mbox series

[v3,0/2] x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining

Message ID 20250520152938.21881-1-ebiggers@kernel.org
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Series x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining | expand

Message

Eric Biggers May 20, 2025, 3:29 p.m. UTC 
This series fixes a crash in the SHA-256 code during hotplug CPU
onlining.

Changed in v3:
  - Split into two patches, as requested by Ingo.
Changed in v2:
  - Add WARN_ON_FPU when kernel_fpu_allowed has unexpected value in
    fpu__init_cpu() or cpu_disable_common().  Since WARN_ON_FPU is
    defined in fpu/internal.h which should not be included by smpboot.c,
    made cpu_disable_common() call a new function fpu__disable_cpu().
  - Added Tested-by.

Eric Biggers (2):
  x86/fpu: Replace in_kernel_fpu with kernel_fpu_allowed
  x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining

 arch/x86/include/asm/fpu/api.h |  1 +
 arch/x86/kernel/fpu/core.c     | 34 +++++++++++++++++++++-------------
 arch/x86/kernel/fpu/init.c     | 13 +++++++++++++
 arch/x86/kernel/fpu/internal.h |  2 ++
 arch/x86/kernel/smpboot.c      |  6 ++++++
 5 files changed, 43 insertions(+), 13 deletions(-)


base-commit: 3ee84e3dd88e39b55b534e17a7b9a181f1d46809