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powerpc/32: Fix boot failure with GCC latent entropy plugin
authorChristophe Leroy <christophe.leroy@csgroup.eu>
Wed, 22 Dec 2021 13:07:31 +0000 (13:07 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 8 Feb 2022 17:15:27 +0000 (18:15 +0100)
commit bba496656a73fc1d1330b49c7f82843836e9feb1 upstream.

Boot fails with GCC latent entropy plugin enabled.

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

Fixes: 38addce8b600 ("gcc-plugins: Add latent_entropy plugin")
Cc: stable@vger.kernel.org # v4.9+
Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215217
Link: https://lore.kernel.org/r/2bac55483b8daf5b1caa163a45fa5f9cdbe18be4.1640178426.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/powerpc/kernel/Makefile patch | blob | blame | history
arch/powerpc/lib/Makefile patch | blob | blame | history

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index d80fbf0884ffafe48b251c649c725608ff544342..bc6c85788b84f980c925a0d9ab1b4eed2bdcabc6 100644 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -14,6 +14,7 @@ CFLAGS_prom_init.o      += -fPIC
 CFLAGS_btext.o         += -fPIC
 endif
 
+CFLAGS_setup_32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
 CFLAGS_cputable.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
 CFLAGS_prom_init.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
 CFLAGS_btext.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 309361e8652331b65e9bc2d28b870f9791b6d986..3e3370d126aea4f4951fc0c97f1e422b11987630 100644 (file)
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -9,6 +9,9 @@ ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
 CFLAGS_REMOVE_code-patching.o = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_feature-fixups.o = $(CC_FLAGS_FTRACE)
 
+CFLAGS_code-patching.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
+CFLAGS_feature-fixups.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
+
 obj-y += string.o alloc.o crtsavres.o code-patching.o \
         feature-fixups.o