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SubjectRe: [PATCH v2 1/4] arm64: vdso32: Introduce COMPAT_CC_IS_GCC
On Thu, Sep 26, 2019 at 02:38:02PM +0100, Vincenzo Frascino wrote:
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 37c610963eee..13e2d2e16af7 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -110,7 +110,7 @@ config ARM64
> select GENERIC_STRNLEN_USER
> select GENERIC_TIME_VSYSCALL
> select GENERIC_GETTIMEOFDAY
> - select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT)
> + select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT && COMPATCC_IS_GCC)
> select HANDLE_DOMAIN_IRQ
> select HARDIRQS_SW_RESEND
> select HAVE_PCI
> @@ -313,6 +313,9 @@ config KASAN_SHADOW_OFFSET
> default 0xeffffff900000000 if ARM64_VA_BITS_36 && KASAN_SW_TAGS
> default 0xffffffffffffffff
>
> +config COMPATCC_IS_GCC
> + def_bool $(success,$(CROSS_COMPILE_COMPAT)gcc --version | head -n 1 | grep -q arm)

Nitpick: COMPAT_CC_IS_ARM_GCC together with 'grep -q "arm-.*-gcc"'

The patch below allows me to use $(COMPATCC) directly here and also set
either CROSS_COMPILE_COMPAT or COMPATCC on the command line:

----------8<----------------------------------
diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild
index 75cf8c796d0e..d6465823b281 100644
--- a/arch/arm64/Kbuild
+++ b/arch/arm64/Kbuild
@@ -4,9 +4,3 @@ obj-$(CONFIG_NET) += net/
obj-$(CONFIG_KVM) += kvm/
obj-$(CONFIG_XEN) += xen/
obj-$(CONFIG_CRYPTO) += crypto/
-
-# as-instr-compat
-# Usage: cflags-y += $(call as-instr-compat,instr,option1,option2)
-
-as-instr-compat = $(call try-run,\
- printf "%b\n" "$(1)" | $(COMPATCC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5d4be0b4f980..811c89fa2b71 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -110,7 +110,7 @@ config ARM64
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_GETTIMEOFDAY
- select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT && COMPATCC_IS_GCC)
+ select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT && COMPATCC_IS_ARM_GCC)
select HANDLE_DOMAIN_IRQ
select HARDIRQS_SW_RESEND
select HAVE_PCI
@@ -313,8 +313,8 @@ config KASAN_SHADOW_OFFSET
default 0xeffffff900000000 if ARM64_VA_BITS_36 && KASAN_SW_TAGS
default 0xffffffffffffffff

-config COMPATCC_IS_GCC
- def_bool $(success,$(CROSS_COMPILE_COMPAT)gcc --version | head -n 1 | grep -q arm)
+config COMPATCC_IS_ARM_GCC
+ def_bool $(success,$(COMPATCC) --version | head -n 1 | grep -q "arm-.*-gcc")

source "arch/arm64/Kconfig.platforms"

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 34f53eb11878..6b4eb5c444c5 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -53,6 +53,9 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable)
endif
endif

+COMPATCC ?= $(CROSS_COMPILE_COMPAT)gcc
+export COMPATCC
+
ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
export CONFIG_COMPAT_VDSO := y
compat_vdso := -DCONFIG_COMPAT_VDSO=1
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index 22f0d31ea528..77aa61340374 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -8,8 +8,6 @@
ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
include $(srctree)/lib/vdso/Makefile

-COMPATCC := $(CROSS_COMPILE_COMPAT)gcc
-
# Same as cc-*option, but using COMPATCC instead of CC
cc32-option = $(call try-run,\
$(COMPATCC) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
\
 
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