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Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
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This patch optimizes both __lll_lock_wait_private and __lll_lock_wait
by issuing only one lll_futex_wait. Since it is defined as an inlined
syscall and inlined syscalls are defined using inlined assembly the
compiler usually can not see both calls are equal and optimize
accordingly.
On aarch64 the resulting binary is change from:
0000000000000060 <__lll_lock_wait>:
60: 2a0103e5 mov w5, w1
64: b9400001 ldr w1, [x0]
68: aa0003e4 mov x4, x0
6c: 7100083f cmp w1, #0x2
70: 540000e1 b.ne 8c <__lll_lock_wait+0x2c> // b.any
74: 521900a1 eor w1, w5, #0x80
78: d2800042 mov x2, #0x2 // #2
7c: 93407c21 sxtw x1, w1
80: d2800003 mov x3, #0x0 // #0
84: d2800c48 mov x8, #0x62 // #98
88: d4000001 svc #0x0
8c: 521900a5 eor w5, w5, #0x80
90: 52800046 mov w6, #0x2 // #2
94: 93407ca5 sxtw x5, w5
98: 14000008 b b8 <__lll_lock_wait+0x58>
9c: d503201f nop
a0: aa0403e0 mov x0, x4
a4: aa0503e1 mov x1, x5
a8: d2800042 mov x2, #0x2 // #2
ac: d2800003 mov x3, #0x0 // #0
b0: d2800c48 mov x8, #0x62 // #98
b4: d4000001 svc #0x0
b8: 885ffc80 ldaxr w0, [x4]
bc: 88017c86 stxr w1, w6, [x4]
c0: 35ffffc1 cbnz w1, b8 <__lll_lock_wait+0x58>
c4: 35fffee0 cbnz w0, a0 <__lll_lock_wait+0x40>
c8: d65f03c0 ret
To:
0000000000000048 <__lll_lock_wait>:
48: aa0003e4 mov x4, x0
4c: 2a0103e5 mov w5, w1
50: b9400000 ldr w0, [x0]
54: 7100081f cmp w0, #0x2
58: 540000c0 b.eq 70 <__lll_lock_wait+0x28> // b.none
5c: 52800041 mov w1, #0x2 // #2
60: 885ffc80 ldaxr w0, [x4]
64: 88027c81 stxr w2, w1, [x4]
68: 35ffffc2 cbnz w2, 60 <__lll_lock_wait+0x18>
6c: 34000120 cbz w0, 90 <__lll_lock_wait+0x48>
70: 521900a1 eor w1, w5, #0x80
74: aa0403e0 mov x0, x4
78: 93407c21 sxtw x1, w1
7c: d2800042 mov x2, #0x2 // #2
80: d2800003 mov x3, #0x0 // #0
84: d2800c48 mov x8, #0x62 // #98
88: d4000001 svc #0x0
8c: 17fffff4 b 5c <__lll_lock_wait+0x14>
90: d65f03c0 ret
I see similar changes on powerpc and other architectures. It also aligns
with x86_64 implementation by adding the systemtap probes.
Checker on aarch64-linux-gnu.
* nptl/lowlevellock.c (__lll_lock_wait, __lll_lock_wait_private):
Optimize futex call and add systemtap probe.
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