nptl: Assume __ASSUME_FUTEX_CLOCK_REALTIME support

This patch assumes realtime clock support for nptl and thus removes
all the associated code.

For __pthread_mutex_timedlock the fallback usage for the case where
lll_futex_timed_wait_bitset it not set define is also removed. The
generic lowlevellock-futex.h always define it, so for NPTL code the
check always yield true.

Checked on x86_64-linux-gnu and i686-linux-gnu.

	* nptl/nptl-init.c (__have_futex_clock_realtime,
	__have_futex_clock_realtime): Remove definition.
	(__pthread_initialize_minimal_internal): Remove FUTEX_CLOCK_REALTIME
	check test for !__ASSUME_FUTEX_CLOCK_REALTIME.
	* nptl/pthread_mutex_timedlock.c (__pthread_mutex_timedlock): Assume
	__ASSUME_FUTEX_CLOCK_REALTIME support.
	* sysdeps/unix/sysv/linux/i386/lowlevellock.S: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Likewise.
	* sysdeps/unix/sysv/linux/kernel-features.h
	(__ASSUME_FUTEX_CLOCK_REALTIME): Remove.
	* sysdeps/nptl/lowlevellock-futex.h (lll_futex_timed_wait_bitset):
	Adjust comment.

4 files changed, 1 insertions, 220 deletions

diff --git a/sysdeps/nptl/lowlevellock-futex.h b/sysdeps/nptl/lowlevellock-futex.h
index bb8effe288..63d917d8da 100644
--- a/sysdeps/nptl/lowlevellock-futex.h
+++ b/sysdeps/nptl/lowlevellock-futex.h
@@ -43,8 +43,7 @@
 #define lll_futex_timed_wait(futexp, val, timeout, private)             \
   -ENOSYS
 
-/* This macro should be defined only if FUTEX_CLOCK_REALTIME is also defined.
-   If CLOCKBIT is zero, this is identical to lll_futex_timed_wait.
+/* If CLOCKBIT is zero, this is identical to lll_futex_timed_wait.
    If CLOCKBIT has FUTEX_CLOCK_REALTIME set, then it's the same but
    TIMEOUT is counted by CLOCK_REALTIME rather than CLOCK_MONOTONIC.  */
 #define lll_futex_timed_wait_bitset(futexp, val, timeout, clockbit, private) \
diff --git a/sysdeps/unix/sysv/linux/i386/lowlevellock.S b/sysdeps/unix/sysv/linux/i386/lowlevellock.S
index 83191a3899..a9898e94fd 100644
--- a/sysdeps/unix/sysv/linux/i386/lowlevellock.S
+++ b/sysdeps/unix/sysv/linux/i386/lowlevellock.S
@@ -148,16 +148,6 @@ __lll_timedlock_wait:
 	cfi_adjust_cfa_offset(4)
 	cfi_rel_offset(%ebx, 0)
 
-# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
-#  ifdef PIC
-	LOAD_PIC_REG (bx)
-	cmpl	$0, __have_futex_clock_realtime@GOTOFF(%ebx)
-#  else
-	cmpl	$0, __have_futex_clock_realtime
-#  endif
-	je	.Lreltmo
-# endif
-
 	cmpl	$0, (%edx)
 	js	8f
 
@@ -199,96 +189,6 @@ __lll_timedlock_wait:
 8:	movl	$ETIMEDOUT, %eax
 	jmp	7b
 
-# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
-.Lreltmo:
-	/* Check for a valid timeout value.  */
-	cmpl	$1000000000, 4(%edx)
-	jae	3f
-
-	pushl	%esi
-	cfi_adjust_cfa_offset(4)
-	cfi_rel_offset(%esi, 0)
-	pushl	%edi
-	cfi_adjust_cfa_offset(4)
-	cfi_rel_offset(%edi, 0)
-
-	/* Stack frame for the timespec and timeval structs.  */
-	subl	$8, %esp
-	cfi_adjust_cfa_offset(8)
-
-	movl	%ecx, %ebp
-	movl	%edx, %edi
-
-	movl	$2, %edx
-	xchgl	%edx, (%ebp)
-
-	test	%edx, %edx
-	je	6f
-
-1:
-	/* Get current time.  */
-	movl	%esp, %ebx
-	xorl	%ecx, %ecx
-	movl	$__NR_gettimeofday, %eax
-	ENTER_KERNEL
-
-	/* Compute relative timeout.  */
-	movl	4(%esp), %eax
-	movl	$1000, %edx
-	mul	%edx		/* Milli seconds to nano seconds.  */
-	movl	(%edi), %ecx
-	movl	4(%edi), %edx
-	subl	(%esp), %ecx
-	subl	%eax, %edx
-	jns	4f
-	addl	$1000000000, %edx
-	subl	$1, %ecx
-4:	testl	%ecx, %ecx
-	js	2f		/* Time is already up.  */
-
-	/* Store relative timeout.  */
-	movl	%ecx, (%esp)
-	movl	%edx, 4(%esp)
-
-	/* Futex call.  */
-	movl	%ebp, %ebx
-	movl	$2, %edx
-	movl	%esp, %esi
-	movl	16(%esp), %ecx
-	LOAD_FUTEX_WAIT (%ecx)
-	movl	$SYS_futex, %eax
-	ENTER_KERNEL
-
-	/* NB: %edx == 2 */
-	xchgl	%edx, (%ebp)
-
-	testl	%edx, %edx
-	je	6f
-
-	cmpl	$-ETIMEDOUT, %eax
-	jne	1b
-2:	movl	$ETIMEDOUT, %edx
-
-6:	addl	$8, %esp
-	cfi_adjust_cfa_offset(-8)
-	popl	%edi
-	cfi_adjust_cfa_offset(-4)
-	cfi_restore(%edi)
-	popl	%esi
-	cfi_adjust_cfa_offset(-4)
-	cfi_restore(%esi)
-7:	popl	%ebx
-	cfi_adjust_cfa_offset(-4)
-	cfi_restore(%ebx)
-	popl	%ebp
-	cfi_adjust_cfa_offset(-4)
-	cfi_restore(%ebp)
-	movl	%edx, %eax
-	ret
-
-3:	movl	$EINVAL, %edx
-	jmp	7b
-# endif
 	cfi_endproc
 	.size	__lll_timedlock_wait,.-__lll_timedlock_wait
 #endif
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 0db1b987a4..bc5c959f58 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -57,9 +57,6 @@
    2.6.27.  */
 #define __ASSUME_IN_NONBLOCK	1
 
-/* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29.  */
-#define __ASSUME_FUTEX_CLOCK_REALTIME	1
-
 /* Support for preadv and pwritev was added in 2.6.30.  */
 #define __ASSUME_PREADV	1
 #define __ASSUME_PWRITEV	1
diff --git a/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S b/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
index 166dbcfd3b..00ba88d5d2 100644
--- a/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
+++ b/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
@@ -127,15 +127,6 @@ __lll_lock_wait:
 	.align	16
 __lll_timedlock_wait:
 	cfi_startproc
-# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
-#  ifdef PIC
-	cmpl	$0, __have_futex_clock_realtime(%rip)
-#  else
-	cmpl	$0, __have_futex_clock_realtime
-#  endif
-	je	.Lreltmo
-# endif
-
 	cmpq	$0, (%rdx)
 	js	5f
 
@@ -176,112 +167,6 @@ __lll_timedlock_wait:
 5:	movl	$ETIMEDOUT, %eax
 	retq
 
-# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
-.Lreltmo:
-	/* Check for a valid timeout value.  */
-	cmpq	$1000000000, 8(%rdx)
-	jae	3f
-
-	pushq	%r8
-	cfi_adjust_cfa_offset(8)
-	pushq	%r9
-	cfi_adjust_cfa_offset(8)
-	pushq	%r12
-	cfi_adjust_cfa_offset(8)
-	pushq	%r13
-	cfi_adjust_cfa_offset(8)
-	pushq	%r14
-	cfi_adjust_cfa_offset(8)
-	cfi_offset(%r8, -16)
-	cfi_offset(%r9, -24)
-	cfi_offset(%r12, -32)
-	cfi_offset(%r13, -40)
-	cfi_offset(%r14, -48)
-	pushq	%rsi
-	cfi_adjust_cfa_offset(8)
-
-	/* Stack frame for the timespec and timeval structs.  */
-	subq	$24, %rsp
-	cfi_adjust_cfa_offset(24)
-
-	movq	%rdi, %r12
-	movq	%rdx, %r13
-
-	movl	$2, %edx
-	xchgl	%edx, (%r12)
-
-	testl	%edx, %edx
-	je	6f
-
-1:
-	/* Get current time.  */
-	movq	%rsp, %rdi
-	xorl	%esi, %esi
-	/* This call works because we directly jump to a system call entry
-	   which preserves all the registers.  */
-	call	JUMPTARGET(__gettimeofday)
-
-	/* Compute relative timeout.  */
-	movq	8(%rsp), %rax
-	movl	$1000, %edi
-	mul	%rdi		/* Milli seconds to nano seconds.  */
-	movq	(%r13), %rdi
-	movq	8(%r13), %rsi
-	subq	(%rsp), %rdi
-	subq	%rax, %rsi
-	jns	4f
-	addq	$1000000000, %rsi
-	decq	%rdi
-4:	testq	%rdi, %rdi
-	js	2f		/* Time is already up.  */
-
-	/* Store relative timeout.  */
-	movq	%rdi, (%rsp)
-	movq	%rsi, 8(%rsp)
-
-	/* Futex call.  */
-	movl	$2, %edx
-	movl	$1, %eax
-	movq	%rsp, %r10
-	movl	24(%rsp), %esi
-	LOAD_FUTEX_WAIT (%esi)
-	movq	%r12, %rdi
-	movl	$SYS_futex, %eax
-	syscall
-
-	/* NB: %edx == 2 */
-	xchgl	%edx, (%r12)
-
-	testl	%edx, %edx
-	je	6f
-
-	cmpl	$-ETIMEDOUT, %eax
-	jne	1b
-2:	movl	$ETIMEDOUT, %edx
-
-6:	addq	$32, %rsp
-	cfi_adjust_cfa_offset(-32)
-	popq	%r14
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore(%r14)
-	popq	%r13
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore(%r13)
-	popq	%r12
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore(%r12)
-	popq	%r9
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore(%r9)
-	popq	%r8
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore(%r8)
-	movl	%edx, %eax
-	retq
-
-3:	movl	$EINVAL, %eax
-	retq
-# endif
 	cfi_endproc
 	.size	__lll_timedlock_wait,.-__lll_timedlock_wait
 #endif