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Wed, 22 Dec 2021 13:07:31 +0000 Received: from MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM ([fe80::f0ef:856d:b0de:e85d]) by MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM ([fe80::f0ef:856d:b0de:e85d%7]) with mapi id 15.20.4823.018; Wed, 22 Dec 2021 13:07:31 +0000 From: Christophe Leroy To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Subject: [PATCH] powerpc/32: Fix boot failure with GCC latent entropy plugin Thread-Topic: [PATCH] powerpc/32: Fix boot failure with GCC latent entropy plugin Thread-Index: AQHX9zTg0ZucU0S3NkiOSQU+B0LkiQ== Date: Wed, 22 Dec 2021 13:07:31 +0000 Message-ID: <2bac55483b8daf5b1caa163a45fa5f9cdbe18be4.1640178426.git.christophe.leroy@csgroup.eu> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=csgroup.eu; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2cff732f-717c-40ce-b0e7-08d9c54c0343 x-ms-traffictypediagnostic: MR1P264MB2691:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6108; 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This is due to early boot functions trying to access 'latent_entropy' global data while the kernel is not relocated at its final destination yet. As there is no way to tell GCC to use PTRRELOC() to access it, disable latent entropy plugin in early_32.o and feature-fixups.o and code-patching.o Reported-by: Erhard Furtner Link: https://bugzilla.kernel.org/show_bug.cgi?id=215217 Signed-off-by: Christophe Leroy Fixes: 38addce8b600 ("gcc-plugins: Add latent_entropy plugin") Cc: stable@vger.kernel.org Cc: Emese Revfy --- arch/powerpc/kernel/Makefile | 1 + arch/powerpc/lib/Makefile | 3 +++ 2 files changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 5fa68c2ef1f8..36f3f5a8868d 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -11,6 +11,7 @@ CFLAGS_prom_init.o += -fPIC CFLAGS_btext.o += -fPIC endif +CFLAGS_early_32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) CFLAGS_cputable.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) CFLAGS_prom_init.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) CFLAGS_btext.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index 9e5d0f413b71..0b08e85d3839 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -19,6 +19,9 @@ CFLAGS_code-patching.o += -DDISABLE_BRANCH_PROFILING CFLAGS_feature-fixups.o += -DDISABLE_BRANCH_PROFILING endif +CFLAGS_code-patching.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) +CFLAGS_feature-fixups.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) + obj-y += alloc.o code-patching.o feature-fixups.o pmem.o test_code-patching.o ifndef CONFIG_KASAN