diff options
Diffstat (limited to 'arch/sparc')
25 files changed, 123 insertions, 107 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 84437a4c6545..8535e19062f6 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -32,6 +32,7 @@ config SPARC select GENERIC_IRQ_SHOW select ARCH_WANT_IPC_PARSE_VERSION select GENERIC_PCI_IOMAP + select HAS_IOPORT select HAVE_NMI_WATCHDOG if SPARC64 select HAVE_CBPF_JIT if SPARC32 select HAVE_EBPF_JIT if SPARC64 @@ -270,18 +271,17 @@ config ARCH_SPARSEMEM_DEFAULT def_bool y if SPARC64 config ARCH_FORCE_MAX_ORDER - int "Maximum zone order" - default "13" + int "Order of maximal physically contiguous allocations" + default "12" help - The kernel memory allocator divides physically contiguous memory - blocks into "zones", where each zone is a power of two number of - pages. This option selects the largest power of two that the kernel - keeps in the memory allocator. If you need to allocate very large - blocks of physically contiguous memory, then you may need to - increase this value. - - This config option is actually maximum order plus one. For example, - a value of 13 means that the largest free memory block is 2^12 pages. + The kernel page allocator limits the size of maximal physically + contiguous allocations. The limit is called MAX_ORDER and it + defines the maximal power of two of number of pages that can be + allocated as a single contiguous block. This option allows + overriding the default setting when ability to allocate very + large blocks of physically contiguous memory is required. + + Don't change if unsure. if SPARC64 || COMPILE_TEST source "kernel/power/Kconfig" diff --git a/arch/sparc/Makefile b/arch/sparc/Makefile index a4ea5b05f288..74be90529a18 100644 --- a/arch/sparc/Makefile +++ b/arch/sparc/Makefile @@ -83,18 +83,11 @@ vdso_install: KBUILD_IMAGE := $(boot)/zImage # Don't use tabs in echo arguments. -ifeq ($(ARCH),sparc) define archhelp - echo '* image - kernel image ($(boot)/image)' - echo '* zImage - stripped kernel image ($(boot)/zImage)' + echo '* vmlinux - standard SPARC kernel' + echo ' image - kernel image ($(boot)/image)' + echo '* zImage - stripped/compressed kernel image ($(boot)/zImage)' echo ' uImage - U-Boot SPARC32 Image (only for LEON)' + echo ' vmlinux.aout - a.out kernel for SPARC64' echo ' tftpboot.img - image prepared for tftp' endef -else -define archhelp - echo '* vmlinux - standard sparc64 kernel' - echo '* zImage - stripped and compressed sparc64 kernel ($(boot)/zImage)' - echo ' vmlinux.aout - a.out kernel for sparc64' - echo ' tftpboot.img - image prepared for tftp' -endef -endif diff --git a/arch/sparc/include/asm/cmpxchg_32.h b/arch/sparc/include/asm/cmpxchg_32.h index 27a57a3a7597..7a1339533d1d 100644 --- a/arch/sparc/include/asm/cmpxchg_32.h +++ b/arch/sparc/include/asm/cmpxchg_32.h @@ -15,7 +15,7 @@ unsigned long __xchg_u32(volatile u32 *m, u32 new); void __xchg_called_with_bad_pointer(void); -static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size) +static inline unsigned long __arch_xchg(unsigned long x, __volatile__ void * ptr, int size) { switch (size) { case 4: @@ -25,7 +25,7 @@ static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int return x; } -#define arch_xchg(ptr,x) ({(__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)));}) +#define arch_xchg(ptr,x) ({(__typeof__(*(ptr)))__arch_xchg((unsigned long)(x),(ptr),sizeof(*(ptr)));}) /* Emulate cmpxchg() the same way we emulate atomics, * by hashing the object address and indexing into an array diff --git a/arch/sparc/include/asm/cmpxchg_64.h b/arch/sparc/include/asm/cmpxchg_64.h index 12d00a42c0a3..66cd61dde9ec 100644 --- a/arch/sparc/include/asm/cmpxchg_64.h +++ b/arch/sparc/include/asm/cmpxchg_64.h @@ -55,7 +55,7 @@ static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long #define arch_xchg(ptr,x) \ ({ __typeof__(*(ptr)) __ret; \ __ret = (__typeof__(*(ptr))) \ - __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))); \ + __arch_xchg((unsigned long)(x), (ptr), sizeof(*(ptr))); \ __ret; \ }) @@ -87,8 +87,8 @@ xchg16(__volatile__ unsigned short *m, unsigned short val) return (load32 & mask) >> bit_shift; } -static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr, - int size) +static inline unsigned long +__arch_xchg(unsigned long x, __volatile__ void * ptr, int size) { switch (size) { case 2: diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h index 7a8380c63aab..799e797c5cdd 100644 --- a/arch/sparc/include/asm/mmu_context_64.h +++ b/arch/sparc/include/asm/mmu_context_64.h @@ -185,6 +185,12 @@ static inline void finish_arch_post_lock_switch(void) } } +#define mm_untag_mask mm_untag_mask +static inline unsigned long mm_untag_mask(struct mm_struct *mm) +{ + return -1UL >> adi_nbits(); +} + #include <asm-generic/mmu_context.h> #endif /* !(__ASSEMBLY__) */ diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 2dc8d4641734..5563efa1a19f 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -357,6 +357,42 @@ static inline pgprot_t pgprot_noncached(pgprot_t prot) */ #define pgprot_noncached pgprot_noncached +static inline unsigned long pte_dirty(pte_t pte) +{ + unsigned long mask; + + __asm__ __volatile__( + "\n661: mov %1, %0\n" + " nop\n" + " .section .sun4v_2insn_patch, \"ax\"\n" + " .word 661b\n" + " sethi %%uhi(%2), %0\n" + " sllx %0, 32, %0\n" + " .previous\n" + : "=r" (mask) + : "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V)); + + return (pte_val(pte) & mask); +} + +static inline unsigned long pte_write(pte_t pte) +{ + unsigned long mask; + + __asm__ __volatile__( + "\n661: mov %1, %0\n" + " nop\n" + " .section .sun4v_2insn_patch, \"ax\"\n" + " .word 661b\n" + " sethi %%uhi(%2), %0\n" + " sllx %0, 32, %0\n" + " .previous\n" + : "=r" (mask) + : "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V)); + + return (pte_val(pte) & mask); +} + #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE) pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags); #define arch_make_huge_pte arch_make_huge_pte @@ -418,28 +454,43 @@ static inline bool is_hugetlb_pte(pte_t pte) } #endif +static inline pte_t __pte_mkhwwrite(pte_t pte) +{ + unsigned long val = pte_val(pte); + + /* + * Note: we only want to set the HW writable bit if the SW writable bit + * and the SW dirty bit are set. + */ + __asm__ __volatile__( + "\n661: or %0, %2, %0\n" + " .section .sun4v_1insn_patch, \"ax\"\n" + " .word 661b\n" + " or %0, %3, %0\n" + " .previous\n" + : "=r" (val) + : "0" (val), "i" (_PAGE_W_4U), "i" (_PAGE_W_4V)); + + return __pte(val); +} + static inline pte_t pte_mkdirty(pte_t pte) { - unsigned long val = pte_val(pte), tmp; + unsigned long val = pte_val(pte), mask; __asm__ __volatile__( - "\n661: or %0, %3, %0\n" - " nop\n" - "\n662: nop\n" + "\n661: mov %1, %0\n" " nop\n" " .section .sun4v_2insn_patch, \"ax\"\n" " .word 661b\n" - " sethi %%uhi(%4), %1\n" - " sllx %1, 32, %1\n" - " .word 662b\n" - " or %1, %%lo(%4), %1\n" - " or %0, %1, %0\n" + " sethi %%uhi(%2), %0\n" + " sllx %0, 32, %0\n" " .previous\n" - : "=r" (val), "=r" (tmp) - : "0" (val), "i" (_PAGE_MODIFIED_4U | _PAGE_W_4U), - "i" (_PAGE_MODIFIED_4V | _PAGE_W_4V)); + : "=r" (mask) + : "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V)); - return __pte(val); + pte = __pte(val | mask); + return pte_write(pte) ? __pte_mkhwwrite(pte) : pte; } static inline pte_t pte_mkclean(pte_t pte) @@ -481,7 +532,8 @@ static inline pte_t pte_mkwrite(pte_t pte) : "=r" (mask) : "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V)); - return __pte(val | mask); + pte = __pte(val | mask); + return pte_dirty(pte) ? __pte_mkhwwrite(pte) : pte; } static inline pte_t pte_wrprotect(pte_t pte) @@ -584,42 +636,6 @@ static inline unsigned long pte_young(pte_t pte) return (pte_val(pte) & mask); } -static inline unsigned long pte_dirty(pte_t pte) -{ - unsigned long mask; - - __asm__ __volatile__( - "\n661: mov %1, %0\n" - " nop\n" - " .section .sun4v_2insn_patch, \"ax\"\n" - " .word 661b\n" - " sethi %%uhi(%2), %0\n" - " sllx %0, 32, %0\n" - " .previous\n" - : "=r" (mask) - : "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V)); - - return (pte_val(pte) & mask); -} - -static inline unsigned long pte_write(pte_t pte) -{ - unsigned long mask; - - __asm__ __volatile__( - "\n661: mov %1, %0\n" - " nop\n" - " .section .sun4v_2insn_patch, \"ax\"\n" - " .word 661b\n" - " sethi %%uhi(%2), %0\n" - " sllx %0, 32, %0\n" - " .previous\n" - : "=r" (mask) - : "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V)); - - return (pte_val(pte) & mask); -} - static inline unsigned long pte_exec(pte_t pte) { unsigned long mask; diff --git a/arch/sparc/include/asm/prom.h b/arch/sparc/include/asm/prom.h index 587edb8b5a65..8184575b1336 100644 --- a/arch/sparc/include/asm/prom.h +++ b/arch/sparc/include/asm/prom.h @@ -19,11 +19,14 @@ #include <linux/mutex.h> #include <linux/atomic.h> #include <linux/irqdomain.h> +#include <linux/spinlock.h> #define of_compat_cmp(s1, s2, l) strncmp((s1), (s2), (l)) #define of_prop_cmp(s1, s2) strcasecmp((s1), (s2)) #define of_node_cmp(s1, s2) strcmp((s1), (s2)) +extern raw_spinlock_t devtree_lock; + struct of_irq_controller { unsigned int (*irq_build)(struct device_node *, unsigned int, void *); void *data; diff --git a/arch/sparc/include/asm/smp_64.h b/arch/sparc/include/asm/smp_64.h index e75783b6abc4..505b6700805d 100644 --- a/arch/sparc/include/asm/smp_64.h +++ b/arch/sparc/include/asm/smp_64.h @@ -49,7 +49,7 @@ int hard_smp_processor_id(void); void smp_fill_in_cpu_possible_map(void); void smp_fill_in_sib_core_maps(void); -void cpu_play_dead(void); +void __noreturn cpu_play_dead(void); void smp_fetch_global_regs(void); void smp_fetch_global_pmu(void); diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index 94266a5c5b04..b825a5dd0210 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -8,8 +8,10 @@ #include <linux/compiler.h> #include <linux/string.h> +#include <linux/mm_types.h> #include <asm/asi.h> #include <asm/spitfire.h> +#include <asm/pgtable.h> #include <asm/processor.h> #include <asm-generic/access_ok.h> diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c index e5e5ff6b9a5c..b6663a3fbae9 100644 --- a/arch/sparc/kernel/leon_pci.c +++ b/arch/sparc/kernel/leon_pci.c @@ -62,15 +62,14 @@ void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info) int pcibios_enable_device(struct pci_dev *dev, int mask) { + struct resource *res; u16 cmd, oldcmd; int i; pci_read_config_word(dev, PCI_COMMAND, &cmd); oldcmd = cmd; - for (i = 0; i < PCI_NUM_RESOURCES; i++) { - struct resource *res = &dev->resource[i]; - + pci_dev_for_each_resource(dev, res, i) { /* Only set up the requested stuff */ if (!(mask & (1<<i))) continue; diff --git a/arch/sparc/kernel/of_device_32.c b/arch/sparc/kernel/of_device_32.c index 4ebf51e6e78e..b60f58e04164 100644 --- a/arch/sparc/kernel/of_device_32.c +++ b/arch/sparc/kernel/of_device_32.c @@ -29,7 +29,7 @@ static int of_bus_pci_match(struct device_node *np) * parent as-is, not with the PCI translate * method which chops off the top address cell. */ - if (!of_find_property(np, "ranges", NULL)) + if (!of_property_present(np, "ranges")) return 0; return 1; @@ -223,7 +223,7 @@ static int __init build_one_resource(struct device_node *parent, static int __init use_1to1_mapping(struct device_node *pp) { /* If we have a ranges property in the parent, use it. */ - if (of_find_property(pp, "ranges", NULL) != NULL) + if (of_property_present(pp, "ranges")) return 0; /* Some SBUS devices use intermediate nodes to express diff --git a/arch/sparc/kernel/of_device_64.c b/arch/sparc/kernel/of_device_64.c index 5a9f86b1d4e7..5b5143e17ba3 100644 --- a/arch/sparc/kernel/of_device_64.c +++ b/arch/sparc/kernel/of_device_64.c @@ -58,7 +58,7 @@ static int of_bus_pci_match(struct device_node *np) * parent as-is, not with the PCI translate * method which chops off the top address cell. */ - if (!of_find_property(np, "ranges", NULL)) + if (!of_property_present(np, "ranges")) return 0; return 1; @@ -78,7 +78,7 @@ static int of_bus_simba_match(struct device_node *np) * simba. */ if (of_node_name_eq(np, "pci")) { - if (!of_find_property(np, "ranges", NULL)) + if (!of_property_present(np, "ranges")) return 1; } @@ -283,7 +283,7 @@ static int __init build_one_resource(struct device_node *parent, static int __init use_1to1_mapping(struct device_node *pp) { /* If we have a ranges property in the parent, use it. */ - if (of_find_property(pp, "ranges", NULL) != NULL) + if (of_property_present(pp, "ranges")) return 0; /* If the parent is the dma node of an ISA bus, pass diff --git a/arch/sparc/kernel/of_device_common.c b/arch/sparc/kernel/of_device_common.c index e717a56efc5d..60f86b837658 100644 --- a/arch/sparc/kernel/of_device_common.c +++ b/arch/sparc/kernel/of_device_common.c @@ -162,7 +162,7 @@ int of_bus_sbus_match(struct device_node *np) * don't have some intervening real bus that provides * ranges based translations. */ - if (of_find_property(dp, "ranges", NULL) != NULL) + if (of_property_present(dp, "ranges")) break; dp = dp->parent; diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c index cb1ef25116e9..a948a49817c7 100644 --- a/arch/sparc/kernel/pci.c +++ b/arch/sparc/kernel/pci.c @@ -663,11 +663,10 @@ static void pci_claim_bus_resources(struct pci_bus *bus) struct pci_dev *dev; list_for_each_entry(dev, &bus->devices, bus_list) { + struct resource *r; int i; - for (i = 0; i < PCI_NUM_RESOURCES; i++) { - struct resource *r = &dev->resource[i]; - + pci_dev_for_each_resource(dev, r, i) { if (r->parent || !r->start || !r->flags) continue; @@ -724,15 +723,14 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm, int pcibios_enable_device(struct pci_dev *dev, int mask) { + struct resource *res; u16 cmd, oldcmd; int i; pci_read_config_word(dev, PCI_COMMAND, &cmd); oldcmd = cmd; - for (i = 0; i < PCI_NUM_RESOURCES; i++) { - struct resource *res = &dev->resource[i]; - + pci_dev_for_each_resource(dev, res, i) { /* Only set up the requested stuff */ if (!(mask & (1<<i))) continue; diff --git a/arch/sparc/kernel/pci_schizo.c b/arch/sparc/kernel/pci_schizo.c index 421aba00e6b0..23b47f7fdb1d 100644 --- a/arch/sparc/kernel/pci_schizo.c +++ b/arch/sparc/kernel/pci_schizo.c @@ -1270,7 +1270,7 @@ static void schizo_pbm_hw_init(struct pci_pbm_info *pbm) pbm->chip_version >= 0x2) tmp |= 0x3UL << SCHIZO_PCICTRL_PTO_SHIFT; - if (!of_find_property(pbm->op->dev.of_node, "no-bus-parking", NULL)) + if (!of_property_read_bool(pbm->op->dev.of_node, "no-bus-parking")) tmp |= SCHIZO_PCICTRL_PARK; else tmp &= ~SCHIZO_PCICTRL_PARK; diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c index 384480971805..7d91ca6aa675 100644 --- a/arch/sparc/kernel/pci_sun4v.c +++ b/arch/sparc/kernel/pci_sun4v.c @@ -193,7 +193,7 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size, size = IO_PAGE_ALIGN(size); order = get_order(size); - if (unlikely(order >= MAX_ORDER)) + if (unlikely(order > MAX_ORDER)) return NULL; npages = size >> IO_PAGE_SHIFT; diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c index ee4c9a9a171c..25fe0a061732 100644 --- a/arch/sparc/kernel/pcic.c +++ b/arch/sparc/kernel/pcic.c @@ -643,15 +643,14 @@ void pcibios_fixup_bus(struct pci_bus *bus) int pcibios_enable_device(struct pci_dev *dev, int mask) { + struct resource *res; u16 cmd, oldcmd; int i; pci_read_config_word(dev, PCI_COMMAND, &cmd); oldcmd = cmd; - for (i = 0; i < PCI_NUM_RESOURCES; i++) { - struct resource *res = &dev->resource[i]; - + pci_dev_for_each_resource(dev, res, i) { /* Only set up the requested stuff */ if (!(mask & (1<<i))) continue; diff --git a/arch/sparc/kernel/power.c b/arch/sparc/kernel/power.c index d941875dd718..8147985a1dc4 100644 --- a/arch/sparc/kernel/power.c +++ b/arch/sparc/kernel/power.c @@ -28,7 +28,7 @@ static int has_button_interrupt(unsigned int irq, struct device_node *dp) { if (irq == 0xffffffff) return 0; - if (!of_find_property(dp, "button", NULL)) + if (!of_property_read_bool(dp, "button")) return 0; return 1; diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index 91c2b8124527..b51d8fb0ecdc 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -95,7 +95,7 @@ void arch_cpu_idle(void) } #ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) +void __noreturn arch_cpu_idle_dead(void) { sched_preempt_enable_no_resched(); cpu_play_dead(); diff --git a/arch/sparc/kernel/prom_64.c b/arch/sparc/kernel/prom_64.c index f883a50fa333..998aa693d491 100644 --- a/arch/sparc/kernel/prom_64.c +++ b/arch/sparc/kernel/prom_64.c @@ -502,7 +502,7 @@ static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg) struct device_node *portid_parent = NULL; int portid = -1; - if (of_find_property(dp, "cpuid", NULL)) { + if (of_property_present(dp, "cpuid")) { int limit = 2; portid_parent = dp; diff --git a/arch/sparc/kernel/smp_32.c b/arch/sparc/kernel/smp_32.c index ad8094d955eb..87eaa7719fa2 100644 --- a/arch/sparc/kernel/smp_32.c +++ b/arch/sparc/kernel/smp_32.c @@ -120,7 +120,7 @@ void cpu_panic(void) struct linux_prom_registers smp_penguin_ctable = { 0 }; -void smp_send_reschedule(int cpu) +void arch_smp_send_reschedule(int cpu) { /* * CPU model dependent way of implementing IPI generation targeting diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c index a55295d1b924..e5964d1d8b37 100644 --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -1430,7 +1430,7 @@ static unsigned long send_cpu_poke(int cpu) return hv_err; } -void smp_send_reschedule(int cpu) +void arch_smp_send_reschedule(int cpu) { if (cpu == smp_processor_id()) { WARN_ON_ONCE(preemptible()); diff --git a/arch/sparc/kernel/time_32.c b/arch/sparc/kernel/time_32.c index 8a08830e4a65..958c2cf4479b 100644 --- a/arch/sparc/kernel/time_32.c +++ b/arch/sparc/kernel/time_32.c @@ -277,7 +277,7 @@ static int clock_probe(struct platform_device *op) return -ENODEV; /* Only the primary RTC has an address property */ - if (!of_find_property(dp, "address", NULL)) + if (!of_property_present(dp, "address")) return -ENODEV; m48t59_rtc.resource = &op->resource[0]; diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c index 5b4de4a89dec..08ffd17d5ec3 100644 --- a/arch/sparc/kernel/traps_64.c +++ b/arch/sparc/kernel/traps_64.c @@ -897,7 +897,7 @@ void __init cheetah_ecache_flush_init(void) /* Now allocate error trap reporting scoreboard. */ sz = NR_CPUS * (2 * sizeof(struct cheetah_err_info)); - for (order = 0; order < MAX_ORDER; order++) { + for (order = 0; order <= MAX_ORDER; order++) { if ((PAGE_SIZE << order) >= sz) break; } diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c index 912205787161..5e2931a18409 100644 --- a/arch/sparc/mm/tsb.c +++ b/arch/sparc/mm/tsb.c @@ -402,8 +402,8 @@ void tsb_grow(struct mm_struct *mm, unsigned long tsb_index, unsigned long rss) unsigned long new_rss_limit; gfp_t gfp_flags; - if (max_tsb_size > (PAGE_SIZE << MAX_ORDER)) - max_tsb_size = (PAGE_SIZE << MAX_ORDER); + if (max_tsb_size > PAGE_SIZE << MAX_ORDER) + max_tsb_size = PAGE_SIZE << MAX_ORDER; new_cache_index = 0; for (new_size = 8192; new_size < max_tsb_size; new_size <<= 1UL) { |