mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 15:26:21 +09:00
Revert "parisc: Drop LDCW barrier in CAS code when running UP"
commit 462fb756c7de1ffe5bc6099149136031c2d9c02a upstream.
This reverts commit e6eb5fe912
.
We need to optimize it differently. A follow up patch will correct it.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v5.2+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
15f7b18691
commit
7612ce180e
|
@ -641,8 +641,7 @@ cas_action:
|
|||
2: stw %r24, 0(%r26)
|
||||
/* Free lock */
|
||||
#ifdef CONFIG_SMP
|
||||
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
|
||||
LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
#endif
|
||||
stw %r20, 0(%sr2,%r20)
|
||||
#if ENABLE_LWS_DEBUG
|
||||
|
@ -659,8 +658,7 @@ cas_action:
|
|||
/* Error occurred on load or store */
|
||||
/* Free lock */
|
||||
#ifdef CONFIG_SMP
|
||||
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
|
||||
LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
#endif
|
||||
stw %r20, 0(%sr2,%r20)
|
||||
#if ENABLE_LWS_DEBUG
|
||||
|
@ -864,8 +862,7 @@ cas2_action:
|
|||
cas2_end:
|
||||
/* Free lock */
|
||||
#ifdef CONFIG_SMP
|
||||
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
|
||||
LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
#endif
|
||||
stw %r20, 0(%sr2,%r20)
|
||||
/* Enable interrupts */
|
||||
|
@ -878,8 +875,7 @@ cas2_end:
|
|||
/* Error occurred on load or store */
|
||||
/* Free lock */
|
||||
#ifdef CONFIG_SMP
|
||||
98: LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP)
|
||||
LDCW 0(%sr2,%r20), %r1 /* Barrier */
|
||||
#endif
|
||||
stw %r20, 0(%sr2,%r20)
|
||||
ssm PSW_SM_I, %r0
|
||||
|
|
Loading…
Reference in New Issue
Block a user