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Joanne Koong says: ==================== From: Joanne Koong <joannelkoong@gmail.com> Currently, local storage memory can only be allocated atomically (GFP_ATOMIC). This restriction is too strict for sleepable bpf programs. In this patchset, sleepable programs can allocate memory in local storage using GFP_KERNEL, while non-sleepable programs always default to GFP_ATOMIC. v3 <- v2: * Add extra case to local_storage.c selftest to test associating multiple elements with the local storage, which triggers a GFP_KERNEL allocation in local_storage_update(). * Cast gfp_t to __s32 in verifier to fix the sparse warnings v2 <- v1: * Allocate the memory before/after the raw_spin_lock_irqsave, depending on the gfp flags * Rename mem_flags to gfp_flags * Reword the comment "*mem_flags* is set by the bpf verifier" to "*gfp_flags* is a hidden argument provided by the verifier" * Add a sentence to the commit message about existing local storage selftests covering both the GFP_ATOMIC and GFP_KERNEL paths in bpf_local_storage_update. ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.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.