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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4406d5a9e38sm164703545e9.2.2025.04.21.23.43.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Apr 2025 23:43:11 -0700 (PDT) Message-ID: Date: Tue, 22 Apr 2025 08:43:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 11/20] util/cacheflush.c: Update cache flushing mechanism for Emscripten To: Kohei Tokunaga , qemu-devel@nongnu.org Cc: =?UTF-8?Q?Alex_Benn=C3=A9e?= , Thomas Huth , Kevin Wolf , Hanna Reitz , Paolo Bonzini , Alexandre Iooss , Mahmoud Mandour , Pierrick Bouvier , Pavel Pisa , Francisco Iglesias , Vikram Garhwal , Jason Wang , =?UTF-8?Q?Marc-Andr=C3=A9_Lureau?= , =?UTF-8?Q?Daniel_P_=2E_Berrang=C3=A9?= , Eduardo Habkost , Peter Xu , David Hildenbrand , Peter Maydell , Zhao Liu , Nicholas Piggin , Daniel Henrique Barboza , Richard Henderson , Ilya Leoshkevich , Stefan Hajnoczi , qemu-block@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnu.org, qemu-s390x@nongnu.org References: <73301cc216217d5c3e0d7acdd32482e36f4f045c.1745295397.git.ktokunaga.mail@gmail.com> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <73301cc216217d5c3e0d7acdd32482e36f4f045c.1745295397.git.ktokunaga.mail@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::434; envelope-from=philmd@linaro.org; helo=mail-wr1-x434.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 22/4/25 07:27, Kohei Tokunaga wrote: > Although __builtin___clear_cache is used to flush the instruction cache for > a specified memory region[1], this operation doesn't apply to wasm, as its > memory isn't executable. Moreover, Emscripten does not support this builtin > and fails to compile it with the following error. > >> fatal error: error in backend: llvm.clear_cache is not supported on wasm > > To resolve this, this commit removes the call to __builtin___clear_cache for > Emscripten build. > > [1] https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005f_005f_005fclear_005fcache > > Signed-off-by: Kohei Tokunaga > --- > include/qemu/cacheflush.h | 7 +++++++ > util/cacheflush.c | 4 ++++ > 2 files changed, 11 insertions(+) Reviewed-by: Philippe Mathieu-Daudé