From: Clement Courbet courbet@google.com
commit c17eb4dca5a353a9dbbb8ad6934fe57af7165e91 upstream.
Declaring setjmp()/longjmp() as taking longs makes the signature non-standard, and makes clang complain. In the past, this has been worked around by adding -ffreestanding to the compile flags.
The implementation looks like it only ever propagates the value (in longjmp) or sets it to 1 (in setjmp), and we only call longjmp with integer parameters.
This allows removing -ffreestanding from the compilation flags.
Fixes: c9029ef9c957 ("powerpc: Avoid clang warnings around setjmp and longjmp") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Clement Courbet courbet@google.com Reviewed-by: Nathan Chancellor natechancellor@gmail.com Tested-by: Nathan Chancellor natechancellor@gmail.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20200330080400.124803-1-courbet@google.com Signed-off-by: Nathan Chancellor natechancellor@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/include/asm/setjmp.h | 6 ++++-- arch/powerpc/kernel/Makefile | 3 --- arch/powerpc/xmon/Makefile | 3 --- 3 files changed, 4 insertions(+), 8 deletions(-)
--- a/arch/powerpc/include/asm/setjmp.h +++ b/arch/powerpc/include/asm/setjmp.h @@ -12,7 +12,9 @@
#define JMP_BUF_LEN 23
-extern long setjmp(long *) __attribute__((returns_twice)); -extern void longjmp(long *, long) __attribute__((noreturn)); +typedef long jmp_buf[JMP_BUF_LEN]; + +extern int setjmp(jmp_buf env) __attribute__((returns_twice)); +extern void longjmp(jmp_buf env, int val) __attribute__((noreturn));
#endif /* _ASM_POWERPC_SETJMP_H */ --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -5,9 +5,6 @@
CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
-# Avoid clang warnings around longjmp/setjmp declarations -CFLAGS_crash.o += -ffreestanding - subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
ifeq ($(CONFIG_PPC64),y) --- a/arch/powerpc/xmon/Makefile +++ b/arch/powerpc/xmon/Makefile @@ -1,9 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for xmon
-# Avoid clang warnings around longjmp/setjmp declarations -subdir-ccflags-y := -ffreestanding - subdir-ccflags-$(CONFIG_PPC_WERROR) += -Werror
GCOV_PROFILE := n