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Sat, 25 Apr 2026 21:30:47 -0700 (PDT) From: Dmitry Torokhov To: Luis Chamberlain , Russ Weight , Danilo Krummrich Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] firmware_loader: builtin: fail build on empty firmware Date: Sat, 25 Apr 2026 21:30:39 -0700 Message-ID: <20260426043041.649202-2-dmitry.torokhov@gmail.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog In-Reply-To: <20260426043041.649202-1-dmitry.torokhov@gmail.com> References: <20260426043041.649202-1-dmitry.torokhov@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit If an empty firmware file is supplied via CONFIG_EXTRA_FIRMWARE, the build currently succeeds but creates an empty section. While the firmware loader will not return such sections it is better to avoid adding them in the first place. Add a compile-time size check to the filechk_fwbin macro to abort the build early if a 0-size firmware is encountered. Signed-off-by: Dmitry Torokhov --- drivers/base/firmware_loader/builtin/Makefile | 32 +++++++++++-------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/drivers/base/firmware_loader/builtin/Makefile b/drivers/base/firmware_loader/builtin/Makefile index 6c067dedc01e..af5b1bbb31e4 100644 --- a/drivers/base/firmware_loader/builtin/Makefile +++ b/drivers/base/firmware_loader/builtin/Makefile @@ -16,20 +16,24 @@ ASM_ALIGN = $(if $(CONFIG_64BIT),3,2) PROGBITS = $(if $(CONFIG_ARM),%,@)progbits filechk_fwbin = \ - echo "/* Generated by $(src)/Makefile */" ;\ - echo " .section .rodata" ;\ - echo " .p2align 4" ;\ - echo "_fw_$(FWSTR)_bin:" ;\ - echo " .incbin \"$(fwdir)/$(FWNAME)\"" ;\ - echo "_fw_end:" ;\ - echo " .section .rodata.str,\"aMS\",$(PROGBITS),1" ;\ - echo " .p2align $(ASM_ALIGN)" ;\ - echo "_fw_$(FWSTR)_name:" ;\ - echo " .string \"$(FWNAME)\"" ;\ - echo " .section .builtin_fw,\"a\",$(PROGBITS)" ;\ - echo " .p2align $(ASM_ALIGN)" ;\ - echo " $(ASM_WORD) _fw_$(FWSTR)_name" ;\ - echo " $(ASM_WORD) _fw_$(FWSTR)_bin" ;\ + if [ ! -s "$(fwdir)/$(FWNAME)" ]; then \ + echo "error: empty firmware: $(fwdir)/$(FWNAME)" >&2 ;\ + exit ;\ + fi ;\ + echo "/* Generated by $(src)/Makefile */" ;\ + echo " .section .rodata" ;\ + echo " .p2align 4" ;\ + echo "_fw_$(FWSTR)_bin:" ;\ + echo " .incbin \"$(fwdir)/$(FWNAME)\"" ;\ + echo "_fw_end:" ;\ + echo " .section .rodata.str,\"aMS\",$(PROGBITS),1" ;\ + echo " .p2align $(ASM_ALIGN)" ;\ + echo "_fw_$(FWSTR)_name:" ;\ + echo " .string \"$(FWNAME)\"" ;\ + echo " .section .builtin_fw,\"a\",$(PROGBITS)" ;\ + echo " .p2align $(ASM_ALIGN)" ;\ + echo " $(ASM_WORD) _fw_$(FWSTR)_name" ;\ + echo " $(ASM_WORD) _fw_$(FWSTR)_bin" ;\ echo " $(ASM_WORD) _fw_end - _fw_$(FWSTR)_bin" $(obj)/%.gen.S: FORCE -- 2.54.0.545.g6539524ca2-goog