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Fri, 05 Sep 2025 06:30:51 -0700 (PDT) Date: Fri, 5 Sep 2025 15:30:40 +0200 In-Reply-To: <20250905133035.275517-9-ardb+git@google.com> Mime-Version: 1.0 References: <20250905133035.275517-9-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=ymeoG2jyFnfZxHt/XMud96BPHY4rNxDq3fGtVI/uoN4=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIWPX0/86gcet7k75+ikp4N/VlzWbwz3MFzX3nZsSJbTfe Mrlys9+HaUsDGJcDLJiiiwCs/++23l6olSt8yxZmDmsTCBDGLg4BWAiLa8Z/ukpNH9K793d5xX9 gO3t6erK2Tt3XzghVfr337TlRnsmpzcyMvTJHGnzzFyjnTCjaMLd7e8XO6x7ZlfDxzbt1OKi0lP dqxgB X-Mailer: git-send-email 2.51.0.355.g5224444f11-goog Message-ID: <20250905133035.275517-13-ardb+git@google.com> Subject: [PATCH v2 4/7] 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 Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250905_063052_904827_8FD230A8 X-CRM114-Status: GOOD ( 13.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 c37f02d7194e..d26a02ea2bb9 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1933,11 +1933,11 @@ void __efi_fpsimd_begin(void) if (!system_supports_fpsimd()) return; - 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: -- 2.51.0.355.g5224444f11-goog