for_each_zone(9)

💅 for_each_zone 💅

Welcome to the for_each_zone(9) page from the Kernel API Manual, bestie. This one is a tiny little helper macro, and it's honestly giving “small but iconic.” 🫶

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✨ NAME ✨

for_each_zone — helper macro to iterate over all memory zones. Periodt. 💖

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🎀 SYNOPSIS 🎀

for_each_zone (zone );

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🌸 ARGUMENTS 🌸

• zone — pointer to a struct zone variable. That's the variable you're handing over, and yes, it is literally a pointer to struct zone. 🦋

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🧚 DESCRIPTION 🧚

Okay so here's the whole vibe: the user only needs to declare the zone variable, and for_each_zone fills it in. That's it. That's the tea. No extra steps, no dramatic monologue. ✨

Bestie, just declare zone and let the macro do its little fill-in moment. 💅

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🔥 SEE ALSO 🔥

Kernel file: ./include/linux/mmzone.h

• is_highmem(9)
• for_each_online_pgdat(9)
• next_zones_zonelist(9)
• first_zones_zonelist(9)
• for_each_zone_zonelist_nodemask(9)
• for_each_zone_zonelist(9)
• pfn_valid(9)

Go read those too, iykyk. 👑🌈

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Mwah 💋 this little kernel love letter comes from the source/version ./include/linux, dated October 2026, and it's your one and only for_each_zone(9) page. Slay. 🎀💜