kernel/linux.git/arch/mips/dec, branch v5.10.257

MIPS: dec: Declare which_prom() as static

2025-05-02T05:41:08+00:00

commit 55fa5868519bc48a7344a4c070efa2f4468f2167 upstream. 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 Signed-off-by: Greg Kroah-Hartman

mips: DEC: honor CONFIG_MIPS_FP_SUPPORT=n

2022-04-08T12:40:20+00:00

[ Upstream commit 97bf0395c226907e1a9b908511a35192bf1e09bb ] 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 Signed-off-by: Sasha Levin

DEC: Limit PMAX memory probing to R3k systems

2022-04-08T12:39:57+00:00

commit 244eae91a94c6dab82b3232967d10eeb9dfa21c6 upstream. 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 Signed-off-by: Greg Kroah-Hartman

MIPS: DEC: Restore bootmem reservation for firmware working memory area

2020-10-14T21:57:57+00:00

Fix a crash on DEC platforms starting with: VFS: Mounted root (nfs filesystem) on device 0:11. Freeing unused PROM memory: 124k freed BUG: Bad page state in process swapper pfn:00001 page:(ptrval) refcount:0 mapcount:-128 mapping:00000000 index:0x1 pfn:0x1 flags: 0x0() raw: 00000000 00000100 00000122 00000000 00000001 00000000 ffffff7f 00000000 page dumped because: nonzero mapcount Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.0-00858-g865c50e1d279 #1 Stack : 8065dc48 0000000b 8065d2b8 9bc27dcc 80645bfc 9bc259a4 806a1b97 80703124 80710000 8064a900 00000001 80099574 806b116c 1000ec00 9bc27d88 806a6f30 00000000 00000000 80645bfc 00000000 31232039 80706ba4 2e392e35 8039f348 2d383538 00000070 0000000a 35363867 00000000 806c2830 80710000 806b0000 80710000 8064a900 00000001 81000000 00000000 00000000 8035af2c 80700000 ... Call Trace: [<8004bc5c>] show_stack+0x34/0x104 [<8015675c>] bad_page+0xfc/0x128 [<80157714>] free_pcppages_bulk+0x1f4/0x5dc [<801591cc>] free_unref_page+0xc0/0x130 [<8015cb04>] free_reserved_area+0x144/0x1d8 [<805abd78>] kernel_init+0x20/0x100 [<80046070>] ret_from_kernel_thread+0x14/0x1c Disabling lock debugging due to kernel taint caused by an attempt to free bootmem space that as from commit b93ddc4f9156 ("mips: Reserve memory for the kernel image resources") has not been anymore reserved due to the removal of generic MIPS arch code that used to reserve all the memory from the beginning of RAM up to the kernel load address. This memory does need to be reserved on DEC platforms however as it is used by REX firmware as working area, as per the TURBOchannel firmware specification[1]: Table 2-2 REX Memory Regions ------------------------------------------------------------------------- Starting Ending Region Address Address Use ------------------------------------------------------------------------- 0 0xa0000000 0xa000ffff Restart block, exception vectors, REX stack and bss 1 0xa0010000 0xa0017fff Keyboard or tty drivers 2 0xa0018000 0xa001f3ff 1) CRT driver 3 0xa0020000 0xa002ffff boot, cnfg, init and t objects 4 0xa0020000 0xa002ffff 64KB scratch space ------------------------------------------------------------------------- 1) Note that the last 3 Kbytes of region 2 are reserved for backward compatibility with previous system software. ------------------------------------------------------------------------- (this table uses KSEG2 unmapped virtual addresses, which in the MIPS architecture are offset from physical addresses by a fixed value of 0xa0000000 and therefore the regions referred do correspond to the beginning of the physical address space) and we call into the firmware on several occasions throughout the bootstrap process. It is believed that pre-REX firmware used with non-TURBOchannel DEC platforms has the same requirements, as hinted by note #1 cited. Recreate the discarded reservation then, in DEC platform code, removing the crash. References: [1] "TURBOchannel Firmware Specification", On-line version, EK-TCAAD-FS-004, Digital Equipment Corporation, January 1993, Chapter 2 "System Module Firmware", p. 2-5 Signed-off-by: Maciej W. Rozycki Fixes: b93ddc4f9156 ("mips: Reserve memory for the kernel image resources") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Thomas Bogendoerfer

MIPS: dec: fix section mismatch

2020-10-14T21:54:28+00:00

Drop inline for memory setup functions and mark them __init to fix section mismatch of pmax_setup_memory_region. Signed-off-by: Thomas Bogendoerfer Acked-by: Maciej W. Rozycki

MIPS: replace add_memory_region with memblock

2020-10-12T10:01:36+00:00

add_memory_region was the old interface for registering memory and was already changed to used memblock internaly. Replace it by directly calling memblock functions. Signed-off-by: Thomas Bogendoerfer

MIPS: Only include the platform file needed

2020-05-12T22:17:18+00:00

Instead of including all Platform files, we simply include the needed one and avoid clashes with makefile variables. Signed-off-by: Thomas Bogendoerfer

MIPS: asm: Rename some macros to avoid build errors

2020-05-07T11:20:05+00:00

Use ASM_ prefix to rename some macros (PANIC and PRINT), in order to avoid build errors (all users are updated as well): 1, PANIC conflicts with drivers/scsi/smartpqi/smartpqi_init.c 2, PRINT conflicts with net/netfilter/nf_conntrack_h323_asn1.c and net/ mac80211/debugfs_sta.c Fixes: d339cd02b888eb8 ("MIPS: Move unaligned load/store helpers to inst.h") Reported-by: kbuild test robot Signed-off-by: Huacai Chen Signed-off-by: Thomas Bogendoerfer

MIPS: Use fallthrough for arch/mips

2020-05-07T09:55:47+00:00

Convert the various /* fallthrough */ comments to the pseudo-keyword fallthrough; Done via script: https://lore.kernel.org/lkml/b56602fcf79f849e733e7b521bb0e17895d390fa.1582230379.git.joe@perches.com/ Signed-off-by: Liangliang Huang Reviewed-by: Huacai Chen Signed-off-by: Thomas Bogendoerfer

MIPS: pass non-NULL dev_id on shared request_irq()

2020-03-16T15:04:49+00:00

Recently all usages of setup_irq() was replaced by request_irq(). request_irq() does a few sanity checks that were not done in setup_irq(), if they fail irq registration will fail. One of the check is to ensure that non-NULL dev_id is passed in the case of shared irq. This caused malta on qemu to hang. Fix it by passing handler as dev_id to all request_irq()'s that are shared. For sni, instead of passing non-NULL dev_id, remove shared irq flags. Fixes: ac8fd122e070 ("MIPS: Replace setup_irq() by request_irq()") Reported-by: Nathan Chancellor Suggested-by: Thomas Bogendoerfer Signed-off-by: afzal mohammed Tested-by: Guenter Roeck Tested-by: Nathan Chancellor Signed-off-by: Thomas Bogendoerfer