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Date: Thu, 16 Apr 2020 15:24:32 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Clement Courbet <courbet@...gle.com>, Nathan Chancellor <natechancellor@...il.com>, Michael Ellerman <mpe@...erman.id.au> Subject: [PATCH 4.19 131/146] powerpc: Make setjmp/longjmp signature standard From: Clement Courbet <courbet@...gle.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@...r.kernel.org # v4.14+ Signed-off-by: Clement Courbet <courbet@...gle.com> Reviewed-by: Nathan Chancellor <natechancellor@...il.com> Tested-by: Nathan Chancellor <natechancellor@...il.com> Signed-off-by: Michael Ellerman <mpe@...erman.id.au> Link: https://lore.kernel.org/r/20200330080400.124803-1-courbet@google.com Signed-off-by: Nathan Chancellor <natechancellor@...il.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 ifdef CONFIG_PPC64 --- 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
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