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| author | Breno Leitao <leitao@debian.org> | 2026-08-05 07:52:36 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-08-10 11:47:20 -1000 |
| commit | a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 (patch) | |
| tree | 39f5b258386e1127d253d293194e9a2991bf3c34 /arch/sparc/lib/locks.S | |
| download | linux-stable-a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656.tar.gz linux-stable-a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656.zip | |
workqueue: skip the node_nr_active update for non-unbound workqueuesgrafted
apply_wqattrs_commit() updates node_nr_active->max unconditionally.
wq->node_nr_active[] is only allocated for unbound workqueues, so guard
the call before per-cpu workqueues start using this path.
No functional change: only unbound workqueues reach apply_wqattrs_*()
today.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'arch/sparc/lib/locks.S')
| -rw-r--r-- | arch/sparc/lib/locks.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/sparc/lib/locks.S b/arch/sparc/lib/locks.S new file mode 100644 index 000000000..47a39f438 --- /dev/null +++ b/arch/sparc/lib/locks.S @@ -0,0 +1,98 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * locks.S: SMP low-level lock primitives on Sparc. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1998 Anton Blanchard (anton@progsoc.uts.edu.au) + * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) + */ + +#include <linux/export.h> +#include <asm/ptrace.h> +#include <asm/psr.h> +#include <asm/smp.h> +#include <asm/spinlock.h> + + .text + .align 4 + + /* Read/writer locks, as usual this is overly clever to make it + * as fast as possible. + */ + + /* caches... */ +___rw_read_enter_spin_on_wlock: + orcc %g2, 0x0, %g0 + be,a ___rw_read_enter + ldstub [%g1 + 3], %g2 + b ___rw_read_enter_spin_on_wlock + ldub [%g1 + 3], %g2 +___rw_read_try_spin_on_wlock: + andcc %g2, 0xff, %g0 + be,a ___rw_read_try + ldstub [%g1 + 3], %g2 + xnorcc %g2, 0x0, %o0 /* if g2 is ~0, set o0 to 0 and bugger off */ + bne,a ___rw_read_enter_spin_on_wlock + ld [%g1], %g2 + retl + mov %g4, %o7 +___rw_read_exit_spin_on_wlock: + orcc %g2, 0x0, %g0 + be,a ___rw_read_exit + ldstub [%g1 + 3], %g2 + b ___rw_read_exit_spin_on_wlock + ldub [%g1 + 3], %g2 +___rw_write_enter_spin_on_wlock: + orcc %g2, 0x0, %g0 + be,a ___rw_write_enter + ldstub [%g1 + 3], %g2 + b ___rw_write_enter_spin_on_wlock + ld [%g1], %g2 + + .globl ___rw_read_enter +EXPORT_SYMBOL(___rw_read_enter) +___rw_read_enter: + orcc %g2, 0x0, %g0 + bne,a ___rw_read_enter_spin_on_wlock + ldub [%g1 + 3], %g2 + ld [%g1], %g2 + add %g2, 1, %g2 + st %g2, [%g1] + retl + mov %g4, %o7 + + .globl ___rw_read_exit +EXPORT_SYMBOL(___rw_read_exit) +___rw_read_exit: + orcc %g2, 0x0, %g0 + bne,a ___rw_read_exit_spin_on_wlock + ldub [%g1 + 3], %g2 + ld [%g1], %g2 + sub %g2, 0x1ff, %g2 + st %g2, [%g1] + retl + mov %g4, %o7 + + .globl ___rw_read_try +EXPORT_SYMBOL(___rw_read_try) +___rw_read_try: + orcc %g2, 0x0, %g0 + bne ___rw_read_try_spin_on_wlock + ld [%g1], %g2 + add %g2, 1, %g2 + st %g2, [%g1] + set 1, %o1 + retl + mov %g4, %o7 + + .globl ___rw_write_enter +EXPORT_SYMBOL(___rw_write_enter) +___rw_write_enter: + orcc %g2, 0x0, %g0 + bne ___rw_write_enter_spin_on_wlock + ld [%g1], %g2 + andncc %g2, 0xff, %g0 + bne,a ___rw_write_enter_spin_on_wlock + stb %g0, [%g1 + 3] + retl + mov %g4, %o7 |