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c43cfa4254
Patch series "various improvements to the GUP interface", v2. A series of fixes to simplify and improve the GUP interface with an eye to providing groundwork to future improvements:- * __access_remote_vm() and access_remote_vm() are functionally identical, so make the former static such that in future we can potentially change the external-facing implementation details of this function. * Extend is_valid_gup_args() to cover the missing FOLL_TOUCH case, and simplify things by defining INTERNAL_GUP_FLAGS to check against. * Adjust __get_user_pages_locked() to explicitly treat a failure to pin any pages as an error in all circumstances other than FOLL_NOWAIT being specified, bringing it in line with the nommu implementation of this function. * (With many thanks to Arnd who suggested this in the first instance) Update get_user_page_vma_remote() to explicitly only return a page or an error, simplifying the interface and avoiding the questionable IS_ERR_OR_NULL() pattern. This patch (of 4): access_remote_vm() passes through parameters to __access_remote_vm() directly, so remove the __access_remote_vm() function from mm.h and use access_remote_vm() in the one caller that needs it (ptrace_access_vm()). This allows future adjustments to the GUP-internal __access_remote_vm() function while keeping the access_remote_vm() function stable. Link: https://lkml.kernel.org/r/cover.1696288092.git.lstoakes@gmail.com Link: https://lkml.kernel.org/r/f7877c5039ce1c202a514a8aeeefc5cdd5e32d19.1696288092.git.lstoakes@gmail.com Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Will Deacon <will@kernel.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.