[PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

[PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

[Christophe Leroy]

Commit 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
enlarged the CPU selection logic to PPC32 by removing depend to
PPC64, and failed to restrict that depend to E5500_CPU and E6500_CPU.
Fortunately that got unnoticed because -mcpu=8540 will override the
-mcpu=e500mc64 or -mpcu=e6500 as they are ealier, but that's
fragile and may no be right in the future.

Add back the depend PPC64 on E5500_CPU and E6500_CPU.

Fixes: 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/platforms/Kconfig.cputype | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 383ed4fe6013..9805a2c717b9 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -173,11 +173,11 @@ config POWER9_CPU
 
 config E5500_CPU
 	bool "Freescale e5500"
-	depends on E500
+	depends on PPC64 && E500
 
 config E6500_CPU
 	bool "Freescale e6500"
-	depends on E500
+	depends on PPC64 && E500
 
 config 860_CPU
 	bool "8xx family"
-- 
2.36.1

[PATCH v1 2/5] powerpc/32: Don't always pass -mcpu=powerpc to the compiler

[Christophe Leroy]

Since commit 4bf4f42a2feb ("powerpc/kbuild: Set default generic
machine type for 32-bit compile"), when building a 32 bits kernel
with a bi-arch version of GCC, or when building a book3s/32 kernel,
the option -mcpu=powerpc is passed to GCC at all time, relying on it
being eventually overriden by a subsequent -mcpu=xxxx.

But when building the same kernel with a 32 bits only version of GCC,
that is not done, relying on gcc being built with the expected default
CPU.

This logic has two problems. First, it is a bit fragile to rely on
whether the GCC version is bi-arch or not, because today we can have
bi-arch versions of GCC configured with a 32 bits default. Second,
there are some versions of GCC which don't support -mcpu=powerpc,
for instance for e500 SPE-only versions.

So, stop relying on this approximative logic and allow the user to
decide whether he/she wants to use the toolchain's default CPU or if
he/she wants to set one, and allow only possible CPUs based on the
selected target.

Reported-by: Pali Rohár <pali@kernel.org>
Tested-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/Makefile                  | 26 +-------------------------
 arch/powerpc/platforms/Kconfig.cputype | 21 ++++++++++++++++++---
 2 files changed, 19 insertions(+), 28 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index a0cd70712061..d54e1fe03551 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -15,23 +15,6 @@ HAS_BIARCH	:= $(call cc-option-yn, -m32)
 # Set default 32 bits cross compilers for vdso and boot wrapper
 CROSS32_COMPILE ?=
 
-ifeq ($(HAS_BIARCH),y)
-ifeq ($(CROSS32_COMPILE),)
-ifdef CONFIG_PPC32
-# These options will be overridden by any -mcpu option that the CPU
-# or platform code sets later on the command line, but they are needed
-# to set a sane 32-bit cpu target for the 64-bit cross compiler which
-# may default to the wrong ISA.
-KBUILD_CFLAGS		+= -mcpu=powerpc
-KBUILD_AFLAGS		+= -mcpu=powerpc
-endif
-endif
-endif
-
-ifdef CONFIG_PPC_BOOK3S_32
-KBUILD_CFLAGS		+= -mcpu=powerpc
-endif
-
 # If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
 # ppc64_defconfig because we have nothing better to go on.
 uname := $(shell uname -m)
@@ -183,6 +166,7 @@ endif
 endif
 
 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
+AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
 
 # Altivec option not allowed with e500mc64 in GCC.
 ifdef CONFIG_ALTIVEC
@@ -193,14 +177,6 @@ endif
 CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
 
-ifdef CONFIG_PPC32
-ifdef CONFIG_PPC_E500MC
-CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
-else
-CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
-endif
-endif
-
 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
 
 KBUILD_CPPFLAGS	+= -I $(srctree)/arch/$(ARCH) $(asinstr)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 9805a2c717b9..bfea5d8452f8 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -135,9 +135,9 @@ config GENERIC_CPU
 	select ARCH_HAS_FAST_MULTIPLIER
 	select PPC_64S_HASH_MMU
 
-config GENERIC_CPU
+config POWERPC_CPU
 	bool "Generic 32 bits powerpc"
-	depends on PPC32 && !PPC_8xx
+	depends on PPC32 && !PPC_8xx && !PPC_85xx
 
 config CELL_CPU
 	bool "Cell Broadband Engine"
@@ -196,11 +196,23 @@ config G4_CPU
 	depends on PPC_BOOK3S_32
 	select ALTIVEC
 
+config E500_CPU
+	bool "e500 (8540)"
+	depends on PPC_85xx && !PPC_E500MC
+
+config E500MC_CPU
+	bool "e500mc"
+	depends on PPC_85xx && PPC_E500MC
+
+config TOOLCHAIN_DEFAULT_CPU
+	bool "Rely on the toolchain's implicit default CPU"
+	depends on PPC32
+
 endchoice
 
 config TARGET_CPU_BOOL
 	bool
-	default !GENERIC_CPU
+	default !GENERIC_CPU && !TOOLCHAIN_DEFAULT_CPU
 
 config TARGET_CPU
 	string
@@ -215,6 +227,9 @@ config TARGET_CPU
 	default "e300c2" if E300C2_CPU
 	default "e300c3" if E300C3_CPU
 	default "G4" if G4_CPU
+	default "8540" if E500_CPU
+	default "e500mc" if E500MC_CPU
+	default "powerpc" if POWERPC_CPU
 
 config PPC_BOOK3S
 	def_bool y
-- 
2.36.1

Re: [PATCH v1 2/5] powerpc/32: Don't always pass -mcpu=powerpc to the compiler

[Segher Boessenkool]

On Mon, Jul 11, 2022 at 04:19:30PM +0200, Christophe Leroy wrote:
> Since commit 4bf4f42a2feb ("powerpc/kbuild: Set default generic
> machine type for 32-bit compile"), when building a 32 bits kernel
> with a bi-arch version of GCC, or when building a book3s/32 kernel,
> the option -mcpu=powerpc is passed to GCC at all time, relying on it
> being eventually overriden by a subsequent -mcpu=xxxx.
> 
> But when building the same kernel with a 32 bits only version of GCC,
> that is not done, relying on gcc being built with the expected default
> CPU.
> 
> This logic has two problems. First, it is a bit fragile to rely on
> whether the GCC version is bi-arch or not, because today we can have
> bi-arch versions of GCC configured with a 32 bits default. Second,
> there are some versions of GCC which don't support -mcpu=powerpc,
> for instance for e500 SPE-only versions.

More fundamentally, the *only* thing you should check biarch for is
for determining if you can use both -m32 and -m64 with the same
compiler.  Everything behaves identically in a biarch and a non-biarch
compiler, other than the latter screams bloody murder if you try to
change the architecture from 32 to 64 bit or vice versa.

> So, stop relying on this approximative logic and allow the user to
> decide whether he/she wants to use the toolchain's default CPU or if
> he/she wants to set one, and allow only possible CPUs based on the
> selected target.
> 
> Reported-by: Pali Rohár <pali@kernel.org>
> Tested-by: Pali Rohár <pali@kernel.org>
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Cc: Segher Boessenkool <segher@kernel.crashing.org>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>

Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>

Looks good to me.  This untangles/demystifies quite some code :-)


Segher

Re: [PATCH v1 2/5] powerpc/32: Don't always pass -mcpu=powerpc to the compiler

[Pali Rohár]

On Monday 11 July 2022 16:19:30 Christophe Leroy wrote:
> Since commit 4bf4f42a2feb ("powerpc/kbuild: Set default generic
> machine type for 32-bit compile"), when building a 32 bits kernel
> with a bi-arch version of GCC, or when building a book3s/32 kernel,
> the option -mcpu=powerpc is passed to GCC at all time, relying on it
> being eventually overriden by a subsequent -mcpu=xxxx.
> 
> But when building the same kernel with a 32 bits only version of GCC,
> that is not done, relying on gcc being built with the expected default
> CPU.
> 
> This logic has two problems. First, it is a bit fragile to rely on
> whether the GCC version is bi-arch or not, because today we can have
> bi-arch versions of GCC configured with a 32 bits default. Second,
> there are some versions of GCC which don't support -mcpu=powerpc,
> for instance for e500 SPE-only versions.
> 
> So, stop relying on this approximative logic and allow the user to
> decide whether he/she wants to use the toolchain's default CPU or if
> he/she wants to set one, and allow only possible CPUs based on the
> selected target.

Hello! Exactly same issue is still in file arch/powerpc/boot/Makefile:

  ifdef CONFIG_PPC64_BOOT_WRAPPER
  ifdef CONFIG_CPU_LITTLE_ENDIAN
  BOOTCFLAGS	+= -m64 -mcpu=powerpc64le
  else
  BOOTCFLAGS	+= -m64 -mcpu=powerpc64
  endif
  else
  BOOTCFLAGS	+= -m32 -mcpu=powerpc
  endif

It cause compile error:

  make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnuspe- mpc85xx_smp_defconfig uImage
  ...
    BOOTAS  arch/powerpc/boot/crt0.o
  powerpc-linux-gnuspe-gcc: error: unrecognized argument in option ‘-mcpu=powerpc’
  powerpc-linux-gnuspe-gcc: note: valid arguments to ‘-mcpu=’ are: 8540 8548 native
  make[1]: *** [arch/powerpc/boot/Makefile:231: arch/powerpc/boot/crt0.o] Error 1

> Reported-by: Pali Rohár <pali@kernel.org>
> Tested-by: Pali Rohár <pali@kernel.org>
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Cc: Segher Boessenkool <segher@kernel.crashing.org>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
>  arch/powerpc/Makefile                  | 26 +-------------------------
>  arch/powerpc/platforms/Kconfig.cputype | 21 ++++++++++++++++++---
>  2 files changed, 19 insertions(+), 28 deletions(-)

Re: [PATCH v1 2/5] powerpc/32: Don't always pass -mcpu=powerpc to the compiler

[Pali Rohár]

On Thursday 18 August 2022 19:46:34 Pali Rohár wrote:
> On Monday 11 July 2022 16:19:30 Christophe Leroy wrote:
> > Since commit 4bf4f42a2feb ("powerpc/kbuild: Set default generic
> > machine type for 32-bit compile"), when building a 32 bits kernel
> > with a bi-arch version of GCC, or when building a book3s/32 kernel,
> > the option -mcpu=powerpc is passed to GCC at all time, relying on it
> > being eventually overriden by a subsequent -mcpu=xxxx.
> > 
> > But when building the same kernel with a 32 bits only version of GCC,
> > that is not done, relying on gcc being built with the expected default
> > CPU.
> > 
> > This logic has two problems. First, it is a bit fragile to rely on
> > whether the GCC version is bi-arch or not, because today we can have
> > bi-arch versions of GCC configured with a 32 bits default. Second,
> > there are some versions of GCC which don't support -mcpu=powerpc,
> > for instance for e500 SPE-only versions.
> > 
> > So, stop relying on this approximative logic and allow the user to
> > decide whether he/she wants to use the toolchain's default CPU or if
> > he/she wants to set one, and allow only possible CPUs based on the
> > selected target.
> 
> Hello! Exactly same issue is still in file arch/powerpc/boot/Makefile:
> 
>   ifdef CONFIG_PPC64_BOOT_WRAPPER
>   ifdef CONFIG_CPU_LITTLE_ENDIAN
>   BOOTCFLAGS	+= -m64 -mcpu=powerpc64le
>   else
>   BOOTCFLAGS	+= -m64 -mcpu=powerpc64
>   endif
>   else
>   BOOTCFLAGS	+= -m32 -mcpu=powerpc
>   endif
> 
> It cause compile error:
> 
>   make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnuspe- mpc85xx_smp_defconfig uImage
>   ...
>     BOOTAS  arch/powerpc/boot/crt0.o
>   powerpc-linux-gnuspe-gcc: error: unrecognized argument in option ‘-mcpu=powerpc’
>   powerpc-linux-gnuspe-gcc: note: valid arguments to ‘-mcpu=’ are: 8540 8548 native
>   make[1]: *** [arch/powerpc/boot/Makefile:231: arch/powerpc/boot/crt0.o] Error 1

Now I have sent patch for this issue:
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20220820105200.30425-1-pali@kernel.org/

> > Reported-by: Pali Rohár <pali@kernel.org>
> > Tested-by: Pali Rohár <pali@kernel.org>
> > Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> > Cc: Segher Boessenkool <segher@kernel.crashing.org>
> > Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> > ---
> >  arch/powerpc/Makefile                  | 26 +-------------------------
> >  arch/powerpc/platforms/Kconfig.cputype | 21 ++++++++++++++++++---
> >  2 files changed, 19 insertions(+), 28 deletions(-)

[PATCH v1 3/5] powerpc/405: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Christophe Leroy]

Building ppc40x_defconfig leads to following error

  CC      arch/powerpc/kernel/process.o
{standard input}: Assembler messages:
{standard input}:626: Error: unrecognized opcode: `wrteei'

Add -mcpu=405 by default.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/platforms/Kconfig.cputype | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index bfea5d8452f8..e14000557ebd 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -137,7 +137,7 @@ config GENERIC_CPU
 
 config POWERPC_CPU
 	bool "Generic 32 bits powerpc"
-	depends on PPC32 && !PPC_8xx && !PPC_85xx
+	depends on PPC32 && !PPC_8xx && !PPC_85xx && !40x
 
 config CELL_CPU
 	bool "Cell Broadband Engine"
@@ -179,6 +179,10 @@ config E6500_CPU
 	bool "Freescale e6500"
 	depends on PPC64 && E500
 
+config 405_CPU
+	bool "40x family"
+	depends on 40x
+
 config 860_CPU
 	bool "8xx family"
 	depends on PPC_8xx
@@ -223,6 +227,7 @@ config TARGET_CPU
 	default "power7" if POWER7_CPU
 	default "power8" if POWER8_CPU
 	default "power9" if POWER9_CPU
+	default "405" if 405_CPU
 	default "860" if 860_CPU
 	default "e300c2" if E300C2_CPU
 	default "e300c3" if E300C3_CPU
-- 
2.36.1

[PATCH v1 4/5] powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Christophe Leroy]

Building ppc40x_defconfig leads to following error

  CC      arch/powerpc/kernel/idle.o
{standard input}: Assembler messages:
{standard input}:67: Error: unrecognized opcode: `wrteei'
{standard input}:78: Error: unrecognized opcode: `wrteei'

Add -mcpu=440 by default and alternatively 464 and 476.

Once that's done, -mcpu=powerpc is only for book3s/32 now.

But then comes

  CC      arch/powerpc/kernel/io.o
{standard input}: Assembler messages:
{standard input}:198: Error: unrecognized opcode: `eieio'
{standard input}:230: Error: unrecognized opcode: `eieio'
{standard input}:245: Error: unrecognized opcode: `eieio'
{standard input}:254: Error: unrecognized opcode: `eieio'
{standard input}:273: Error: unrecognized opcode: `eieio'
{standard input}:396: Error: unrecognized opcode: `eieio'
{standard input}:404: Error: unrecognized opcode: `eieio'
{standard input}:423: Error: unrecognized opcode: `eieio'
{standard input}:512: Error: unrecognized opcode: `eieio'
{standard input}:520: Error: unrecognized opcode: `eieio'
{standard input}:539: Error: unrecognized opcode: `eieio'
{standard input}:628: Error: unrecognized opcode: `eieio'
{standard input}:636: Error: unrecognized opcode: `eieio'
{standard input}:655: Error: unrecognized opcode: `eieio'

Fix it by replacing eieio by mbar on booke.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/include/asm/barrier.h        |  2 ++
 arch/powerpc/include/asm/nohash/pgtable.h |  2 +-
 arch/powerpc/include/asm/synch.h          |  5 ++++-
 arch/powerpc/mm/nohash/tlb_low.S          |  4 ++--
 arch/powerpc/platforms/Kconfig.cputype    | 17 ++++++++++++++++-
 arch/powerpc/sysdev/fsl_rio.c             | 12 ++++++++++--
 6 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
index f0e687236484..ef2d8b15eaab 100644
--- a/arch/powerpc/include/asm/barrier.h
+++ b/arch/powerpc/include/asm/barrier.h
@@ -42,6 +42,8 @@
 /* The sub-arch has lwsync */
 #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_E500MC)
 #    define SMPWMB      LWSYNC
+#elif defined(CONFIG_BOOKE)
+#    define SMPWMB      mbar
 #else
 #    define SMPWMB      eieio
 #endif
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index ac75f4ab0dba..b499da6c1a99 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -193,7 +193,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 	if (IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_PTE_64BIT) && !percpu) {
 		__asm__ __volatile__("\
 			stw%X0 %2,%0\n\
-			eieio\n\
+			mbar\n\
 			stw%X1 %L2,%1"
 		: "=m" (*ptep), "=m" (*((unsigned char *)ptep+4))
 		: "r" (pte) : "memory");
diff --git a/arch/powerpc/include/asm/synch.h b/arch/powerpc/include/asm/synch.h
index 1d67bc8d7bc6..7130176d8cb8 100644
--- a/arch/powerpc/include/asm/synch.h
+++ b/arch/powerpc/include/asm/synch.h
@@ -14,7 +14,10 @@ extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
 
 static inline void eieio(void)
 {
-	__asm__ __volatile__ ("eieio" : : : "memory");
+	if (IS_ENABLED(CONFIG_BOOKE))
+		__asm__ __volatile__ ("mbar" : : : "memory");
+	else
+		__asm__ __volatile__ ("eieio" : : : "memory");
 }
 
 static inline void isync(void)
diff --git a/arch/powerpc/mm/nohash/tlb_low.S b/arch/powerpc/mm/nohash/tlb_low.S
index dd39074de9af..d62b613a0d5d 100644
--- a/arch/powerpc/mm/nohash/tlb_low.S
+++ b/arch/powerpc/mm/nohash/tlb_low.S
@@ -186,7 +186,7 @@ _GLOBAL(_tlbivax_bcast)
 	isync
 	PPC_TLBIVAX(0, R3)
 	isync
-	eieio
+	mbar
 	tlbsync
 BEGIN_FTR_SECTION
 	b	1f
@@ -355,7 +355,7 @@ _GLOBAL(_tlbivax_bcast)
 	rlwimi	r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
 1:	mtspr	SPRN_MAS6,r4		/* assume AS=0 for now */
 	PPC_TLBIVAX(0,R3)
-	eieio
+	mbar
 	tlbsync
 	sync
 	wrtee	r10
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index e14000557ebd..3cc8452b8660 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -137,7 +137,7 @@ config GENERIC_CPU
 
 config POWERPC_CPU
 	bool "Generic 32 bits powerpc"
-	depends on PPC32 && !PPC_8xx && !PPC_85xx && !40x
+	depends on PPC_BOOK3S_32
 
 config CELL_CPU
 	bool "Cell Broadband Engine"
@@ -183,6 +183,18 @@ config 405_CPU
 	bool "40x family"
 	depends on 40x
 
+config 440_CPU
+	bool "440 (44x family)"
+	depends on 44x
+
+config 464_CPU
+	bool "464 (44x family)"
+	depends on 44x
+
+config 476_CPU
+	bool "476 (47x family)"
+	depends on PPC_47x
+
 config 860_CPU
 	bool "8xx family"
 	depends on PPC_8xx
@@ -228,6 +240,9 @@ config TARGET_CPU
 	default "power8" if POWER8_CPU
 	default "power9" if POWER9_CPU
 	default "405" if 405_CPU
+	default "440" if 440_CPU
+	default "464" if 464_CPU
+	default "476" if 476_CPU
 	default "860" if 860_CPU
 	default "e300c2" if E300C2_CPU
 	default "e300c3" if E300C3_CPU
diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 1bfc9afa8a1a..4647c6074f3b 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -69,10 +69,10 @@
 
 static DEFINE_SPINLOCK(fsl_rio_config_lock);
 
-#define __fsl_read_rio_config(x, addr, err, op)		\
+#define ___fsl_read_rio_config(x, addr, err, op, barrier)	\
 	__asm__ __volatile__(				\
 		"1:	"op" %1,0(%2)\n"		\
-		"	eieio\n"			\
+		"	"barrier"\n"			\
 		"2:\n"					\
 		".section .fixup,\"ax\"\n"		\
 		"3:	li %1,-1\n"			\
@@ -83,6 +83,14 @@ static DEFINE_SPINLOCK(fsl_rio_config_lock);
 		: "=r" (err), "=r" (x)			\
 		: "b" (addr), "i" (-EFAULT), "0" (err))
 
+#ifdef CONFIG_BOOKE
+#define __fsl_read_rio_config(x, addr, err, op)	\
+	___fsl_read_rio_config(x, addr, err, op, "mbar")
+#else
+#define __fsl_read_rio_config(x, addr, err, op)	\
+	___fsl_read_rio_config(x, addr, err, op, "eieio")
+#endif
+
 void __iomem *rio_regs_win;
 void __iomem *rmu_regs_win;
 resource_size_t rio_law_start;
-- 
2.36.1

Re: [PATCH v1 4/5] powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Arnd Bergmann]

On Mon, Jul 11, 2022 at 4:19 PM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
> @@ -183,6 +183,18 @@ config 405_CPU
>         bool "40x family"
>         depends on 40x
>
> +config 440_CPU
> +       bool "440 (44x family)"
> +       depends on 44x
> +
> +config 464_CPU
> +       bool "464 (44x family)"
> +       depends on 44x
> +
> +config 476_CPU
> +       bool "476 (47x family)"
> +       depends on PPC_47x

Is there any value in building for -mcpu=440 or -mcpu=464 when targeting a 476?
Maybe add another !PPC_47x dependency for the first two. Ideally we would also
enforce that 440/464 based boards cannot be selected together with 476, though
I guess that is a separate issue.

Is there a practical difference between 440 and 464 when building kernels?
gcc seems to treat them the same way, so maybe one option for both is enough
here.

     Arnd

Re: [PATCH v1 4/5] powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Christophe Leroy]

Oops, I wanted to include Pali and Segher when I sent the series, I 
prepared a script including them but used the wrong script at the end.

Le 11/07/2022 à 17:05, Arnd Bergmann a écrit :
> On Mon, Jul 11, 2022 at 4:19 PM Christophe Leroy
> <christophe.leroy@csgroup.eu> wrote:
>> @@ -183,6 +183,18 @@ config 405_CPU
>>          bool "40x family"
>>          depends on 40x
>>
>> +config 440_CPU
>> +       bool "440 (44x family)"
>> +       depends on 44x
>> +
>> +config 464_CPU
>> +       bool "464 (44x family)"
>> +       depends on 44x
>> +
>> +config 476_CPU
>> +       bool "476 (47x family)"
>> +       depends on PPC_47x
> 
> Is there any value in building for -mcpu=440 or -mcpu=464 when targeting a 476?

No idea, maybe not.

> Maybe add another !PPC_47x dependency for the first two. Ideally we would also
> enforce that 440/464 based boards cannot be selected together with 476, though
> I guess that is a separate issue.

Yes can do that.

By the way, 440/464 boards get excluded from kernel/cputable.c when 47x 
is selected

> 
> Is there a practical difference between 440 and 464 when building kernels?
> gcc seems to treat them the same way, so maybe one option for both is enough
> here.
> 

I don't know.

Christophe

Re: [PATCH v1 4/5] powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Segher Boessenkool]

On Mon, Jul 11, 2022 at 05:05:04PM +0200, Arnd Bergmann wrote:
> Is there any value in building for -mcpu=440 or -mcpu=464 when targeting a 476?

The original 440 had a very short pipeline.  Later IBM 4xx have a longer
pipeline.  Getting this right (with -mtune=, or just with -mcpu=) is
important for performance.  So, no?

> Maybe add another !PPC_47x dependency for the first two. Ideally we would also
> enforce that 440/464 based boards cannot be selected together with 476, though
> I guess that is a separate issue.
> 
> Is there a practical difference between 440 and 464 when building kernels?
> gcc seems to treat them the same way, so maybe one option for both is enough
> here.

-mcpu= is used as the default for -mtune=, so that is always a
consideration.  PPC464 is treated the same as PPC440 in binutils as
well, so I don't think there is any issue there.


Segher

[PATCH v1 5/5] powerpc/64e: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Christophe Leroy]

With GCC 12, corenet64_smp_defconfig leads to the following build errors:

  CC      arch/powerpc/kernel/irq.o
{standard input}: Assembler messages:
{standard input}:3616: Error: unrecognized opcode: `wrteei'
{standard input}:5689: Error: unrecognized opcode: `wrteei'
  CC      arch/powerpc/kernel/pmc.o
{standard input}: Assembler messages:
{standard input}:42: Error: unrecognized opcode: `mfpmr'
{standard input}:53: Error: unrecognized opcode: `mtpmr'
  CC      arch/powerpc/kernel/io.o
{standard input}: Assembler messages:
{standard input}:376: Error: unrecognized opcode: `mbar'
...
  CC      arch/powerpc/mm/nohash/book3e_hugetlbpage.o
{standard input}: Assembler messages:
{standard input}:291: Error: unrecognized opcode: `tlbsx'
{standard input}:482: Error: unrecognized opcode: `tlbwe'
{standard input}:608: Error: unrecognized opcode: `lbarx'
{standard input}:608: Error: unrecognized opcode: `stbcx.'

-mpcu=powerpc64 cannot be used anymore for book3e, it must be a booke CPU.

But then we get:

  CC      arch/powerpc/lib/xor_vmx.o
cc1: error: AltiVec not supported in this target

Altivec is not supported with -mcpu=e5500 so don't allow selection
of altivec when e5500 is selected.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/Makefile                  | 8 +-------
 arch/powerpc/platforms/Kconfig.cputype | 8 ++++----
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index d54e1fe03551..02742facf895 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -168,13 +168,7 @@ endif
 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
 
-# Altivec option not allowed with e500mc64 in GCC.
-ifdef CONFIG_ALTIVEC
-E5500_CPU := -mcpu=powerpc64
-else
-E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
-endif
-CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
+CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
 
 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 3cc8452b8660..5185d942b455 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -126,12 +126,12 @@ choice
 
 config GENERIC_CPU
 	bool "Generic (POWER4 and above)"
-	depends on PPC64 && !CPU_LITTLE_ENDIAN
-	select PPC_64S_HASH_MMU if PPC_BOOK3S_64
+	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
+	select PPC_64S_HASH_MMU
 
 config GENERIC_CPU
 	bool "Generic (POWER8 and above)"
-	depends on PPC64 && CPU_LITTLE_ENDIAN
+	depends on PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
 	select ARCH_HAS_FAST_MULTIPLIER
 	select PPC_64S_HASH_MMU
 
@@ -358,7 +358,7 @@ config PHYS_64BIT
 
 config ALTIVEC
 	bool "AltiVec Support"
-	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64 || (PPC_E500MC && PPC64)
+	depends on PPC_BOOK3S || (PPC_E500MC && PPC64 && !E5500_CPU)
 	select PPC_FPU
 	help
 	  This option enables kernel support for the Altivec extensions to the
-- 
2.36.1

Re: [PATCH v1 5/5] powerpc/64e: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Pali Rohár]

On Monday 11 July 2022 16:19:33 Christophe Leroy wrote:
> With GCC 12, corenet64_smp_defconfig leads to the following build errors:
> 
>   CC      arch/powerpc/kernel/irq.o
> {standard input}: Assembler messages:
> {standard input}:3616: Error: unrecognized opcode: `wrteei'
> {standard input}:5689: Error: unrecognized opcode: `wrteei'
>   CC      arch/powerpc/kernel/pmc.o
> {standard input}: Assembler messages:
> {standard input}:42: Error: unrecognized opcode: `mfpmr'
> {standard input}:53: Error: unrecognized opcode: `mtpmr'
>   CC      arch/powerpc/kernel/io.o
> {standard input}: Assembler messages:
> {standard input}:376: Error: unrecognized opcode: `mbar'
> ...
>   CC      arch/powerpc/mm/nohash/book3e_hugetlbpage.o
> {standard input}: Assembler messages:
> {standard input}:291: Error: unrecognized opcode: `tlbsx'
> {standard input}:482: Error: unrecognized opcode: `tlbwe'
> {standard input}:608: Error: unrecognized opcode: `lbarx'
> {standard input}:608: Error: unrecognized opcode: `stbcx.'
> 
> -mpcu=powerpc64 cannot be used anymore for book3e, it must be a booke CPU.
> 
> But then we get:
> 
>   CC      arch/powerpc/lib/xor_vmx.o
> cc1: error: AltiVec not supported in this target
> 
> Altivec is not supported with -mcpu=e5500 so don't allow selection
> of altivec when e5500 is selected.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
>  arch/powerpc/Makefile                  | 8 +-------
>  arch/powerpc/platforms/Kconfig.cputype | 8 ++++----
>  2 files changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index d54e1fe03551..02742facf895 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -168,13 +168,7 @@ endif
>  CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>  AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>  
> -# Altivec option not allowed with e500mc64 in GCC.
> -ifdef CONFIG_ALTIVEC
> -E5500_CPU := -mcpu=powerpc64
> -else
> -E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
> -endif
> -CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
> +CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
>  CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))

Hello! I think that there is an issue. After removal of E5500_CPU
variable few line above, it cannot be used in CFLAGS-$(CONFIG_E6500_CPU)
assignment, because it is empty.

>  
>  asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index 3cc8452b8660..5185d942b455 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -126,12 +126,12 @@ choice
>  
>  config GENERIC_CPU
>  	bool "Generic (POWER4 and above)"
> -	depends on PPC64 && !CPU_LITTLE_ENDIAN
> -	select PPC_64S_HASH_MMU if PPC_BOOK3S_64
> +	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
> +	select PPC_64S_HASH_MMU
>  
>  config GENERIC_CPU
>  	bool "Generic (POWER8 and above)"
> -	depends on PPC64 && CPU_LITTLE_ENDIAN
> +	depends on PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
>  	select ARCH_HAS_FAST_MULTIPLIER
>  	select PPC_64S_HASH_MMU
>  
> @@ -358,7 +358,7 @@ config PHYS_64BIT
>  
>  config ALTIVEC
>  	bool "AltiVec Support"
> -	depends on PPC_BOOK3S_32 || PPC_BOOK3S_64 || (PPC_E500MC && PPC64)
> +	depends on PPC_BOOK3S || (PPC_E500MC && PPC64 && !E5500_CPU)
>  	select PPC_FPU
>  	help
>  	  This option enables kernel support for the Altivec extensions to the
> -- 
> 2.36.1
> 

Re: [PATCH v1 5/5] powerpc/64e: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Christophe Leroy]

Le 11/12/2022 à 18:32, Pali Rohár a écrit :
> On Monday 11 July 2022 16:19:33 Christophe Leroy wrote:
>> With GCC 12, corenet64_smp_defconfig leads to the following build errors:
>>
>>    CC      arch/powerpc/kernel/irq.o
>> {standard input}: Assembler messages:
>> {standard input}:3616: Error: unrecognized opcode: `wrteei'
>> {standard input}:5689: Error: unrecognized opcode: `wrteei'
>>    CC      arch/powerpc/kernel/pmc.o
>> {standard input}: Assembler messages:
>> {standard input}:42: Error: unrecognized opcode: `mfpmr'
>> {standard input}:53: Error: unrecognized opcode: `mtpmr'
>>    CC      arch/powerpc/kernel/io.o
>> {standard input}: Assembler messages:
>> {standard input}:376: Error: unrecognized opcode: `mbar'
>> ...
>>    CC      arch/powerpc/mm/nohash/book3e_hugetlbpage.o
>> {standard input}: Assembler messages:
>> {standard input}:291: Error: unrecognized opcode: `tlbsx'
>> {standard input}:482: Error: unrecognized opcode: `tlbwe'
>> {standard input}:608: Error: unrecognized opcode: `lbarx'
>> {standard input}:608: Error: unrecognized opcode: `stbcx.'
>>
>> -mpcu=powerpc64 cannot be used anymore for book3e, it must be a booke CPU.
>>
>> But then we get:
>>
>>    CC      arch/powerpc/lib/xor_vmx.o
>> cc1: error: AltiVec not supported in this target
>>
>> Altivec is not supported with -mcpu=e5500 so don't allow selection
>> of altivec when e5500 is selected.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>> ---
>>   arch/powerpc/Makefile                  | 8 +-------
>>   arch/powerpc/platforms/Kconfig.cputype | 8 ++++----
>>   2 files changed, 5 insertions(+), 11 deletions(-)
>>
>> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
>> index d54e1fe03551..02742facf895 100644
>> --- a/arch/powerpc/Makefile
>> +++ b/arch/powerpc/Makefile
>> @@ -168,13 +168,7 @@ endif
>>   CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>   AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>   
>> -# Altivec option not allowed with e500mc64 in GCC.
>> -ifdef CONFIG_ALTIVEC
>> -E5500_CPU := -mcpu=powerpc64
>> -else
>> -E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
>> -endif
>> -CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
>> +CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
>>   CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
> 
> Hello! I think that there is an issue. After removal of E5500_CPU
> variable few line above, it cannot be used in CFLAGS-$(CONFIG_E6500_CPU)
> assignment, because it is empty.
> 

Ah yes, you are right.

It should be fixed by 
https://github.com/linuxppc/linux/commit/f2636eaac7dee1d7d096cc115ff4f5111b0c508c

Michael, I see the patch is in next-test. Can you add:

Fixes: d6b551b8f90c ("powerpc/64e: Fix build failure with GCC 12 
(unrecognized opcode: `wrteei')")


Thanks
Christophe

Re: [PATCH v1 5/5] powerpc/64e: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')

[Michael Ellerman]

Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> Le 11/12/2022 à 18:32, Pali Rohár a écrit :
>> On Monday 11 July 2022 16:19:33 Christophe Leroy wrote:
>>> With GCC 12, corenet64_smp_defconfig leads to the following build errors:
>>>
>>>    CC      arch/powerpc/kernel/irq.o
>>> {standard input}: Assembler messages:
>>> {standard input}:3616: Error: unrecognized opcode: `wrteei'
>>> {standard input}:5689: Error: unrecognized opcode: `wrteei'
>>>    CC      arch/powerpc/kernel/pmc.o
>>> {standard input}: Assembler messages:
>>> {standard input}:42: Error: unrecognized opcode: `mfpmr'
>>> {standard input}:53: Error: unrecognized opcode: `mtpmr'
>>>    CC      arch/powerpc/kernel/io.o
>>> {standard input}: Assembler messages:
>>> {standard input}:376: Error: unrecognized opcode: `mbar'
>>> ...
>>>    CC      arch/powerpc/mm/nohash/book3e_hugetlbpage.o
>>> {standard input}: Assembler messages:
>>> {standard input}:291: Error: unrecognized opcode: `tlbsx'
>>> {standard input}:482: Error: unrecognized opcode: `tlbwe'
>>> {standard input}:608: Error: unrecognized opcode: `lbarx'
>>> {standard input}:608: Error: unrecognized opcode: `stbcx.'
>>>
>>> -mpcu=powerpc64 cannot be used anymore for book3e, it must be a booke CPU.
>>>
>>> But then we get:
>>>
>>>    CC      arch/powerpc/lib/xor_vmx.o
>>> cc1: error: AltiVec not supported in this target
>>>
>>> Altivec is not supported with -mcpu=e5500 so don't allow selection
>>> of altivec when e5500 is selected.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>>> ---
>>>   arch/powerpc/Makefile                  | 8 +-------
>>>   arch/powerpc/platforms/Kconfig.cputype | 8 ++++----
>>>   2 files changed, 5 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
>>> index d54e1fe03551..02742facf895 100644
>>> --- a/arch/powerpc/Makefile
>>> +++ b/arch/powerpc/Makefile
>>> @@ -168,13 +168,7 @@ endif
>>>   CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>>   AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>>   
>>> -# Altivec option not allowed with e500mc64 in GCC.
>>> -ifdef CONFIG_ALTIVEC
>>> -E5500_CPU := -mcpu=powerpc64
>>> -else
>>> -E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
>>> -endif
>>> -CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
>>> +CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
>>>   CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
>> 
>> Hello! I think that there is an issue. After removal of E5500_CPU
>> variable few line above, it cannot be used in CFLAGS-$(CONFIG_E6500_CPU)
>> assignment, because it is empty.
>> 
>
> Ah yes, you are right.
>
> It should be fixed by 
> https://github.com/linuxppc/linux/commit/f2636eaac7dee1d7d096cc115ff4f5111b0c508c
>
> Michael, I see the patch is in next-test. Can you add:
>
> Fixes: d6b551b8f90c ("powerpc/64e: Fix build failure with GCC 12 
> (unrecognized opcode: `wrteei')")

Yep, will do.

cheers

Re: [PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

[Segher Boessenkool]

Hi!

On Mon, Jul 11, 2022 at 04:19:29PM +0200, Christophe Leroy wrote:
> Commit 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
> enlarged the CPU selection logic to PPC32 by removing depend to
> PPC64, and failed to restrict that depend to E5500_CPU and E6500_CPU.
> Fortunately that got unnoticed because -mcpu=8540 will override the
> -mcpu=e500mc64 or -mpcu=e6500 as they are ealier, but that's
> fragile and may no be right in the future.

A later -mcpu= always overrides an earlier one.  This is the same as
with all other GCC option flags, and will not change in the future.


Segher

Re: [PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

[Christophe Leroy]

Le 11/07/2022 à 18:39, Segher Boessenkool a écrit :
> Hi!
> 
> On Mon, Jul 11, 2022 at 04:19:29PM +0200, Christophe Leroy wrote:
>> Commit 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
>> enlarged the CPU selection logic to PPC32 by removing depend to
>> PPC64, and failed to restrict that depend to E5500_CPU and E6500_CPU.
>> Fortunately that got unnoticed because -mcpu=8540 will override the
>> -mcpu=e500mc64 or -mpcu=e6500 as they are ealier, but that's
>> fragile and may no be right in the future.
> 
> A later -mcpu= always overrides an earlier one.  This is the same as
> with all other GCC option flags, and will not change in the future.
> 


By "future" I meant after patch 2.

At the time being, if you select PPC32 and MPC_85xx and E6500_CPU, you 
get -mcpu=e6500 -mcpu=8540.

After patch 2, if you select PPC32 and MPC_85xx and E6500_CPU, you get 
-mcpu=e6500

Christophe

Re: [PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

[Michael Ellerman]

On Mon, 11 Jul 2022 16:19:29 +0200, Christophe Leroy wrote:
> Commit 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
> enlarged the CPU selection logic to PPC32 by removing depend to
> PPC64, and failed to restrict that depend to E5500_CPU and E6500_CPU.
> Fortunately that got unnoticed because -mcpu=8540 will override the
> -mcpu=e500mc64 or -mpcu=e6500 as they are ealier, but that's
> fragile and may no be right in the future.
> 
> [...]

Applied to powerpc/next.

[1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32
      https://git.kernel.org/powerpc/c/9be013b2a9ecb29b5168e4b9db0e48ed53acf37c
[2/5] powerpc/32: Don't always pass -mcpu=powerpc to the compiler
      https://git.kernel.org/powerpc/c/446cda1b21d9a6b3697fe399c6a3a00ff4a285f5
[3/5] powerpc/405: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')
      https://git.kernel.org/powerpc/c/ff27d9200a98757efc7c2cdf198904fd79cf4ffd
[4/5] powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')
      https://git.kernel.org/powerpc/c/2255411d1d0f0661d1e5acd5f6edf4e6652a345a
[5/5] powerpc/64e: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')
      https://git.kernel.org/powerpc/c/d6b551b8f90cc92c7d3c09cf38c748efe305ecb4

cheers