linux-kernel - [PATCH v3 0/2] x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining

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Message-ID: <20250520152938.21881-1-ebiggers@kernel.org>
Date: Tue, 20 May 2025 08:29:36 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	linux-pm@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ayush Jain <Ayush.Jain3@....com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH v3 0/2] x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining

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
-- 
2.49.0