linux/arch/mips/dec, branch master

MIPS: DEC: Rate-limit memory errors for non-KN01 parity systems

2026-04-06T12:02:24Z

Similarly to memory errors in ECC systems also rate-limit memory parity errors for KN02-BA, KN02-CA, KN04-BA, KN04-CA DECstation and DECsystem models. Unlike with ECC these events are always fatal and are less likely to cause a message flood, but handle them the same way for consistency. Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer

MIPS: DEC: Rate-limit memory errors for KN01 systems

2026-04-06T12:02:19Z

Similarly to memory errors in ECC systems also rate-limit memory parity errors for KN01 DECstation and DECsystem models. Unlike with ECC these events are always fatal and are less likely to cause a message flood, but handle them the same way for consistency. Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer

MIPS: DEC: Rate-limit memory errors for ECC systems

2026-04-06T12:02:14Z

Prevent the system from becoming unusable due to a flood of memory error messages with DECstation and DECsystem models using ECC, that is KN02, KN03 and KN05 systems. It seems common for gradual oxidation of memory module contacts to cause memory errors to eventually develop and while ECC takes care of correcting them and the system affected can continue operating normally until the contacts have been cleaned, the unlimited messages make the system spend all its time on producing them, therefore preventing it from being used. Rate-limiting removes the load from the system and enables its normal operation, e.g.: Bus error interrupt: CPU memory read ECC error at 0x139cfb04 ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU partial memory write ECC error at 0x138c1f5c ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU partial memory write ECC error at 0x138c1f6c ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x139cff64 ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x136af00c ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x136af044 ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x136af0cc ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x136af0cc ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x136af0e4 ECC syndrome 0x54 -- corrected single bit error at data bit D3 Bus error interrupt: CPU memory read ECC error at 0x136af104 ECC syndrome 0x54 -- corrected single bit error at data bit D3 dec_ecc_be_backend: 34455 callbacks suppressed Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer

MIPS: dec: Declare which_prom() as static

2025-02-27T09:40:45Z

Declare which_prom() as static to suppress gcc compiler warning that 'missing-prototypes'. This function is not intended to be called from other parts. Fix follow error with gcc-14 when -Werror: arch/mips/dec/prom/init.c:45:13: error: no previous prototype for ‘which_prom’ [-Werror=missing-prototypes] 45 | void __init which_prom(s32 magic, s32 *prom_vec) | ^~~~~~~~~~ cc1: all warnings being treated as errors make[6]: *** [scripts/Makefile.build:207: arch/mips/dec/prom/init.o] Error 1 make[5]: *** [scripts/Makefile.build:465: arch/mips/dec/prom] Error 2 make[5]: *** Waiting for unfinished jobs.... Signed-off-by: WangYuli Signed-off-by: Thomas Bogendoerfer

genirq: Convert kstat_irqs to a struct

2024-04-12T15:08:05Z

The irq_desc::kstat_irqs member is a per-CPU variable of type int, which is only capable of counting. A snapshot mechanism for interrupt statistics will be added soon, which requires an additional variable to store the snapshot. To facilitate expansion, convert kstat_irqs here to a struct containing only the count. Originally-by: Thomas Gleixner Signed-off-by: Bitao Hu Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20240411074134.30922-2-yaoma@linux.alibaba.com

MIPS: fix typos in comments

2022-05-04T20:22:59Z

Various spelling mistakes in comments. Detected with the help of Coccinelle. Signed-off-by: Julia Lawall Signed-off-by: Thomas Bogendoerfer

DEC: Limit PMAX memory probing to R3k systems

2022-03-07T12:10:44Z

Recent tightening of the opcode table in binutils so as to consistently disallow the assembly or disassembly of CP0 instructions not supported by the processor architecture chosen has caused a regression like below: arch/mips/dec/prom/locore.S: Assembler messages: arch/mips/dec/prom/locore.S:29: Error: opcode not supported on this processor: r4600 (mips3) `rfe' in a piece of code used to probe for memory with PMAX DECstation models, which have non-REX firmware. Those computers always have an R2000 CPU and consequently the exception handler used in memory probing uses the RFE instruction, which those processors use. While adding 64-bit support this code was correctly excluded for 64-bit configurations, however it should have also been excluded for irrelevant 32-bit configurations. Do this now then, and only enable PMAX memory probing for R3k systems. Reported-by: Jan-Benedict Glaw Reported-by: Sudip Mukherjee Signed-off-by: Maciej W. Rozycki Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org # v2.6.12+ Signed-off-by: Thomas Bogendoerfer

mips: DEC: honor CONFIG_MIPS_FP_SUPPORT=n

2022-03-07T12:10:09Z

Include the DECstation interrupt handler in opting out of FPU support. Fixes a linker error: mips-linux-ld: arch/mips/dec/int-handler.o: in function `fpu': (.text+0x148): undefined reference to `handle_fpe_int' Fixes: 183b40f992c8 ("MIPS: Allow FP support to be disabled") Signed-off-by: Randy Dunlap Reported-by: kernel test robot Cc: Paul Burton Cc: Thomas Bogendoerfer Cc: Maciej W. Rozycki Cc: linux-mips@vger.kernel.org Acked-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer

mips: dec: provide the correctly capitalized config CPU_R4X00 in init error message

2021-12-16T14:47:37Z

The config for MIPS R4000-series processors is named CPU_R4X00 with upper-case X, not CPU_R4x00 as the error message suggests. Hence, ./scripts/checkkconfigsymbols.py reports this invalid reference: CPU_R4x00 Referencing files: arch/mips/dec/prom/init.c When human users encounter this error message, they probably just deal with this minor discrepancy; so, the spelling never was a big deal here. Still, the script ./scripts/checkkconfigsymbols.py has been quite useful to identify a number of bugs with Kconfig symbols and deserves to be executed and checked regularly. So, repair the error message to reduce the reports made the script and simplify to use this script, as new issues are easier to spot when the list of reports is shorter. Signed-off-by: Lukas Bulwahn Signed-off-by: Thomas Bogendoerfer

MIPS: Allow modules to set board_be_handler

2021-11-09T15:07:26Z

After making the brcmstb_gisb driver modular with 707a4cdf86e5 ("bus: brcmstb_gisb: Allow building as module") Guenter reported that mips allmodconfig failed to link because board_be_handler was referenced. Thomas indicated that if we were to continue making the brcmstb_gisb driver modular for MIPS we would need to introduce a function that allows setting the board_be_handler and export that function towards modules. This is what is being done here: board_be_handler is made static and is now settable with a mips_set_be_handler() function which is exported. Reported-by: Guenter Roeck Suggested-by: Thomas Bogendoerfer Fixes: 707a4cdf86e5 ("bus: brcmstb_gisb: Allow building as module") Signed-off-by: Florian Fainelli Tested-by: Guenter Roeck Signed-off-by: Thomas Bogendoerfer