megasas_che...e_4gb_region(9)

💅 megasas_check_same_4gb_region 💅

okay so this is a page from the Kernel API Manual bestie, and it's about one (1) very specific little vibe check for DMA allocations in the megaraid SAS fusion driver ✨

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✨ NAME ✨

megasas_check_same_4gb_region — literally just checks whether an allocation crosses the same 4GB boundary or not 🎀

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🌸 SYNOPSIS 🌸

bool megasas_check_same_4gb_region (struct megasas_instance *instance ,
dma_addr_t start_addr , size_t size );

that's it. that's the whole signature. she's compact and she knows it 💅

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🦋 ARGUMENTS 🦋

• instance — the adapter's soft instance 🫶 like, the megasas thing that owns the hardware vibe
• start_addr — start address of the DMA allocation 📍 where the memory chunk begins
• size — size of the allocation in bytes 📏 how much we're grabbing

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⭐ RETURN ⭐

• true : allocation does not cross same 4GB boundary ✅ slay, it fits
• false : allocation crosses same 4GB boundary ❌ not the vibe, it spilled over

no cap, it's giving binary. two outcomes, zero in between 💀

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🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/scsi/megaraid/megaraid_sas_fusion.c 📁 and honestly the whole friend group is here:

• megasas_adp_reset_wait_for_ready(9)
• megasas_enable_intr_fusion(9)
• megasas_disable_intr_fusion(9)
• megasas_get_cmd_fusion(9)
• megasas_return_cmd_fusion(9)
• megasas_write_64bit_req_desc(9)
• megasas_fire_cmd_fusion(9)
• megasas_fusion_update_can_queue(9)
• megasas_free_cmds_fusion(9)
• megasas_create_sg_sense_fusion(9)
• megasas_alloc_cmds_fusion(9)
• wait_and_poll(9)
• megasas_ioc_init_fusion(9)
• megasas_sync_pd_seq_num(9)
• megasas_allocate_raid_maps(9)
• megasas_configure_queue_sizes(9)
• megasas_free_ioc_init_cmd(9)
• megasas_init_adapter_fusion(9)
• megasas_fault_detect_work(9)
• map_cmd_status(9)
• megasas_is_prp_possible(9)
• megasas_make_prp_nvme(9)
• megasas_make_sgl_fusion(9)
• megasas_make_sgl(9)
• megasas_set_pd_lba(9)
• megasas_stream_detect(9)
• megasas_set_raidflag_cpu_affinity(9)
• megasas_build_ldio_fusion(9)
• megasas_build_ld_nonrw_fusion(9)
• megasas_build_syspd_fusion(9)
• megasas_build_io_fusion(9)
• megasas_build_and_issue_cmd_fusion(9)
• megasas_complete_r1_command(9)
• access_irq_context(9)
• release_irq_context(9)
• complete_cmd_fusion(9)
• megasas_enable_irq_poll(9)
• megasas_sync_irqs(9)
• megasas_irqpoll(9)
• megasas_complete_cmd_dpc_fusion(9)
• megasas_isr_fusion(9)
• build_mpt_mfi_pass_thru(9)
• build_mpt_cmd(9)
• megasas_issue_dcmd_fusion(9)
• megasas_release_fusion(9)
• megasas_read_fw_status_reg_fusion(9)
• megasas_alloc_host_crash_buffer(9)
• megasas_free_host_crash_buffer(9)
• megasas_adp_reset_fusion(9)
• megasas_check_reset_fusion(9)
• megasas_trigger_snap_dump(9)
• megasas_tm_response_code(9)
• megasas_issue_tm(9)

like… the entire fusion roster showed up to the party 🎉 obsessed honestly 👑

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lowkey remember: this is all (9) kernel API territory, so it's for driver devs, not your average terminal gremlin 🧚

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and that's the whole page bestie, no skips, no cap 💖 this cutie came from ./drivers/scsi/megaraid, dated October 2026, and she answers to the name megasas_che...e_4gb_region(9) — a true icon, a legend, the moment 🎀✨🦋