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| author | Helge Deller <deller@gmx.de> | 2020-07-28 18:52:58 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2020-07-28 18:52:58 +0200 |
| commit | 462fb756c7de1ffe5bc6099149136031c2d9c02a (patch) | |
| tree | 3921123b79ed0b656169a87d31a4082acfc5e8f0 /arch/parisc | |
| parent | Revert "parisc: Improve interrupt handling in arch_spin_lock_flags()" (diff) | |
| download | linux-462fb756c7de1ffe5bc6099149136031c2d9c02a.tar.xz linux-462fb756c7de1ffe5bc6099149136031c2d9c02a.zip | |
Revert "parisc: Drop LDCW barrier in CAS code when running UP"
This reverts commit e6eb5fe9123f05dcbf339ae5c0b6d32fcc0685d5.
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+
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/kernel/syscall.S | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S index f05c9d5b6b9e..ea505a81f821 100644 --- a/arch/parisc/kernel/syscall.S +++ b/arch/parisc/kernel/syscall.S @@ -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 |