* Re: [PATCH 2/2] futex: remove futex_cmpxchg detection
2021-10-26 10:03 ` [PATCH 2/2] futex: remove futex_cmpxchg detection Arnd Bergmann
@ 2021-10-26 10:16 ` Geert Uytterhoeven
2021-10-26 10:38 ` Russell King (Oracle)
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Geert Uytterhoeven @ 2021-10-26 10:16 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Peter Zijlstra, Thomas Gleixner, Ingo Molnar, Arnd Bergmann,
Vineet Gupta, Russell King, Catalin Marinas, Will Deacon,
Guo Ren, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Heiko Carstens, Vasily Gorbik, Christian Borntraeger,
Alexander Gordeev, Yoshinori Sato, Rich Felker, Jeff Dike,
Richard Weinberger, Anton Ivanov, Chris Zankel, Max Filippov,
Darren Hart, Davidlohr Bueso, André Almeida, Andrew Morton,
Mike Rapoport, Mark Rutland, Anshuman Khandual, arcml,
Linux Kernel Mailing List, Linux ARM, linux-csky, linux-m68k,
linux-riscv, linux-s390, Linux-sh list, linux-um,
open list:TENSILICA XTENSA PORT (xtensa)
On Tue, Oct 26, 2021 at 12:06 PM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Now that all architectures have a working futex implementation
> in any configuration, remove the runtime detection code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> arch/m68k/Kconfig | 1 -
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 2/2] futex: remove futex_cmpxchg detection
2021-10-26 10:03 ` [PATCH 2/2] futex: remove futex_cmpxchg detection Arnd Bergmann
2021-10-26 10:16 ` Geert Uytterhoeven
@ 2021-10-26 10:38 ` Russell King (Oracle)
2021-10-26 10:43 ` Christian Borntraeger
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Russell King (Oracle) @ 2021-10-26 10:38 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Peter Zijlstra, Thomas Gleixner, Ingo Molnar, Arnd Bergmann,
Vineet Gupta, Catalin Marinas, Will Deacon, Guo Ren,
Geert Uytterhoeven, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Heiko Carstens, Vasily Gorbik, Christian Borntraeger,
Alexander Gordeev, Yoshinori Sato, Rich Felker, Jeff Dike,
Richard Weinberger, Anton Ivanov, Chris Zankel, Max Filippov,
Darren Hart, Davidlohr Bueso, André Almeida, Andrew Morton,
Mike Rapoport, Mark Rutland, Anshuman Khandual, linux-snps-arc,
linux-kernel, linux-arm-kernel, linux-csky, linux-m68k,
linux-riscv, linux-s390, linux-sh, linux-um, linux-xtensa
On Tue, Oct 26, 2021 at 12:03:48PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Now that all architectures have a working futex implementation
> in any configuration, remove the runtime detection code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
For ARM:
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
As Arnd explained to me what was going on, I'll include it here...
This patch requires patch 1 which touches other architectures, so
it is not an independent patch.
Patch 1 can be found at:
https://lore.kernel.org/lkml/20211026100432.1730393-1-arnd@kernel.org/T/#t
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 2/2] futex: remove futex_cmpxchg detection
2021-10-26 10:03 ` [PATCH 2/2] futex: remove futex_cmpxchg detection Arnd Bergmann
2021-10-26 10:16 ` Geert Uytterhoeven
2021-10-26 10:38 ` Russell King (Oracle)
@ 2021-10-26 10:43 ` Christian Borntraeger
2021-10-26 12:30 ` Max Filippov
2021-10-26 20:26 ` Rich Felker
4 siblings, 0 replies; 6+ messages in thread
From: Christian Borntraeger @ 2021-10-26 10:43 UTC (permalink / raw)
To: Arnd Bergmann, Peter Zijlstra, Thomas Gleixner, Ingo Molnar
Cc: Arnd Bergmann, Vineet Gupta, Russell King, Catalin Marinas,
Will Deacon, Guo Ren, Geert Uytterhoeven, Paul Walmsley,
Palmer Dabbelt, Albert Ou, Heiko Carstens, Vasily Gorbik,
Alexander Gordeev, Yoshinori Sato, Rich Felker, Jeff Dike,
Richard Weinberger, Anton Ivanov, Chris Zankel, Max Filippov,
Darren Hart, Davidlohr Bueso, André Almeida, Andrew Morton,
Mike Rapoport, Mark Rutland, Anshuman Khandual, linux-snps-arc,
linux-kernel, linux-arm-kernel, linux-csky, linux-m68k,
linux-riscv, linux-s390, linux-sh, linux-um, linux-xtensa
Am 26.10.21 um 12:03 schrieb Arnd Bergmann:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Now that all architectures have a working futex implementation
> in any configuration, remove the runtime detection code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
s390 part
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
> arch/arc/Kconfig | 1 -
> arch/arm/Kconfig | 1 -
> arch/arm64/Kconfig | 1 -
> arch/csky/Kconfig | 1 -
> arch/m68k/Kconfig | 1 -
> arch/riscv/Kconfig | 1 -
> arch/s390/Kconfig | 1 -
> arch/sh/Kconfig | 1 -
> arch/um/Kconfig | 1 -
> arch/um/kernel/skas/uaccess.c | 1 -
> arch/xtensa/Kconfig | 1 -
> init/Kconfig | 8 --------
> kernel/futex/core.c | 35 -----------------------------------
> kernel/futex/futex.h | 6 ------
> kernel/futex/syscalls.c | 22 ----------------------
> 15 files changed, 82 deletions(-)
>
> diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
> index 248389278e8f..f9413041686f 100644
> --- a/arch/arc/Kconfig
> +++ b/arch/arc/Kconfig
> @@ -31,7 +31,6 @@ config ARC
> select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
> select HAVE_DEBUG_STACKOVERFLOW
> select HAVE_DEBUG_KMEMLEAK
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select HAVE_IOREMAP_PROT
> select HAVE_KERNEL_GZIP
> select HAVE_KERNEL_LZMA
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index bb5d2c45477b..6448d311635d 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -93,7 +93,6 @@ config ARM
> select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
> select HAVE_FUNCTION_GRAPH_TRACER if !THUMB2_KERNEL && !CC_IS_CLANG
> select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !(THUMB2_KERNEL && CC_IS_CLANG)
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select HAVE_GCC_PLUGINS
> select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)
> select HAVE_IRQ_TIME_ACCOUNTING
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 0efc501f77aa..6c3c2ff5cef8 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -193,7 +193,6 @@ config ARM64
> select HAVE_PERF_USER_STACK_DUMP
> select HAVE_REGS_AND_STACK_ACCESS_API
> select HAVE_FUNCTION_ARG_ACCESS_API
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select MMU_GATHER_RCU_TABLE_FREE
> select HAVE_RSEQ
> select HAVE_STACKPROTECTOR
> diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
> index 823d3d5a9e11..efd7c5feac8b 100644
> --- a/arch/csky/Kconfig
> +++ b/arch/csky/Kconfig
> @@ -53,7 +53,6 @@ config CSKY
> select HAVE_FUNCTION_TRACER
> select HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_ERROR_INJECTION
> - select HAVE_FUTEX_CMPXCHG if FUTEX && SMP
> select HAVE_FTRACE_MCOUNT_RECORD
> select HAVE_KERNEL_GZIP
> select HAVE_KERNEL_LZO
> diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
> index 0b50da08a9c5..15a793c5b2dc 100644
> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -20,7 +20,6 @@ config M68K
> select HAVE_ASM_MODVERSIONS
> select HAVE_DEBUG_BUGVERBOSE
> select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_HAS_NO_UNALIGNED
> - select HAVE_FUTEX_CMPXCHG if MMU && FUTEX
> select HAVE_MOD_ARCH_SPECIFIC
> select HAVE_UID16
> select MMU_GATHER_NO_RANGE if MMU
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 77a088d0a7e9..037fea9fac14 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -84,7 +84,6 @@ config RISCV
> select HAVE_DMA_CONTIGUOUS if MMU
> select HAVE_EBPF_JIT if MMU
> select HAVE_FUNCTION_ERROR_INJECTION
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO if MMU && 64BIT
> select HAVE_IRQ_TIME_ACCOUNTING
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index f615c3f65f5a..1c9ecf619e04 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -164,7 +164,6 @@ config S390
> select HAVE_FUNCTION_ERROR_INJECTION
> select HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_TRACER
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO
> select HAVE_IOREMAP_PROT if PCI
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 6904f4bdbf00..93195d3368c0 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -34,7 +34,6 @@ config SUPERH
> select HAVE_FAST_GUP if MMU
> select HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_TRACER
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select HAVE_FTRACE_MCOUNT_RECORD
> select HAVE_HW_BREAKPOINT
> select HAVE_IOREMAP_PROT if MMU && !X2TLB
> diff --git a/arch/um/Kconfig b/arch/um/Kconfig
> index c18b45f75d41..c906250d4970 100644
> --- a/arch/um/Kconfig
> +++ b/arch/um/Kconfig
> @@ -14,7 +14,6 @@ config UML
> select HAVE_ARCH_SECCOMP_FILTER
> select HAVE_ASM_MODVERSIONS
> select HAVE_UID16
> - select HAVE_FUTEX_CMPXCHG if FUTEX
> select HAVE_DEBUG_KMEMLEAK
> select HAVE_DEBUG_BUGVERBOSE
> select NO_DMA if !UML_DMA_EMULATION
> diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
> index a509be911026..9e37a7c05990 100644
> --- a/arch/um/kernel/skas/uaccess.c
> +++ b/arch/um/kernel/skas/uaccess.c
> @@ -348,7 +348,6 @@ EXPORT_SYMBOL(arch_futex_atomic_op_inuser);
> * 0 - On success
> * -EFAULT - User access resulted in a page fault
> * -EAGAIN - Atomic operation was unable to complete due to contention
> - * -ENOSYS - Function not implemented (only if !HAVE_FUTEX_CMPXCHG)
> */
>
> int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
> diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
> index 0e56bad058fa..8ac599aa6d99 100644
> --- a/arch/xtensa/Kconfig
> +++ b/arch/xtensa/Kconfig
> @@ -31,7 +31,6 @@ config XTENSA
> select HAVE_DMA_CONTIGUOUS
> select HAVE_EXIT_THREAD
> select HAVE_FUNCTION_TRACER
> - select HAVE_FUTEX_CMPXCHG if !MMU && FUTEX
> select HAVE_HW_BREAKPOINT if PERF_EVENTS
> select HAVE_IRQ_TIME_ACCOUNTING
> select HAVE_PCI
> diff --git a/init/Kconfig b/init/Kconfig
> index c0f55ea5a71f..538688598f2f 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1597,14 +1597,6 @@ config FUTEX_PI
> depends on FUTEX && RT_MUTEXES
> default y
>
> -config HAVE_FUTEX_CMPXCHG
> - bool
> - depends on FUTEX
> - help
> - Architectures should select this if futex_atomic_cmpxchg_inatomic()
> - is implemented and always working. This removes a couple of runtime
> - checks.
> -
> config EPOLL
> bool "Enable eventpoll support" if EXPERT
> default y
> diff --git a/kernel/futex/core.c b/kernel/futex/core.c
> index 25d8a88b32e5..926c2bb752bc 100644
> --- a/kernel/futex/core.c
> +++ b/kernel/futex/core.c
> @@ -41,11 +41,6 @@
> #include "futex.h"
> #include "../locking/rtmutex_common.h"
>
> -#ifndef CONFIG_HAVE_FUTEX_CMPXCHG
> -int __read_mostly futex_cmpxchg_enabled;
> -#endif
> -
> -
> /*
> * The base of the bucket array and its size are always used together
> * (after initialization only in futex_hash()), so ensure that they
> @@ -776,9 +771,6 @@ static void exit_robust_list(struct task_struct *curr)
> unsigned long futex_offset;
> int rc;
>
> - if (!futex_cmpxchg_enabled)
> - return;
> -
> /*
> * Fetch the list head (which was registered earlier, via
> * sys_set_robust_list()):
> @@ -874,9 +866,6 @@ static void compat_exit_robust_list(struct task_struct *curr)
> compat_long_t futex_offset;
> int rc;
>
> - if (!futex_cmpxchg_enabled)
> - return;
> -
> /*
> * Fetch the list head (which was registered earlier, via
> * sys_set_robust_list()):
> @@ -950,8 +939,6 @@ static void exit_pi_state_list(struct task_struct *curr)
> struct futex_hash_bucket *hb;
> union futex_key key = FUTEX_KEY_INIT;
>
> - if (!futex_cmpxchg_enabled)
> - return;
> /*
> * We are a ZOMBIE and nobody can enqueue itself on
> * pi_state_list anymore, but we have to be careful
> @@ -1125,26 +1112,6 @@ void futex_exit_release(struct task_struct *tsk)
> futex_cleanup_end(tsk, FUTEX_STATE_DEAD);
> }
>
> -static void __init futex_detect_cmpxchg(void)
> -{
> -#ifndef CONFIG_HAVE_FUTEX_CMPXCHG
> - u32 curval;
> -
> - /*
> - * This will fail and we want it. Some arch implementations do
> - * runtime detection of the futex_atomic_cmpxchg_inatomic()
> - * functionality. We want to know that before we call in any
> - * of the complex code paths. Also we want to prevent
> - * registration of robust lists in that case. NULL is
> - * guaranteed to fault and we get -EFAULT on functional
> - * implementation, the non-functional ones will return
> - * -ENOSYS.
> - */
> - if (futex_cmpxchg_value_locked(&curval, NULL, 0, 0) == -EFAULT)
> - futex_cmpxchg_enabled = 1;
> -#endif
> -}
> -
> static int __init futex_init(void)
> {
> unsigned int futex_shift;
> @@ -1163,8 +1130,6 @@ static int __init futex_init(void)
> futex_hashsize, futex_hashsize);
> futex_hashsize = 1UL << futex_shift;
>
> - futex_detect_cmpxchg();
> -
> for (i = 0; i < futex_hashsize; i++) {
> atomic_set(&futex_queues[i].waiters, 0);
> plist_head_init(&futex_queues[i].chain);
> diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
> index 040ae4277cb0..c264cbeab71c 100644
> --- a/kernel/futex/futex.h
> +++ b/kernel/futex/futex.h
> @@ -27,12 +27,6 @@
> #define FLAGS_CLOCKRT 0x02
> #define FLAGS_HAS_TIMEOUT 0x04
>
> -#ifdef CONFIG_HAVE_FUTEX_CMPXCHG
> -#define futex_cmpxchg_enabled 1
> -#else
> -extern int __read_mostly futex_cmpxchg_enabled;
> -#endif
> -
> #ifdef CONFIG_FAIL_FUTEX
> extern bool should_fail_futex(bool fshared);
> #else
> diff --git a/kernel/futex/syscalls.c b/kernel/futex/syscalls.c
> index 6f91a07a6a83..086a22d1adb7 100644
> --- a/kernel/futex/syscalls.c
> +++ b/kernel/futex/syscalls.c
> @@ -29,8 +29,6 @@
> SYSCALL_DEFINE2(set_robust_list, struct robust_list_head __user *, head,
> size_t, len)
> {
> - if (!futex_cmpxchg_enabled)
> - return -ENOSYS;
> /*
> * The kernel knows only one size for now:
> */
> @@ -56,9 +54,6 @@ SYSCALL_DEFINE3(get_robust_list, int, pid,
> unsigned long ret;
> struct task_struct *p;
>
> - if (!futex_cmpxchg_enabled)
> - return -ENOSYS;
> -
> rcu_read_lock();
>
> ret = -ESRCH;
> @@ -103,17 +98,6 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
> return -ENOSYS;
> }
>
> - switch (cmd) {
> - case FUTEX_LOCK_PI:
> - case FUTEX_LOCK_PI2:
> - case FUTEX_UNLOCK_PI:
> - case FUTEX_TRYLOCK_PI:
> - case FUTEX_WAIT_REQUEUE_PI:
> - case FUTEX_CMP_REQUEUE_PI:
> - if (!futex_cmpxchg_enabled)
> - return -ENOSYS;
> - }
> -
> switch (cmd) {
> case FUTEX_WAIT:
> val3 = FUTEX_BITSET_MATCH_ANY;
> @@ -323,9 +307,6 @@ COMPAT_SYSCALL_DEFINE2(set_robust_list,
> struct compat_robust_list_head __user *, head,
> compat_size_t, len)
> {
> - if (!futex_cmpxchg_enabled)
> - return -ENOSYS;
> -
> if (unlikely(len != sizeof(*head)))
> return -EINVAL;
>
> @@ -342,9 +323,6 @@ COMPAT_SYSCALL_DEFINE3(get_robust_list, int, pid,
> unsigned long ret;
> struct task_struct *p;
>
> - if (!futex_cmpxchg_enabled)
> - return -ENOSYS;
> -
> rcu_read_lock();
>
> ret = -ESRCH;
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 2/2] futex: remove futex_cmpxchg detection
2021-10-26 10:03 ` [PATCH 2/2] futex: remove futex_cmpxchg detection Arnd Bergmann
` (2 preceding siblings ...)
2021-10-26 10:43 ` Christian Borntraeger
@ 2021-10-26 12:30 ` Max Filippov
2021-10-26 20:26 ` Rich Felker
4 siblings, 0 replies; 6+ messages in thread
From: Max Filippov @ 2021-10-26 12:30 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Peter Zijlstra, Thomas Gleixner, Ingo Molnar, Arnd Bergmann,
Vineet Gupta, Russell King, Catalin Marinas, Will Deacon,
Guo Ren, Geert Uytterhoeven, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Heiko Carstens, Vasily Gorbik, Christian Borntraeger,
Alexander Gordeev, Yoshinori Sato, Rich Felker, Jeff Dike,
Richard Weinberger, Anton Ivanov, Chris Zankel, Darren Hart,
Davidlohr Bueso, André Almeida, Andrew Morton,
Mike Rapoport, Mark Rutland, Anshuman Khandual, linux-snps-arc,
LKML, linux-arm-kernel, linux-csky, open list:M68K ARCHITECTURE,
linux-riscv, linux-s390, open list:SUPERH, linux-um,
open list:TENSILICA XTENSA PORT (xtensa)
On Tue, Oct 26, 2021 at 3:06 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> Now that all architectures have a working futex implementation
> in any configuration, remove the runtime detection code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> arch/arc/Kconfig | 1 -
> arch/arm/Kconfig | 1 -
> arch/arm64/Kconfig | 1 -
> arch/csky/Kconfig | 1 -
> arch/m68k/Kconfig | 1 -
> arch/riscv/Kconfig | 1 -
> arch/s390/Kconfig | 1 -
> arch/sh/Kconfig | 1 -
> arch/um/Kconfig | 1 -
> arch/um/kernel/skas/uaccess.c | 1 -
> arch/xtensa/Kconfig | 1 -
> init/Kconfig | 8 --------
> kernel/futex/core.c | 35 -----------------------------------
> kernel/futex/futex.h | 6 ------
> kernel/futex/syscalls.c | 22 ----------------------
> 15 files changed, 82 deletions(-)
For xtensa:
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
--
Thanks.
-- Max
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 2/2] futex: remove futex_cmpxchg detection
2021-10-26 10:03 ` [PATCH 2/2] futex: remove futex_cmpxchg detection Arnd Bergmann
` (3 preceding siblings ...)
2021-10-26 12:30 ` Max Filippov
@ 2021-10-26 20:26 ` Rich Felker
4 siblings, 0 replies; 6+ messages in thread
From: Rich Felker @ 2021-10-26 20:26 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Peter Zijlstra, Thomas Gleixner, Ingo Molnar, Arnd Bergmann,
Vineet Gupta, Russell King, Catalin Marinas, Will Deacon,
Guo Ren, Geert Uytterhoeven, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Heiko Carstens, Vasily Gorbik, Christian Borntraeger,
Alexander Gordeev, Yoshinori Sato, Jeff Dike, Richard Weinberger,
Anton Ivanov, Chris Zankel, Max Filippov, Darren Hart,
Davidlohr Bueso, André Almeida, Andrew Morton,
Mike Rapoport, Mark Rutland, Anshuman Khandual, linux-snps-arc,
linux-kernel, linux-arm-kernel, linux-csky, linux-m68k,
linux-riscv, linux-s390, linux-sh, linux-um, linux-xtensa
On Tue, Oct 26, 2021 at 12:03:48PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Now that all architectures have a working futex implementation
> in any configuration, remove the runtime detection code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> arch/arc/Kconfig | 1 -
> arch/arm/Kconfig | 1 -
> arch/arm64/Kconfig | 1 -
> arch/csky/Kconfig | 1 -
> arch/m68k/Kconfig | 1 -
> arch/riscv/Kconfig | 1 -
> arch/s390/Kconfig | 1 -
> arch/sh/Kconfig | 1 -
> arch/um/Kconfig | 1 -
> arch/um/kernel/skas/uaccess.c | 1 -
> arch/xtensa/Kconfig | 1 -
> init/Kconfig | 8 --------
> kernel/futex/core.c | 35 -----------------------------------
> kernel/futex/futex.h | 6 ------
> kernel/futex/syscalls.c | 22 ----------------------
> 15 files changed, 82 deletions(-)
Acked-by: Rich Felker <dalias@libc.org>
^ permalink raw reply [flat|nested] 6+ messages in thread