From nobody Fri Oct 31 23:15:43 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 91B8A1C6A3; Fri, 17 Oct 2025 17:33:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760722439; cv=none; b=IZaxvWXwRhn9aeRW0n263wNSOoQ2N5wqHbBw9gSBN3DxKMkBLeqm5Cg5l3IR5AlkQ09dkgVZhxDERwf2U+yad8YVxUGOD9BdqAem801VyZFQp/uxGiNpCeYdosfb2ebsVJ//FYAcY+y5Oagi7ahfY//wtozmya2JWu9OLw8AHm0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760722439; c=relaxed/simple; bh=+AtrBZZs/qIkDn+qTjTtCY5vfEV341Ish4teGAyteog=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AXIAOrjmmkGsohu3bm0808dxejB0eYxFazN5vif4Ho2h1w0KuEfy2H0B8zBDSOay7Z0UWW3kKguLQJ1cVT1l+qOE6F/7pF1b+zmd+bry/dEiuP4xOs/nyExQvjKn8nL6u9FKMQTW5reJNtpVL+4hQQUw+Xf93WR5mi+isKOKlbU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OPgP6gif; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OPgP6gif" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A862C116B1; Fri, 17 Oct 2025 17:33:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760722439; bh=+AtrBZZs/qIkDn+qTjTtCY5vfEV341Ish4teGAyteog=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OPgP6gifmek7PvNRAp6QYqMZpMuvHUIcOFrLV8RQEHsjK4A20whrYv/o6pnZBlgxU I6GNRwdO4qTRXeWcOpCDII6kqrhQgvgHKaItBtU4KLao65t1KYz27nbobMfCLTHKOV dvbzHRc/k8ekapMMwEQmYQdGWIrQ0qWyINV3sRZeDa9xUnKzgJrvf8Jp/gWu1CMtwx I4EDwUHC9A+UqcX9+pF7EiOSUcasCow50eHFolYPkOFkoRMl5HxDlbCG97Ra0+CX+X SAOLnVeAJBhOmX28EaEEoCjgupuAYU8+nAg9EkEftJdkWFyXBKo5DtNaJRs3UUYqdo +pyCLiTGEPodg== From: "Matthieu Baerts (NGI0)" Date: Fri, 17 Oct 2025 19:33:40 +0200 Subject: [PATCH 5.4.y 3/5] x86/boot: Compile boot code with -std=gnu11 too Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251017-v5-4-gcc-15-v1-3-6d6367ee50a1@kernel.org> References: <20251017-v5-4-gcc-15-v1-0-6d6367ee50a1@kernel.org> In-Reply-To: <20251017-v5-4-gcc-15-v1-0-6d6367ee50a1@kernel.org> To: stable@vger.kernel.org, Greg Kroah-Hartman , Sasha Levin Cc: MPTCP Upstream , "Matthieu Baerts (NGI0)" , Alexey Dobriyan , Ingo Molnar , "H. Peter Anvin (Intel)" , Nathan Chancellor , Dave Hansen , Ard Biesheuvel X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3092; i=matttbe@kernel.org; h=from:subject:message-id; bh=5YeFtji4y5HM3kRjIcpX2gQzUdq9XBx5bFFcsgr3U+E=; b=owGbwMvMwCVWo/Th0Gd3rumMp9WSGDI+1f6eZLswUyGt/orm7pU111m4/gndX14+T4ErvHju+ c9VLE5GHaUsDGJcDLJiiizSbZH5M59X8ZZ4+VnAzGFlAhnCwMUpABexZmSYw7TqlfLVWcJ9alFn hW4mHpVaWzLze1JgcO0jm9e1bxObGP7nz998w3GbM8ukFdy2CqWygW8Ubu60OS+7qX75+7hrARX sAA== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Alexey Dobriyan commit b3bee1e7c3f2b1b77182302c7b2131c804175870 upstream. Use -std=3Dgnu11 for consistency with main kernel code. It doesn't seem to change anything in vmlinux. Signed-off-by: Alexey Dobriyan Signed-off-by: Ingo Molnar Acked-by: H. Peter Anvin (Intel) Link: https://lore.kernel.org/r/2058761e-12a4-4b2f-9690-3c3c1c9902a5@p183 [ This kernel version doesn't build with GCC 15: In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from arch/x86/realmode/rm/wakeup.h:11, from arch/x86/realmode/rm/wakemain.c:2: include/linux/stddef.h:11:9: error: cannot use keyword 'false' as enume= ration constant 11 | false =3D 0, | ^~~~~ include/linux/stddef.h:11:9: note: 'false' is a keyword with '-std=3Dc2= 3' onwards include/linux/types.h:30:33: error: 'bool' cannot be defined via 'typed= ef' 30 | typedef _Bool bool; | ^~~~ include/linux/types.h:30:33: note: 'bool' is a keyword with '-std=3Dc23= ' onwards include/linux/types.h:30:1: warning: useless type name in empty declara= tion 30 | typedef _Bool bool; | ^~~~~~~ The fix is similar to commit ee2ab467bddf ("x86/boot: Use '-std=3Dgnu11' to fix build with GCC 15") which has been backported to this kernel. Note: In < 5.18 version, -std=3Dgnu89 is used instead of -std=3Dgnu11, see commit e8c07082a810 ("Kbuild: move to -std=3Dgnu11"). I suggest not to modify that in this commit here as all the other similar fixes to support GCC 15 set -std=3Dgnu11. This can be done in a dedicated commit if needed. There was a conflict, because commit 2838307b019d ("x86/build: Remove -m16 workaround for unsupported versions of GCC") and commit accb8cfd506d ("x86/realmode: build with -D__DISABLE_EXPORTS") are not in this version and change code in the context. -std=3Dgnu11 can still be added at the same place. ] Signed-off-by: Matthieu Baerts (NGI0) --- Cc: Nathan Chancellor Cc: Dave Hansen Cc: Ard Biesheuvel --- arch/x86/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 69f0cb01c666..69930ed5574b 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -31,7 +31,7 @@ endif CODE16GCC_CFLAGS :=3D -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h M16_CFLAGS :=3D $(call cc-option, -m16, $(CODE16GCC_CFLAGS)) =20 -REALMODE_CFLAGS :=3D $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \ +REALMODE_CFLAGS :=3D -std=3Dgnu11 $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PR= OFILING \ -Wall -Wstrict-prototypes -march=3Di386 -mregparm=3D3 \ -fno-strict-aliasing -fomit-frame-pointer -fno-pic \ -mno-mmx -mno-sse $(call cc-option,-fcf-protection=3Dnone) --=20 2.51.0