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x86, 386 removal: Remove CONFIG_XADD

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All 486+ CPUs support XADD, so remove the fallback 386 support
code.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1354132230-21854-4-git-send-email-hpa@linux.intel.com
This commit is contained in:
H. Peter Anvin 2012-11-28 11:50:25 -08:00
parent d55c5a93db
commit 7ac468b130
5 changed files with 2 additions and 42 deletions
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5
arch/x86/Kconfig
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@ -171,13 +171,8 @@ config ARCH_MAY_HAVE_PC_FDC
def_bool y
depends on ISA_DMA_API
config RWSEM_GENERIC_SPINLOCK
def_bool y
depends on !X86_XADD
config RWSEM_XCHGADD_ALGORITHM
def_bool y
depends on X86_XADD
config GENERIC_CALIBRATE_DELAY
def_bool y

3
arch/x86/Kconfig.cpu
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@ -304,9 +304,6 @@ config X86_L1_CACHE_SHIFT
default "4" if MELAN || M486 || MGEODEGX1
default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
config X86_XADD
def_bool y
config X86_PPRO_FENCE
bool "PentiumPro memory ordering errata workaround"
depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1

16
arch/x86/include/asm/atomic.h
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@ -172,23 +172,7 @@ static inline int atomic_add_negative(int i, atomic_t *v)
*/
static inline int atomic_add_return(int i, atomic_t *v)
{
#ifdef CONFIG_M386
int __i;
unsigned long flags;
if (unlikely(boot_cpu_data.x86 <= 3))
goto no_xadd;
#endif
/* Modern 486+ processor */
return i + xadd(&v->counter, i);
#ifdef CONFIG_M386
no_xadd: /* Legacy 386 processor */
raw_local_irq_save(flags);
__i = atomic_read(v);
atomic_set(v, i + __i);
raw_local_irq_restore(flags);
return i + __i;
#endif
}
/**

18
arch/x86/include/asm/local.h
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@ -124,27 +124,11 @@ static inline int local_add_negative(long i, local_t *l)
*/
static inline long local_add_return(long i, local_t *l)
{
long __i;
#ifdef CONFIG_M386
unsigned long flags;
if (unlikely(boot_cpu_data.x86 <= 3))
goto no_xadd;
#endif
/* Modern 486+ processor */
__i = i;
long __i = i;
asm volatile(_ASM_XADD "%0, %1;"
: "+r" (i), "+m" (l->a.counter)
: : "memory");
return i + __i;
#ifdef CONFIG_M386
no_xadd: /* Legacy 386 processor */
local_irq_save(flags);
__i = local_read(l);
local_set(l, i + __i);
local_irq_restore(flags);
return i + __i;
#endif
}
static inline long local_sub_return(long i, local_t *l)

2
arch/x86/um/Kconfig
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@ -31,7 +31,7 @@ config X86_64
select MODULES_USE_ELF_RELA
config RWSEM_XCHGADD_ALGORITHM
def_bool X86_XADD && 64BIT
def_bool 64BIT
config RWSEM_GENERIC_SPINLOCK
def_bool !RWSEM_XCHGADD_ALGORITHM