11e456cae9
Commit bc292ab00f6c("mm: introduce vma->vm_flags wrapper functions")
turns the vm_flags into a const variable.
Added bpf_find_vma test in commit f108662b27c9("selftests/bpf: Add tests
for bpf_find_vma") to assign values to variables that declare const in
find_vma_fail1.c programs, which is an error to the compiler and does not
test BPF verifiers. It is better to replace 'const vm_flags_t vm_flags'
with 'unsigned long vm_start' for testing.
$ make -C tools/testing/selftests/bpf/ -j8
...
progs/find_vma_fail1.c:16:16: error: cannot assign to non-static data
member 'vm_flags' with const-qualified type 'const vm_flags_t' (aka
'const unsigned long')
vma->vm_flags |= 0x55;
~~~~~~~~~~~~~ ^
../tools/testing/selftests/bpf/tools/include/vmlinux.h:1898:20:
note: non-static data member 'vm_flags' declared const here
const vm_flags_t vm_flags;
~~~~~~~~~~~`~~~~~~^~~~~~~~
Signed-off-by: Rong Tao <rongtao@cestc.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/tencent_CB281722B3C1BD504C16CDE586CACC2BE706@qq.com
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README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.