[PATCH 1/2] powerpc: Disable attribute-alias warnings from gcc8

[PATCH 1/2] powerpc: Disable attribute-alias warnings from gcc8

[Khem Raj]

Fixes
alias between functions of incompatible types warnings
which are new with gcc8

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/kernel/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 2b4c40b255e4..7ac5a68ad6b1 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -3,7 +3,8 @@
 # Makefile for the linux kernel.
 #
 
-CFLAGS_ptrace.o		+= -DUTS_MACHINE='"$(UTS_MACHINE)"'
+CFLAGS_ptrace.o		+= -DUTS_MACHINE='"$(UTS_MACHINE)"' $(call cc-disable-warning, attribute-alias)
+CFLAGS_syscalls.o	+= $(call cc-disable-warning, attribute-alias)
 
 subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
 
-- 
2.17.0

[PATCH 2/2] powerpc/ptrace: Disable array-bounds warning with gcc8

[Khem Raj]

This masks the new gcc8 warning

regset.h:270:4: error: 'memcpy' offset [-527, -529] is out
of the bounds [0, 16] of object 'vrsave' with type 'union <anonymous>'

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/kernel/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 7ac5a68ad6b1..ab159a34704a 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -4,6 +4,7 @@
 #
 
 CFLAGS_ptrace.o		+= -DUTS_MACHINE='"$(UTS_MACHINE)"' $(call cc-disable-warning, attribute-alias)
+CFLAGS_ptrace.o		+= $(call cc-disable-warning, array-bounds)
 CFLAGS_syscalls.o	+= $(call cc-disable-warning, attribute-alias)
 
 subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
-- 
2.17.0

Re: [PATCH 2/2] powerpc/ptrace: Disable array-bounds warning with gcc8

[Michael Ellerman]

Khem Raj <raj.khem@gmail.com> writes:

> This masks the new gcc8 warning
>
> regset.h:270:4: error: 'memcpy' offset [-527, -529] is out
> of the bounds [0, 16] of object 'vrsave' with type 'union <anonymous>'

Why would we want to mask the warning rather than fix it?

cheers

> Signed-off-by: Khem Raj <raj.khem@gmail.com>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: linuxppc-dev@lists.ozlabs.org
> ---
>  arch/powerpc/kernel/Makefile | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
> index 7ac5a68ad6b1..ab159a34704a 100644
> --- a/arch/powerpc/kernel/Makefile
> +++ b/arch/powerpc/kernel/Makefile
> @@ -4,6 +4,7 @@
>  #
>  
>  CFLAGS_ptrace.o		+= -DUTS_MACHINE='"$(UTS_MACHINE)"' $(call cc-disable-warning, attribute-alias)
> +CFLAGS_ptrace.o		+= $(call cc-disable-warning, array-bounds)
>  CFLAGS_syscalls.o	+= $(call cc-disable-warning, attribute-alias)
>  
>  subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
> -- 
> 2.17.0