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Wed, 14 May 2025 10:44:03 -0700 (PDT) Date: Wed, 14 May 2025 19:43:44 +0200 In-Reply-To: <20250514174339.1834871-9-ardb+git@google.com> Mime-Version: 1.0 References: <20250514174339.1834871-9-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=902; i=ardb@kernel.org; h=from:subject; bh=B/kHgdOpjuIm/yGgjP0zTXGcP6XnGaz+vciWyr3djVs=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIUPlWkj9BO3u3gnr2ypE5E2uvsxuvTddxnHDnQ7TowlXD uj/FmPqKGVhEONgkBVTZBGY/ffdztMTpWqdZ8nCzGFlAhnCwMUpABOZo83wT9ddzsGtYhv3rz/7 NOWs9zVYcR/I3iEhJNXOMquLS2aWN8P/rHDfI4ztPNuVmsOTZFLuFfz8f7KhK/XA42jhh4384g+ ZAQ== X-Mailer: git-send-email 2.49.0.1101.gccaa498523-goog Message-ID: <20250514174339.1834871-13-ardb+git@google.com> Subject: [RFC PATCH 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-20250514_104404_824967_7AFF4DD0 X-CRM114-Status: GOOD ( 13.16 ) 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 ae2ea0196030..47a8706e26b7 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1975,11 +1975,11 @@ 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: -- 2.49.0.1101.gccaa498523-goog