Pascal reported and bisected a commit: | x86/PCI: don't call e820_all_mapped with -1 in the mmconfig case which broke one system system. ACPI: Using IOAPIC for interrupt routing PCI: MCFG configuration 0: base f0000000 segment 0 buses 0 - 255 PCI: MCFG area at f0000000 reserved in ACPI motherboard resources PCI: Using MMCONFIG for extended config space it didn't have PCI: updated MCFG configuration 0: base f0000000 segment 0 buses 0 - 63 anymore, and try to use 0xf000000 - 0xffffffff for mmconfig For 32bit, mcfg_res->end could be 32bit only (if 64 resources aren't used) So use end - 1 to pass the value in mcfg->end to avoid overflow. We don't need to worry about the e820 path, they are always 64 bit.
Unified · Split
| @@ -375,7 +375,7 @@ static acpi_status __init check_mcfg_resource(struct acpi_resource *res, · 374 unmodified lines | ||
| 375 | 375 | if (!fixmem32) |
| 376 | 376 | return AE_OK; |
| 377 | 377 | if ((mcfg_res->start >= fixmem32->address) && |
| 378 | − (mcfg_res->end <= (fixmem32->address + | |
| 378 | + (mcfg_res->end < (fixmem32->address + | |
| 379 | 379 | fixmem32->address_length))) { |
| 380 | 380 | mcfg_res->flags = 1; |
| 381 | 381 | return AE_CTRL_TERMINATE; |
| @@ -392,7 +392,7 @@ static acpi_status __init check_mcfg_resource(struct acpi_resource *res, · 10 unmodified lines | ||
| 392 | 392 | return AE_OK; |
| 393 | 393 | |
| 394 | 394 | if ((mcfg_res->start >= address.minimum) && |
| 395 | − (mcfg_res->end <= (address.minimum + address.address_length))) { | |
| 395 | + (mcfg_res->end < (address.minimum + address.address_length))) { | |
| 396 | 396 | mcfg_res->flags = 1; |
| 397 | 397 | return AE_CTRL_TERMINATE; |
| 398 | 398 | } |
| @@ -418,7 +418,7 @@ static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used) · 19 unmodified lines | ||
| 418 | 418 | struct resource mcfg_res; |
| 419 | 419 | |
| 420 | 420 | mcfg_res.start = start; |
| 421 | − mcfg_res.end = end; | |
| 421 | + mcfg_res.end = end - 1; | |
| 422 | 422 | mcfg_res.flags = 0; |
| 423 | 423 | |
| 424 | 424 | acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL); |