[PATCH v2 bpf 0/3] vmalloc: bpf: introduce VM_ALLOW_HUGE_VMAP

[Song Liu <song@kernel.org>]

Changes v1 => v2:
1. Add vmalloc_huge(). (Christoph Hellwig)
2. Add module_alloc_huge(). (Christoph Hellwig)
3. Add Fixes tag and Link tag. (Thorsten Leemhuis)

Enabling HAVE_ARCH_HUGE_VMALLOC on x86_64 and use it for bpf_prog_pack has
caused some issues [1], as many users of vmalloc are not yet ready to
handle huge pages. To enable a more smooth transition to use huge page
backed vmalloc memory, this set replaces VM_NO_HUGE_VMAP flag with an new
opt-in flag, VM_ALLOW_HUGE_VMAP. More discussions about this topic can be
found at [2].

Patch 1 removes VM_NO_HUGE_VMAP and adds VM_ALLOW_HUGE_VMAP.
Patch 2 uses VM_ALLOW_HUGE_VMAP in bpf_prog_pack.

[1] https://lore.kernel.org/lkml/20220204185742.271030-1-song@kernel.org/
[2] https://lore.kernel.org/linux-mm/20220330225642.1163897-1-song@kernel.org/

Song Liu (3):
  vmalloc: replace VM_NO_HUGE_VMAP with VM_ALLOW_HUGE_VMAP
  module: introduce module_alloc_huge
  bpf: use vmalloc with VM_ALLOW_HUGE_VMAP for bpf_prog_pack

 arch/Kconfig                 |  6 ++----
 arch/powerpc/kernel/module.c |  2 +-
 arch/s390/kvm/pv.c           |  2 +-
 arch/x86/kernel/module.c     | 21 +++++++++++++++++++
 include/linux/moduleloader.h |  5 +++++
 include/linux/vmalloc.h      |  4 ++--
 kernel/bpf/core.c            |  9 +++++----
 kernel/module.c              |  8 ++++++++
 mm/vmalloc.c                 | 39 +++++++++++++++++++-----------------
 9 files changed, 66 insertions(+), 30 deletions(-)

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2.30.2