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generate_test_data() acquires a page with alloc_page(GFP_KERNEL). The GFP_KERNEL is typical for kernel-internal allocations. The caller requires ZONE_NORMAL or a lower zone for direct access. Therefore the page cannot come from ZONE_HIGHMEM. Thus there's no need to map it with kmap(). Also, the kmap() is being deprecated in favor of kmap_local_page() [1]. Hence, use a plain page_address() directly. Since the page passed to the page_address() is not from the highmem zone, the page_address() function will always return a valid kernel virtual address and will not return NULL. Hence, remove the check 'if (!ptr)'. Remove the unused variable 'ptr' and label 'err_free_page'. [1] https://lore.kernel.org/all/20220813220034.806698-1-ira.weiny@intel.com/ Reported-by: kernel test robot <lkp@intel.com> Suggested-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Signed-off-by: Sumitra Sharma <sumitraartsy@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/bpf/20230623151644.GA434468@sumitra.com
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.