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Wed, 24 Sep 2025 08:27:28 -0700 (PDT) Date: Wed, 24 Sep 2025 17:26:55 +0200 In-Reply-To: <20250924152651.3328941-9-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: <20250924152651.3328941-9-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=nKwv+wRF8AczbIGiloggDafTMLbsFJ1dEVBDncfmiHo=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeMK7yEN/52J0oxlKw4rvHFWbdru73/z3MPftwrbj0RHO 959ZjKxo5SFQYyLQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEzkz2tGhu18n7TLZn0/d9F9 2enNSjr+8u+U1bwK/1jHv9rbdeyOnTbDP901L/M0p7qkTt3/xy4m0jykxOHNvlcxM6K+lAZurev R4gcA X-Mailer: git-send-email 2.51.0.534.gc79095c0ca-goog Message-ID: <20250924152651.3328941-12-ardb+git@google.com> Subject: [PATCH v4 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 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 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; =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 2.51.0.534.gc79095c0ca-goog