9f6c6ad161
It turns out that alloc_pages_bulk_array() does not treat the page_array parameter as an output parameter, but rather reads the array and skips any entries that have already been allocated. This is somewhat unexpected and breaks this test, as we allocate the pages array uninitialised on the assumption it will be overwritten. As a result, the test was referencing uninitialised data and causing the PFN to not be valid and thus a WARN_ON() followed by a null pointer deref and panic. In addition, this is an array of pointers not of struct page objects, so we need only allocate an array with elements of pointer size. We solve both problems by simply using kcalloc() and referencing sizeof(struct page *) rather than sizeof(struct page). Link: https://lkml.kernel.org/r/20230524082424.10022-1-lstoakes@gmail.com Fixes: 869cb29a61a1 ("lib/test_vmalloc.c: add vm_map_ram()/vm_unmap_ram() test case") Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by: Baoquan He <bhe@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.