From: Nicholas Piggin <npiggin@gmail•com>
To: linuxppc-dev@lists•ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail•com>
Subject: [PATCH 1/2] powerpc/64s: Fix GENERIC_CPU build flags for PPC970 / G5
Date: Wed, 21 Sep 2022 11:41:02 +1000 [thread overview]
Message-ID: <20220921014103.587954-1-npiggin@gmail.com> (raw)
Big-endian GENERIC_CPU supports 970, but builds with -mcpu=power5.
POWER5 is ISA v2.02 whereas 970 is v2.01 plus Altivec. 2.02 added
the popcntb instruction which a compiler might use.
Use -mcpu=power4.
Fixes: 471d7ff8b51b ("powerpc/64s: Remove POWER4 support")
Signed-off-by: Nicholas Piggin <npiggin@gmail•com>
---
arch/powerpc/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 02742facf895..140a5e6471fe 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -152,7 +152,7 @@ CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
else
CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
-CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
+CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power4
endif
else ifdef CONFIG_PPC_BOOK3E_64
CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
--
2.37.2
next reply other threads:[~2022-09-21 1:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-21 1:41 Nicholas Piggin [this message]
2022-09-21 1:41 ` [PATCH 2/2] powerpc/64s: update cpu selection options Nicholas Piggin
2022-09-21 19:03 ` Segher Boessenkool
2022-09-21 16:45 ` [PATCH 1/2] powerpc/64s: Fix GENERIC_CPU build flags for PPC970 / G5 Christophe Leroy
2022-09-21 18:50 ` Segher Boessenkool
2022-09-23 7:17 ` Nicholas Piggin
2022-09-23 12:22 ` Segher Boessenkool
2022-10-04 13:24 ` Michael Ellerman
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