2f0781d220891e10c86c /ipc
parentd60beb1f698a429825ea2c463ee9e3dc3b1a79b7 (diff)
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ipc/shm: introduce new do_vma_munmap() to munmap
The shm already has the vma iterator in position for a write. do_vmi_munmap() searches for the correct position and aligns the write, so it is not the right function to use in this case. The shm VMA tree modification is similar to the brk munmap situation, the vma iterator is in position and the VMA is already known. This patch generalizes the brk munmap function do_brk_munmap() to be used for any other callers with the vma iterator already in position to munmap a VMA. Link: https://lkml.kernel.org/r/20230126212049.980501-1-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Reported-by: Sven Schnelle <svens@linux.ibm.com> Link: https://lore.kernel.org/linux-mm/yt9dh6wec21a.fsf@linux.ibm.com/ Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/shm.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index 1c6a6b319a49..60e45e7045d4 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1786,8 +1786,8 @@ long ksys_shmdt(char __user *shmaddr)
*/
file = vma->vm_file;
size = i_size_read(file_inode(vma->vm_file));
- do_vmi_munmap(&vmi, mm, vma->vm_start,
- vma->vm_end - vma->vm_start, NULL, false);
+ do_vma_munmap(&vmi, vma, vma->vm_start, vma->vm_end,
+ NULL, false);
/*
* We discovered the size of the shm segment, so
* break out of here and fall through to the next
@@ -1810,9 +1810,10 @@ long ksys_shmdt(char __user *shmaddr)
/* finding a matching vma now does not alter retval */
if ((vma->vm_ops == &shm_vm_ops) &&
((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) &&
- (vma->vm_file == file))
- do_vmi_munmap(&vmi, mm, vma->vm_start,
- vma->vm_end - vma->vm_start, NULL, false);
+ (vma->vm_file == file)) {
+ do_vma_munmap(&vmi, vma, vma->vm_start, vma->vm_end,
+ NULL, false);
+ }
vma = vma_next(&vmi);
}