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Wed, 15 Oct 2025 14:01:04 -0700 (PDT) Date: Wed, 15 Oct 2025 22:56:38 +0200 In-Reply-To: <20251015205634.3820870-9-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251015205634.3820870-9-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=901; i=ardb@kernel.org; h=from:subject; bh=3k3eAeRzb5JtIy3mWW+ubq7svhGC8mUZQWnX3o9AW0Q=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeMDV/tegTVS5dfXu18UWPjk1eM+1663m/bMeRC4e7bqM +23r1njOkpZGMS4GGTFFFkEZv99t/P0RKla51myMHNYmUCGMHBxCsBEmOwZ/oqnmq6ITeacf2jG mnnzLl0RqJGM0Df8/FlHNOxjasSsf5MZ/qc/KH/84UNLpdyBY1qtf2/cjU7fssu6aWcD8x4784P vOjkB X-Mailer: git-send-email 2.51.0.869.ge66316f041-goog Message-ID: <20251015205634.3820870-12-ardb+git@google.com> Subject: [PATCH v4 resend 3/7] arm64/fpsimd: Don't warn when EFI execution context is preemptible From: Ard Biesheuvel To: linux-efi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ard Biesheuvel , Will Deacon , Mark Rutland , Sebastian Andrzej Siewior , Peter Zijlstra , Catalin Marinas , Mark Brown , Pierre Gondois , Sami Mujawar Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel Kernel mode FP/SIMD no longer requires preemption to be disabled, so only warn on uses of FP/SIMD from preemptible context if the fallback path is taken for cases where kernel mode NEON would not be allowed otherwise. Signed-off-by: Ard Biesheuvel --- arch/arm64/kernel/fpsimd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index e3f8f51748bc..3d848c89604e 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1934,11 +1934,11 @@ void __efi_fpsimd_begin(void) if (!system_supports_fpsimd()) return; =20 - WARN_ON(preemptible()); - if (may_use_simd()) { kernel_neon_begin(); } else { + WARN_ON(preemptible()); + /* * If !efi_sve_state, SVE can't be in use yet and doesn't need * preserving: --=20 2.51.0.869.ge66316f041-goog