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SubjectRe: [PATCH v2] powerpc: fix build failure by disabling attribute-alias warning
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On 05/29/2018 06:58 AM, Christophe Leroy wrote:
> Latest GCC version emit the following warnings
>
> As arch/powerpc code is built with -Werror, this breaks build with
> GCC 8.1

Argh ...

Now, I get the following error with older GCC:

arch/powerpc/kernel/syscalls.c:66:9: error: unknown option after
‘#pragma GCC diagnostic’ kind [-Werror=pragmas]

Is there a way to get something compatible with both GCC versions ?

Christophe

>
> This patch inhibits those warnings
>
> CC arch/powerpc/kernel/syscalls.o
> In file included from arch/powerpc/kernel/syscalls.c:24:
> ./include/linux/syscalls.h:233:18: error: 'sys_mmap2' alias between functions of incompatible types 'long int(long unsigned int, size_t, long unsigned int, long unsigned int, long unsigned int, long unsigned int)' {aka 'long int(long unsigned int, long unsigned int, long unsigned int, long unsigned int, long unsigned int, long unsigned int)'} and 'long int(long int, long int, long int, long int, long int, long int)' [-Werror=attribute-alias]
> asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> ^~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/syscalls.c:65:1: note: in expansion of macro 'SYSCALL_DEFINE6'
> SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
> ^~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:238:18: note: aliased declaration here
> asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> ^~~~~~~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/syscalls.c:65:1: note: in expansion of macro 'SYSCALL_DEFINE6'
> SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
> ^~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:233:18: error: 'sys_mmap' alias between functions of incompatible types 'long int(long unsigned int, size_t, long unsigned int, long unsigned int, long unsigned int, off_t)' {aka 'long int(long unsigned int, long unsigned int, long unsigned int, long unsigned int, long unsigned int, long int)'} and 'long int(long int, long int, long int, long int, long int, long int)' [-Werror=attribute-alias]
> asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> ^~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/syscalls.c:72:1: note: in expansion of macro 'SYSCALL_DEFINE6'
> SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
> ^~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:238:18: note: aliased declaration here
> asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> ^~~~~~~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/syscalls.c:72:1: note: in expansion of macro 'SYSCALL_DEFINE6'
> SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
> ^~~~~~~~~~~~~~~
> CC arch/powerpc/kernel/signal_32.o
> In file included from arch/powerpc/kernel/signal_32.c:31:
> ./include/linux/compat.h:74:18: error: 'compat_sys_swapcontext' alias between functions of incompatible types 'long int(struct ucontext32 *, struct ucontext32 *, int)' and 'long int(long int, long int, long int)' [-Werror=attribute-alias]
> asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> ^~~~~~~~~~
> ./include/linux/compat.h:58:2: note: in expansion of macro 'COMPAT_SYSCALL_DEFINEx'
> COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/kernel/signal_32.c:1041:1: note: in expansion of macro 'COMPAT_SYSCALL_DEFINE3'
> COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> ^~~~~~~~~~~~~~~~~~~~~~
> ./include/linux/compat.h:79:18: note: aliased declaration here
> asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> ^~~~~~~~~~~~~~~
> ./include/linux/compat.h:58:2: note: in expansion of macro 'COMPAT_SYSCALL_DEFINEx'
> COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/kernel/signal_32.c:1041:1: note: in expansion of macro 'COMPAT_SYSCALL_DEFINE3'
> COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> ^~~~~~~~~~~~~~~~~~~~~~
> CC arch/powerpc/kernel/signal_64.o
> In file included from arch/powerpc/kernel/signal_64.c:27:
> ./include/linux/syscalls.h:233:18: error: 'sys_swapcontext' alias between functions of incompatible types 'long int(struct ucontext *, struct ucontext *, long int)' and 'long int(long int, long int, long int)' [-Werror=attribute-alias]
> asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> ^~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/signal_64.c:628:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> ^~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:238:18: note: aliased declaration here
> asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> ^~~~~~~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/signal_64.c:628:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> ^~~~~~~~~~~~~~~
> CC arch/powerpc/kernel/rtas.o
> In file included from arch/powerpc/kernel/rtas.c:29:
> ./include/linux/syscalls.h:233:18: error: 'sys_rtas' alias between functions of incompatible types 'long int(struct rtas_args *)' and 'long int(long int)' [-Werror=attribute-alias]
> asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> ^~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:211:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/rtas.c:1054:1: note: in expansion of macro 'SYSCALL_DEFINE1'
> SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
> ^~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:238:18: note: aliased declaration here
> asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> ^~~~~~~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:211:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/rtas.c:1054:1: note: in expansion of macro 'SYSCALL_DEFINE1'
> SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
> ^~~~~~~~~~~~~~~
> CC arch/powerpc/kernel/pci_64.o
> In file included from arch/powerpc/kernel/pci_64.c:23:
> ./include/linux/syscalls.h:233:18: error: 'sys_pciconfig_iobase' alias between functions of incompatible types 'long int(long int, long unsigned int, long unsigned int)' and 'long int(long int, long int, long int)' [-Werror=attribute-alias]
> asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> ^~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/pci_64.c:206:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
> ^~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:238:18: note: aliased declaration here
> asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> ^~~~~~~~
> ./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> ^~~~~~~~~~~~~~~~~
> ./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> ^~~~~~~~~~~~~~~
> arch/powerpc/kernel/pci_64.c:206:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
> ^~~~~~~~~~~~~~~
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
> arch/powerpc/kernel/pci_64.c | 3 +++
> arch/powerpc/kernel/rtas.c | 3 +++
> arch/powerpc/kernel/signal_32.c | 6 ++++++
> arch/powerpc/kernel/signal_64.c | 3 +++
> arch/powerpc/kernel/syscalls.c | 3 +++
> arch/powerpc/mm/subpage-prot.c | 3 +++
> 6 files changed, 21 insertions(+)
>
> diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
> index dff28f903512..a8bf98c1cf0c 100644
> --- a/arch/powerpc/kernel/pci_64.c
> +++ b/arch/powerpc/kernel/pci_64.c
> @@ -203,6 +203,8 @@ void pcibios_setup_phb_io_space(struct pci_controller *hose)
> #define IOBASE_ISA_IO 3
> #define IOBASE_ISA_MEM 4
>
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
> unsigned long, in_devfn)
> {
> @@ -256,6 +258,7 @@ SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
>
> return -EOPNOTSUPP;
> }
> +#pragma GCC diagnostic pop
>
> #ifdef CONFIG_NUMA
> int pcibus_to_node(struct pci_bus *bus)
> diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
> index 8afd146bc9c7..c1713cef1642 100644
> --- a/arch/powerpc/kernel/rtas.c
> +++ b/arch/powerpc/kernel/rtas.c
> @@ -1051,6 +1051,8 @@ struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
> }
>
> /* We assume to be passed big endian arguments */
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
> {
> struct rtas_args args;
> @@ -1137,6 +1139,7 @@ SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
>
> return 0;
> }
> +#pragma GCC diagnostic pop
>
> /*
> * Call early during boot, before mem init, to retrieve the RTAS
> diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
> index 9cf8a03d3bc7..db1042f37b94 100644
> --- a/arch/powerpc/kernel/signal_32.c
> +++ b/arch/powerpc/kernel/signal_32.c
> @@ -1037,6 +1037,8 @@ static int do_setcontext_tm(struct ucontext __user *ucp,
> }
> #endif
>
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> #ifdef CONFIG_PPC64
> COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> struct ucontext __user *, new_ctx, int, ctx_size)
> @@ -1132,6 +1134,7 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> set_thread_flag(TIF_RESTOREALL);
> return 0;
> }
> +#pragma GCC diagnostic pop
>
> #ifdef CONFIG_PPC64
> COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
> @@ -1228,6 +1231,8 @@ SYSCALL_DEFINE0(rt_sigreturn)
> return 0;
> }
>
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> #ifdef CONFIG_PPC32
> SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
> int, ndbg, struct sig_dbg_op __user *, dbg)
> @@ -1333,6 +1338,7 @@ SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
> return 0;
> }
> #endif
> +#pragma GCC diagnostic pop
>
> /*
> * OK, we're invoking a handler
> diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
> index 83d51bf586c7..d2e8da8cf27f 100644
> --- a/arch/powerpc/kernel/signal_64.c
> +++ b/arch/powerpc/kernel/signal_64.c
> @@ -625,6 +625,8 @@ static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
> /*
> * Handle {get,set,swap}_context operations
> */
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> struct ucontext __user *, new_ctx, long, ctx_size)
> {
> @@ -690,6 +692,7 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
> set_thread_flag(TIF_RESTOREALL);
> return 0;
> }
> +#pragma GCC diagnostic pop
>
>
> /*
> diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
> index 466216506eb2..d08119590185 100644
> --- a/arch/powerpc/kernel/syscalls.c
> +++ b/arch/powerpc/kernel/syscalls.c
> @@ -62,6 +62,8 @@ static inline long do_mmap2(unsigned long addr, size_t len,
> return ret;
> }
>
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
> unsigned long, prot, unsigned long, flags,
> unsigned long, fd, unsigned long, pgoff)
> @@ -75,6 +77,7 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
> {
> return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
> }
> +#pragma GCC diagnostic pop
>
> #ifdef CONFIG_PPC32
> /*
> diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c
> index 9d16ee251fc0..edf09fd4ba80 100644
> --- a/arch/powerpc/mm/subpage-prot.c
> +++ b/arch/powerpc/mm/subpage-prot.c
> @@ -186,6 +186,8 @@ static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,
> * in a 2-bit field won't allow writes to a page that is otherwise
> * write-protected.
> */
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wattribute-alias"
> SYSCALL_DEFINE3(subpage_prot, unsigned long, addr,
> unsigned long, len, u32 __user *, map)
> {
> @@ -269,3 +271,4 @@ SYSCALL_DEFINE3(subpage_prot, unsigned long, addr,
> up_write(&mm->mmap_sem);
> return err;
> }
> +#pragma GCC diagnostic pop
>

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