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Revert "MIPS: futex: Emit Loongson3 sync workarounds within asm"

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This reverts commit d754a529a8be55f009c6679d772c472c1632cd5b which was
commit 3c1d3f0979721a39dd2980c97466127ce65aa130 upstream.

This breaks the build and should be reverted.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-12-31 18:08:46 +01:00
parent 03ad5d55be
commit ffe485232d
2 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/mips/include/asm/barrier.h
View File

@ -218,14 +218,13 @@
* ordering will be done by smp_llsc_mb() and friends.
*/
#if defined(CONFIG_WEAK_REORDERING_BEYOND_LLSC) && defined(CONFIG_SMP)
# define __WEAK_LLSC_MB sync
# define smp_llsc_mb() \
__asm__ __volatile__(__stringify(__WEAK_LLSC_MB) : : :"memory")
# define __LLSC_CLOBBER
#define __WEAK_LLSC_MB " sync \n"
#define smp_llsc_mb() __asm__ __volatile__(__WEAK_LLSC_MB : : :"memory")
#define __LLSC_CLOBBER
#else
# define __WEAK_LLSC_MB
# define smp_llsc_mb() do { } while (0)
# define __LLSC_CLOBBER "memory"
#define __WEAK_LLSC_MB " \n"
#define smp_llsc_mb() do { } while (0)
#define __LLSC_CLOBBER "memory"
#endif
#ifdef CONFIG_CPU_CAVIUM_OCTEON

15
arch/mips/include/asm/futex.h
View File

@ -16,7 +16,6 @@
#include <asm/barrier.h>
#include <asm/compiler.h>
#include <asm/errno.h>
#include <asm/sync.h>
#include <asm/war.h>
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
@ -33,7 +32,7 @@
" .set arch=r4000 \n" \
"2: sc $1, %2 \n" \
" beqzl $1, 1b \n" \
__stringify(__WEAK_LLSC_MB) \
__WEAK_LLSC_MB \
"3: \n" \
" .insn \n" \
" .set pop \n" \
@ -51,19 +50,19 @@
"i" (-EFAULT) \
: "memory"); \
} else if (cpu_has_llsc) { \
loongson_llsc_mb(); \
__asm__ __volatile__( \
" .set push \n" \
" .set noat \n" \
" .set push \n" \
" .set "MIPS_ISA_ARCH_LEVEL" \n" \
" " __SYNC(full, loongson3_war) " \n" \
"1: "user_ll("%1", "%4")" # __futex_atomic_op\n" \
" .set pop \n" \
" " insn " \n" \
" .set "MIPS_ISA_ARCH_LEVEL" \n" \
"2: "user_sc("$1", "%2")" \n" \
" beqz $1, 1b \n" \
__stringify(__WEAK_LLSC_MB) \
__WEAK_LLSC_MB \
"3: \n" \
" .insn \n" \
" .set pop \n" \
@ -148,7 +147,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
" .set arch=r4000 \n"
"2: sc $1, %2 \n"
" beqzl $1, 1b \n"
__stringify(__WEAK_LLSC_MB)
__WEAK_LLSC_MB
"3: \n"
" .insn \n"
" .set pop \n"
@ -165,13 +164,13 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
"i" (-EFAULT)
: "memory");
} else if (cpu_has_llsc) {
loongson_llsc_mb();
__asm__ __volatile__(
"# futex_atomic_cmpxchg_inatomic \n"
" .set push \n"
" .set noat \n"
" .set push \n"
" .set "MIPS_ISA_ARCH_LEVEL" \n"
" " __SYNC(full, loongson3_war) " \n"
"1: "user_ll("%1", "%3")" \n"
" bne %1, %z4, 3f \n"
" .set pop \n"
@ -179,7 +178,8 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
" .set "MIPS_ISA_ARCH_LEVEL" \n"
"2: "user_sc("$1", "%2")" \n"
" beqz $1, 1b \n"
"3: " __SYNC_ELSE(full, loongson3_war, __WEAK_LLSC_MB) "\n"
__WEAK_LLSC_MB
"3: \n"
" .insn \n"
" .set pop \n"
" .section .fixup,\"ax\" \n"
@ -194,6 +194,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
: GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
"i" (-EFAULT)
: "memory");
loongson_llsc_mb();
} else
return -ENOSYS;