xa_is_zero(9)

💅 xa_is_zero(9) — the "is this entry a zero entry?" check

okay so real quick, bestie: this is xa_is_zero, straight out of the Kernel API Manual ✨ and it's about to be your new fave tiny bool function.

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🎀 NAME

xa_is_zero — literally just asking "is this entry a zero entry?" and honestly? iconic question. 💖

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✨ SYNOPSIS

bool xa_is_zero (const void *entry );

like yes that's the whole signature, she's short and she knows it 🫶

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🌸 ARGUMENTS

• entry — an entry you got back from the XArray. that's it, that's the vibe. you retrieved it from the XArray, now hand it over 💅

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🦋 DESCRIPTION

so here's the tea, bestie 🍵 — the normal API will hand you back NULL as the contents of a slot that's actually holding a zero entry. like, she's hiding it from you. rude but okay.

the way that means you can only see zero entries by using the advanced API. no cap. the basic one's just not gonna show you. 🙈

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⭐ RETURN

true if the entry is a zero entry. that's it, that's the return value, she said what she said 💀

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🔥 SEE ALSO

the reading list is long but we're getting through it together, bestie 😭💜

• Kernel file ./include/linux/xarray.h
• xa_mk_value(9), xa_to_value(9), xa_is_value(9)
• xa_tag_pointer(9), xa_untag_pointer(9), xa_pointer_tag(9)
• xa_is_err(9), xa_err(9)
• struct xa_limit(9), struct xarray(9)
• DEFINE_XARRAY_FLAGS(9), DEFINE_XARRAY(9), DEFINE_XARRAY_ALLOC(9), DEFINE_XARRAY_ALLOC1(9)
• xa_init_flags(9), xa_init(9)
• xa_empty(9), xa_marked(9)
• xa_for_each_range(9), xa_for_each_start(9), xa_for_each(9), xa_for_each_marked(9)
• xa_store_bh(9), xa_store_irq(9)
• xa_erase_bh(9), xa_erase_irq(9)
• xa_cmpxchg(9), xa_cmpxchg_bh(9), xa_cmpxchg_irq(9)
• xa_insert(9), xa_insert_bh(9), xa_insert_irq(9)
• xa_alloc(9), xa_alloc_bh(9), xa_alloc_irq(9)
• xa_alloc_cyclic(9), xa_alloc_cyclic_bh(9), xa_alloc_cyclic_irq(9)
• xa_reserve(9), xa_reserve_bh(9), xa_reserve_irq(9)
• xa_release(9)
• xa_is_sibling(9), xa_is_retry(9), xa_is_advanced(9)
• xa_update_node_t(9)
• XA_STATE(9), XA_STATE_ORDER(9)
• xas_error(9), xas_set_err(9)
• xas_invalid(9), xas_valid(9), xas_is_node(9)
• xas_reset(9), xas_retry(9), xas_reload(9)
• xas_set(9), xas_advance(9), xas_set_order(9), xas_set_update(9)
• xas_next_entry(9), xas_next_marked(9)
• xas_for_each(9), xas_for_each_marked(9), xas_for_each_conflict(9)
• xas_prev(9), xas_next(9)

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okay that's genuinely the whole page and yes she's little but she's important 💅 don't sleep on the zero entry check.

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mwah, that's a wrap 🌈 this one came from ./include/linux, dated October 2026 — go forth and vibe check your entries, bestie 🎀✨