This is a note to let you know that I've just added the patch titled
powerpc/32: Fix boot failure with GCC latent entropy plugin
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-32-fix-boot-failure-with-gcc-latent-entropy-plugin.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bba496656a73fc1d1330b49c7f82843836e9feb1 Mon Sep 17 00:00:00 2001
From: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Date: Wed, 22 Dec 2021 13:07:31 +0000
Subject: powerpc/32: Fix boot failure with GCC latent entropy plugin
From: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx # v4.9+
Reported-by: Erhard Furtner <erhard_f@xxxxxxxxxxx>
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215217
Link: https://lore.kernel.org/r/2bac55483b8daf5b1caa163a45fa5f9cdbe18be4.1640178426.git.christophe.leroy@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/Makefile | 1 +
arch/powerpc/lib/Makefile | 3 +++
2 files changed, 4 insertions(+)
--- 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)
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -19,6 +19,9 @@ CFLAGS_code-patching.o += -DDISABLE_BRAN
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
Patches currently in stable-queue which might be from christophe.leroy@xxxxxxxxxx are
queue-5.16/powerpc-32s-allocate-one-256k-ibat-instead-of-two-consecutives-128k-ibats.patch
queue-5.16/powerpc-audit-fix-syscall_get_arch.patch
queue-5.16/powerpc-32s-fix-kasan_init_region-for-kasan.patch
queue-5.16/powerpc-32-fix-boot-failure-with-gcc-latent-entropy-plugin.patch
