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| author | Ira Weiny <ira.weiny@intel.com> | 2023-02-04 07:06:34 +0300 |
|---|---|---|
| committer | Jens Wiklander <jens.wiklander@linaro.org> | 2023-02-13 16:16:40 +0300 |
| commit | 0249a75b365911f91b87935bc08a4795a6fa7dd0 (patch) | |
| tree | 49f9d088d7dfaaa7ae7fc9d8873fa6684c646d5e /mm/swap.c | |
| parent | c83900393aa133d5fefdbf2ab3377c7fbeec0c07 (diff) | |
| download | linux-0249a75b365911f91b87935bc08a4795a6fa7dd0.tar.xz | |
tee: Remove call to get_kernel_pages()
The kernel pages used by shm_get_kernel_pages() are allocated using
GFP_KERNEL through the following call stack:
trusted_instantiate()
trusted_payload_alloc() -> GFP_KERNEL
<trusted key op>
tee_shm_register_kernel_buf()
register_shm_helper()
shm_get_kernel_pages()
Where <trusted key op> is one of:
trusted_key_unseal()
trusted_key_get_random()
trusted_key_seal()
Because the pages can't be from highmem get_kernel_pages() boils down to
a get_page() call.
Remove the get_kernel_pages() call and open code the get_page().
In case a highmem page does slip through warn on once for a kmap'ed
address.
Cc: Jens Wiklander <jens.wiklander@linaro.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'mm/swap.c')
0 files changed, 0 insertions, 0 deletions