Re: [PATCH v7 4/6] powerpc/64: make buildable without CONFIG_COMPAT

From: Michal SuchÃnek
Date: Sat Aug 31 2019 - 09:02:45 EST

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On Fri, 30 Aug 2019 23:03:41 +0200
Michal Suchanek <msuchanek@xxxxxxx> wrote:

> There are numerous references to 32bit functions in generic and 64bit
> code so ifdef them out.
>
> Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
> ---
> v2:
> - fix 32bit ifdef condition in signal.c
> - simplify the compat ifdef condition in vdso.c - 64bit is redundant
> - simplify the compat ifdef condition in callchain.c - 64bit is redundant
> v3:
> - use IS_ENABLED and maybe_unused where possible
> - do not ifdef declarations
> - clean up Makefile
> v4:
> - further makefile cleanup
> - simplify is_32bit_task conditions
> - avoid ifdef in condition by using return
> v5:
> - avoid unreachable code on 32bit
> - make is_current_64bit constant on !COMPAT
> - add stub perf_callchain_user_32 to avoid some ifdefs
> v6:
> - consolidate current_is_64bit
> v7:
> - remove leftover perf_callchain_user_32 stub from previous series version

removed too much stuff here

> ---
> arch/powerpc/include/asm/thread_info.h | 4 ++--
> arch/powerpc/kernel/Makefile | 7 +++---
> arch/powerpc/kernel/entry_64.S | 2 ++
> arch/powerpc/kernel/signal.c | 3 +--
> arch/powerpc/kernel/syscall_64.c | 6 ++---
> arch/powerpc/kernel/vdso.c | 5 ++---
> arch/powerpc/perf/callchain.c | 31 +++++++++++++-------------
> 7 files changed, 27 insertions(+), 31 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
> index 8e1d0195ac36..c128d8a48ea3 100644
> --- a/arch/powerpc/include/asm/thread_info.h
> +++ b/arch/powerpc/include/asm/thread_info.h
> @@ -144,10 +144,10 @@ static inline bool test_thread_local_flags(unsigned int flags)
> return (ti->local_flags & flags) != 0;
> }
>
> -#ifdef CONFIG_PPC64
> +#ifdef CONFIG_COMPAT
> #define is_32bit_task() (test_thread_flag(TIF_32BIT))
> #else
> -#define is_32bit_task() (1)
> +#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
> #endif
>
> #if defined(CONFIG_PPC64)
> diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
> index 1d646a94d96c..9d8772e863b9 100644
> --- a/arch/powerpc/kernel/Makefile
> +++ b/arch/powerpc/kernel/Makefile
> @@ -44,16 +44,15 @@ CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING
> endif
>
> obj-y := cputable.o ptrace.o syscalls.o \
> - irq.o align.o signal_32.o pmc.o vdso.o \
> + irq.o align.o signal_$(BITS).o pmc.o vdso.o \
> process.o systbl.o idle.o \
> signal.o sysfs.o cacheinfo.o time.o \
> prom.o traps.o setup-common.o \
> udbg.o misc.o io.o misc_$(BITS).o \
> of_platform.o prom_parse.o
> -obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \
> - signal_64.o ptrace32.o \
> - paca.o nvram_64.o firmware.o \
> +obj-$(CONFIG_PPC64) += setup_64.o paca.o nvram_64.o firmware.o \
> syscall_64.o
> +obj-$(CONFIG_COMPAT) += sys_ppc32.o ptrace32.o signal_32.o
> obj-$(CONFIG_VDSO32) += vdso32/
> obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o
> obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
> diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
> index 2ec825a85f5b..a2dbf216f607 100644
> --- a/arch/powerpc/kernel/entry_64.S
> +++ b/arch/powerpc/kernel/entry_64.S
> @@ -51,8 +51,10 @@
> SYS_CALL_TABLE:
> .tc sys_call_table[TC],sys_call_table
>
> +#ifdef CONFIG_COMPAT
> COMPAT_SYS_CALL_TABLE:
> .tc compat_sys_call_table[TC],compat_sys_call_table
> +#endif
>
> /* This value is used to mark exception frames on the stack. */
> exception_marker:
> diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
> index 60436432399f..61678cb0e6a1 100644
> --- a/arch/powerpc/kernel/signal.c
> +++ b/arch/powerpc/kernel/signal.c
> @@ -247,7 +247,6 @@ static void do_signal(struct task_struct *tsk)
> sigset_t *oldset = sigmask_to_save();
> struct ksignal ksig = { .sig = 0 };
> int ret;
> - int is32 = is_32bit_task();
>
> BUG_ON(tsk != current);
>
> @@ -277,7 +276,7 @@ static void do_signal(struct task_struct *tsk)
>
> rseq_signal_deliver(&ksig, tsk->thread.regs);
>
> - if (is32) {
> + if (is_32bit_task()) {
> if (ksig.ka.sa.sa_flags & SA_SIGINFO)
> ret = handle_rt_signal32(&ksig, oldset, tsk);
> else
> diff --git a/arch/powerpc/kernel/syscall_64.c b/arch/powerpc/kernel/syscall_64.c
> index 98ed970796d5..0d5cbbe54cf1 100644
> --- a/arch/powerpc/kernel/syscall_64.c
> +++ b/arch/powerpc/kernel/syscall_64.c
> @@ -38,7 +38,6 @@ typedef long (*syscall_fn)(long, long, long, long, long, long);
>
> long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, unsigned long r0, struct pt_regs *regs)
> {
> - unsigned long ti_flags;
> syscall_fn f;
>
> BUG_ON(!(regs->msr & MSR_PR));
> @@ -83,8 +82,7 @@ long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8,
> */
> regs->softe = IRQS_ENABLED;
>
> - ti_flags = current_thread_info()->flags;
> - if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) {
> + if (unlikely(current_thread_info()->flags & _TIF_SYSCALL_DOTRACE)) {
> /*
> * We use the return value of do_syscall_trace_enter() as the
> * syscall number. If the syscall was rejected for any reason
> @@ -100,7 +98,7 @@ long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8,
> /* May be faster to do array_index_nospec? */
> barrier_nospec();
>
> - if (unlikely(ti_flags & _TIF_32BIT)) {
> + if (unlikely(is_32bit_task())) {
> f = (void *)compat_sys_call_table[r0];
>
> r3 &= 0x00000000ffffffffULL;
> diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
> index d60598113a9f..6d4a077f74d6 100644
> --- a/arch/powerpc/kernel/vdso.c
> +++ b/arch/powerpc/kernel/vdso.c
> @@ -667,9 +667,7 @@ static void __init vdso_setup_syscall_map(void)
> {
> unsigned int i;
> extern unsigned long *sys_call_table;
> -#ifdef CONFIG_PPC64
> extern unsigned long *compat_sys_call_table;
> -#endif
> extern unsigned long sys_ni_syscall;
>
>
> @@ -678,7 +676,8 @@ static void __init vdso_setup_syscall_map(void)
> if (sys_call_table[i] != sys_ni_syscall)
> vdso_data->syscall_map_64[i >> 5] |=
> 0x80000000UL >> (i & 0x1f);
> - if (compat_sys_call_table[i] != sys_ni_syscall)
> + if (IS_ENABLED(CONFIG_COMPAT) &&
> + compat_sys_call_table[i] != sys_ni_syscall)
> vdso_data->syscall_map_32[i >> 5] |=
> 0x80000000UL >> (i & 0x1f);
> #else /* CONFIG_PPC64 */
> diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
> index b7cdcce20280..9b8dc822f531 100644
> --- a/arch/powerpc/perf/callchain.c
> +++ b/arch/powerpc/perf/callchain.c
> @@ -15,7 +15,7 @@
> #include <asm/sigcontext.h>
> #include <asm/ucontext.h>
> #include <asm/vdso.h>
> -#ifdef CONFIG_PPC64
> +#ifdef CONFIG_COMPAT
> #include "../kernel/ppc32.h"
> #endif
> #include <asm/pte-walk.h>
> @@ -268,16 +268,6 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
> }
> }
>
> -static inline int current_is_64bit(void)
> -{
> - /*
> - * We can't use test_thread_flag() here because we may be on an
> - * interrupt stack, and the thread flags don't get copied over
> - * from the thread_info on the main stack to the interrupt stack.
> - */
> - return !test_ti_thread_flag(task_thread_info(current), TIF_32BIT);
> -}
> -
> #else /* CONFIG_PPC64 */
> static int read_user_stack_slow(void __user *ptr, void *buf, int nb)
> {
> @@ -314,11 +304,6 @@ static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry
> {
> }
>
> -static inline int current_is_64bit(void)
> -{
> - return 0;
> -}
> -
> static inline int valid_user_sp(unsigned long sp, int is_64)
> {
> if (!sp || (sp & 7) || sp > TASK_SIZE - 32)
> @@ -334,6 +319,7 @@ static inline int valid_user_sp(unsigned long sp, int is_64)
>
> #endif /* CONFIG_PPC64 */
>
> +#if defined(CONFIG_PPC32) || defined(CONFIG_COMPAT)
> /*
> * Layout for non-RT signal frames
> */
> @@ -475,6 +461,19 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
> sp = next_sp;
> }
> }
> +#endif /* 32bit */
> +
> +static inline int current_is_64bit(void)
> +{
> + if (!IS_ENABLED(CONFIG_COMPAT))
> + return IS_ENABLED(CONFIG_PPC64);
> + /*
> + * We can't use test_thread_flag() here because we may be on an
> + * interrupt stack, and the thread flags don't get copied over
> + * from the thread_info on the main stack to the interrupt stack.
> + */
> + return !test_ti_thread_flag(task_thread_info(current), TIF_32BIT);
> +}
>
> void
> perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)

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Previous message: kbuild test robot: "Re: [PATCH] arm: fix page faults in do_alignment"
In reply to: Christophe Leroy: "Re: [PATCH v7 4/6] powerpc/64: make buildable without CONFIG_COMPAT"
Next in thread: Christophe Leroy: "Re: [PATCH v7 0/6] Disable compat cruft on ppc64le v7"
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