wireguard-linux/arch/mips/Kconfig, branch stable

mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ

2026-09-08T14:10:50Z

On I6500 CPU cores, lld and scd give no ordering guarantees (same as all other instructions). To respect the assumption that arch_cmpxchg() is fully ordered, we must inject sync instructions above and below our lld/scd loops using the already in place WEAK_REORDERING_BEYOND_LLSC infrastructure. Otherwise, bad things can happen: [ 34.054496] CPU 3 Unable to handle kernel paging request at virtual address 0000000000000000, epc == a80000080838e01c, ra == a80000080838dfc4 [ 34.054559] Oops[#1]: [ 34.069561] CPU: 3 UID: 0 PID: 170 Comm: pipe_race Not tainted 7.2.0-rc6-01553-gb73c35220968-dirty #103 VOLUNTARY [ 34.079932] Hardware name: Mobile EyeQ5 MP5 Evaluation board [ 34.085592] $ 0 : 0000000000000000 0000000000000001 0000000000000000 0000000000000000 [ 34.093616] $ 4 : a800000808ee2618 000000000b7a879d 0000000000001000 0000000000000000 [ 34.101638] $ 8 : 0000000000e3f2c9 0000000000000000 a800000808a2a9f8 0000000000000000 [ 34.109660] $12 : a8000008139ffcd8 ffffffff84080018 a80000080837fae0 7878787878787878 [ 34.117682] $16 : a800000807e82940 0000000000001000 0000000000000000 0000000000000000 [ 34.125704] $20 : a800000802920e00 a8000008139ffdf8 a800000802649400 0000000000e3f2c9 [ 34.133726] $24 : 0000000000000006 00000001200406e0 [ 34.141783] $28 : a8000008139fc000 a8000008139ffd10 0000000000e3f2c8 a80000080838dfc4 [ 34.149837] epc : a80000080838e01c anon_pipe_read+0xd4/0x428 [ 34.155697] ra : a80000080838dfc4 anon_pipe_read+0x7c/0x428 [ 34.161549] Status: 140000e3 KX SX UX KERNEL EXL IE [ 34.166551] Cause : 40800408 (ExcCode 02) [ 34.170574] BadVA : 0000000000000000 [ 34.174161] PrId : 0001b028 (MIPS I6500) [ 34.178183] Process pipe_race (pid: 170, threadinfo=000000005ca35720, task=00000000e1013890, tls=000000014ebbb780) [ 34.188568] Stack : a800000802649400 0000000000000000 0000000000000000 a8000008139ffdd0 [ 34.196623] 0000000000000fba a800000808ee0000 0000000000000001 a8000008130c3e80 [ 34.204676] a8000008080d1280 a8000008139ffd58 a8000008139ffd58 1dbd2b22ea1dd500 [ 34.212729] a800000802649400 a800000808ee0000 ffffffffffffffea 0000000000000001 [ 34.220783] 0000000000001000 0000000000000000 00000001200ae518 ffffffffffffffff [ 34.228836] 000000fffbe0e530 a80000080837edf4 000000fffbe0e530 0000000000000000 [ 34.236890] 0000000000000000 0000000000000000 000000014ebb55a0 0000000000001000 [ 34.244943] 0000000000000001 a800000802649400 0000000000000000 0000000000000000 [ 34.252996] 0000000000000000 0000400400000000 0000000000000000 1dbd2b22ea1dd500 [ 34.261049] 00000000140000e3 a800000802649400 a800000802649400 a800000808ee0000 [ 34.269103] ... [ 34.271568] Call Trace: [ 34.274026] [] anon_pipe_read+0xd4/0x428 [ 34.279533] [] vfs_read+0x25c/0x318 [ 34.284607] [] ksys_read+0x104/0x138 [ 34.289763] [] syscall_common+0x44/0x68 [ 34.295187] [ 34.296689] Code: f84000cf 02209825 de020010 d8400004 02002825 0040f809 02802025 f84000c3 [ 34.306504] [ 34.308099] ---[ end trace 0000000000000000 ]--- My initial reproducer was the xdp-tools test suite. A standalone reproducer would be an lld/scd loop that, when the read is reordered by the CPU, triggers a fault. We can achieve this from userspace by stressing an anonymous pipe, which uses a mutex. Program used: // SPDX-License-Identifier: GPL-2.0 // pipe_race.c - reproducer for MIPS LL/SC reordering vs fs/pipe.c // // Two userspace processes on an anonymous pipe: // parent = writer: tight write() loop // child = reader: tight read() loop #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include int main(void) { long wrsize = 70; // bytes per write() long rdsize = 4096; // bytes per read() int pfd[2]; char *buf; pid_t pid; int ret; ret = pipe(pfd); assert(!ret); pid = fork(); assert(pid >= 0); if (pid == 0) { /* reader */ close(pfd[1]); buf = malloc(rdsize); assert(buf); for (;;) { ssize_t n = read(pfd[0], buf, rdsize); if (n < 0 && errno == EINTR) continue; if (n <= 0) _exit(n < 0 ? 1 : 0); } } close(pfd[0]); /* writer */ buf = malloc(wrsize); assert(buf); memset(buf, 'x', wrsize); for (;;) { ssize_t n = write(pfd[1], buf, wrsize); if (n < 0 && errno == EINTR) continue; if (n != wrsize) break; } kill(pid, SIGKILL); wait(NULL); return 0; } Fixes: fbe0fae601b7 ("MIPS: mobileye: Add EyeQ6H support") Cc: stable@vger.kernel.org Signed-off-by: Théo Lebrun Reviewed-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

mips: econet: fix unmet dependencies for ECONET

2026-09-08T14:09:48Z

ECONET selects EARLY_PRINTK_8250, SERIAL_OF_PLATFORM, and SERIAL_8250 without ensuring their dependencies, EARLY_PRINTK and TTY are met. This causes unmet dependencies: WARNING: unmet direct dependencies detected for SERIAL_8250 Depends on [n]: TTY [=n] && HAS_IOMEM [=y] && !S390 Selected by [y]: - ECONET [=y] WARNING: unmet direct dependencies detected for EARLY_PRINTK_8250 Depends on [n]: EARLY_PRINTK [=n] && USE_GENERIC_EARLY_PRINTK_8250 [=y] Selected by [y]: - ECONET [=y] WARNING: unmet direct dependencies detected for SERIAL_OF_PLATFORM Depends on [n]: TTY [=n] && HAS_IOMEM [=y] && SERIAL_8250 [=y] && OF [=y] Selected by [y]: - ECONET [=y] However, in the discussion of v1 of this patch, Arnd pointed out that these selects don't belong here in the first place. [1] Let's remove them to resolve the unmet dependencies. These unmet dependencies were found by kconfirm, a static analysis tool for Kconfig. Fixes: 79ee1d20e37c ("mips: econet: Fix incorrect Kconfig dependencies") Fixes: 35fb26f94dfa ("mips: Add EcoNet MIPS platform support") Suggested-by: Arnd Bergmann Signed-off-by: Julian Braha Tested-by: Caleb James DeLisle Signed-off-by: Thomas Bogendoerfer

Merge tag 'mips_7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2026-08-21T19:39:49Z

Pull MIPS updates from Thomas Bogendoerfer: - switch gpio code to use swnodes - rework of TXX9 gpio code - enable multi-vpe for econet - cleanups and fixes * tag 'mips_7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: mips: dts: econet: Describe dual-VPE 34Kc processor mips: econet: add multi-vpe capability to EN751221 MIPS: ptrace: Fix syscall skipping via PTRACE_SYSCALL mips: remove dead select MIPS: BCM47XX: Convert buttons to software nodes ssb: gpio: Add and register software node for GPIO controller bcma: gpio: Add and register software node for GPIO controller MIPS: ip22-gio: Drop #include of MIPS: TXX9: Clean up txx9_iocled_init() MIPS: TXX9: Convert gpio_txx9 to dynamic GPIO base allocation MIPS: TXX9: Drop GPIOLIB_LEGACY select MIPS: TXX9: Use GPIO lookup table for iocled LEDs MIPS: TXX9: Reduce TXX9_IOCLED_MAXLEDS to 3 MIPS: TXX9: rbtx4927: Use GPIO lookup table for TXx9 LEDs MIPS: TXX9: rbtx4927: Use GPIO lookup table for SIO DTR MIPS: TXX9: Remove txx9_7segled_*() forward declarations MIPS: TXX9: Remove tx4938_spi_init() and txx9_spi_init() MIPS: kernel: proc: Use two seq_putc() calls in show_cpuinfo()

mips: remove dead select

2026-08-03T13:03:06Z

'select' does not work on config options in a 'choice', so the current 'select CPU_BIG_ENDIAN' does nothing (dead code). However, ECONET already also selects SYS_SUPPORTS_BIG_ENDIAN so this means that CPU_BIG_ENDIAN will always be set. Let's remove the unnecessary 'select CPU_BIG_ENDIAN'. This dead select was found by kconfirm, a static analysis tool for Kconfig. Signed-off-by: Julian Braha Acked-by: Arnd Bergmann Signed-off-by: Thomas Bogendoerfer

vdso: Drop HAVE_GENERIC_VDSO from architecture kconfig files

2026-07-15T08:49:03Z

Now that GENERIC_GETTIMEOFDAY and VDSO_GETRANDOM enable HAVE_GENERIC_VDSO automatically, the architecture specific kconfig files do not need to do so anymore. Remove the corresponding lines. Keep them for riscv, loongarch and powerpc as those have their own explicit usage of the vDSO datastore provided by HAVE_GENERIC_VDSO. Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Reviewed-by: Vincenzo Frascino Link: https://patch.msgid.link/20260709-vdso-have_generic_vdso-v1-5-d2e1061f268b@linutronix.de

Merge tag 'mips_7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2026-06-19T14:46:16Z

Pull MIPS updates from Thomas Bogendoerfer: - use software nodes for GPIO code - cleanups and fixes * tag 'mips_7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (41 commits) mips: select legacy gpiolib interfaces where used MIPS: lib: Remove '.hidden' for local symbols MIPS: VDSO: Avoid including .got in dynamic segment MIPS: smp: report dying CPU to RCU in stop_this_cpu() MIPS: kernel: proc: Delete unnecessary braces in show_cpuinfo() MIPS: kernel: proc: Use seq_putc() calls in show_cpuinfo() mips: sched: Fix CPUMASK_OFFSTACK memory corruption MIPS: mm: Fix out-of-bounds write in maar_res_walk() MIPS: ath79: reduce ARCH_DMA_MINALIGN mips: dts: ar9132: fix wdt node name mips: Remove remaining defconfig references to the pktcdvd driver MIPS: mm: remove comment referring to removed CONFIG_MIPS_CMP MIPS: alchemy: db1300: switch to static device properties MIPS: alchemy: gpr: switch to static device properties MIPS: alchemy: db1000: use nodes attached to GPIO chips in properties MIPS: alchemy: mtx1: attach software nodes to GPIO chips MIPS: alchemy: provide visible function prototypes to board files MIPS: alchemy: platform: add missing include MIPS: ip22-gio: do not export device release function MIPS: ip22-gio: switch to dynamic root device ...

Merge tag 'bitmap-for-7.2' of https://github.com/norov/linux

2026-06-17T10:38:38Z

Pull bitmap updates from Yury Norov: "This includes the new FIELD_GET_SIGNED() helper, bitmap_print_to_pagebuf() removal, RISCV/bitrev support, and a couple cleanups. - new handy helper FIELD_GET_SIGNED() (Yury) - arch test_and_set_bit_lock() and clear_bit_unlock() cleanup (Randy) - __bf_shf() simplification (Yury) - bitmap_print_to_pagebuf() removal (Yury) - RISCV/bitrev conditional support (Jindie, Yury)" * tag 'bitmap-for-7.2' of https://github.com/norov/linux: MAINTAINERS: BITOPS: include bitrev.[ch] arch/riscv: Add bitrev.h file to support rev8 and brev8 bitops: Define generic___bitrev8/16/32 for reuse lib/bitrev: Introduce GENERIC_BITREVERSE arch: select HAVE_ARCH_BITREVERSE conditionally on BITREVERSE bitmap: fix find helper documentation bitmap: drop bitmap_print_to_pagebuf() cpumask: switch cpumap_print_to_pagebuf() to using scnprintf() bitfield: wire __bf_shf to __builtin_ctzll bitops: use common function parameter names ptp: switch to using FIELD_GET_SIGNED() rtc: rv3032: switch to using FIELD_GET_SIGNED() wifi: rtw89: switch to using FIELD_GET_SIGNED() iio: mcp9600: switch to using FIELD_GET_SIGNED() iio: pressure: bmp280: switch to using FIELD_GET_SIGNED() iio: magnetometer: yas530: switch to using FIELD_GET_SIGNED() iio: intel_dc_ti_adc: switch to using FIELD_GET_SIGNED() x86/extable: switch to using FIELD_GET_SIGNED() bitfield: add FIELD_GET_SIGNED()

mips: select legacy gpiolib interfaces where used

2026-06-15T10:32:43Z

A few old machines have not been converted away from the old-style gpiolib interfaces. Make these select the new CONFIG_GPIOLIB_LEGACY symbol so the code still works where it is needed but can be left out otherwise. This is the list of all gpio_request() calls in mips: arch/mips/alchemy/devboards/db1000.c: gpio_request(19, "sd0_cd"); arch/mips/alchemy/devboards/db1000.c: gpio_request(20, "sd1_cd"); arch/mips/alchemy/devboards/db1200.c: gpio_request(215, "otg-vbus"); arch/mips/bcm47xx/workarounds.c: err = gpio_request_one(usb_power, GPIOF_OUT_INIT_HIGH, "usb_power"); arch/mips/bcm63xx/boards/board_bcm963xx.c: gpio_request_one(board.ephy_reset_gpio, arch/mips/txx9/rbtx4927/setup.c: gpio_request(15, "sio-dtr"); Most of these should be easy enough to change to modern gpio descriptors or remove if they are no longer in use. Signed-off-by: Arnd Bergmann Reviewed-by: Bartosz Golaszewski Reviewed-by: Linus Walleij Signed-off-by: Thomas Bogendoerfer

MIPS: VDSO: Fold MIPS_CLOCK_VSYSCALL into MIPS_GENERIC_GETTIMEOFDAY

2026-06-09T15:02:10Z

This configuration option exists so "that we don't provide the symbol when there's no possibility of there being a usable clocksource". However it only covers __vdso_gettimeofday() and none of the other vDSO functions which should be affected by the same circumstances.slightly slightly. Remove MIPS_CLOCK_VSYSCALL and fold its usecase into MIPS_GENERIC_GETTIMEOFDAY, which works correctly. Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Cc: Thomas Bogendoerfer Cc: Daniel Lezcano Cc: Thomas Gleixner Cc: Andy Lutomirski Cc: Vincenzo Frascino Cc: Arnd Bergmann Cc: linux-mips@vger.kernel.org Link: https://patch.msgid.link/20260521-vdso-mips-kconfig-v1-9-2f79dcd6c78f@linutronix.de

MIPS: VDSO: Gate microMIPS restriction on GCC version

2026-06-09T15:02:10Z

As explained in the comment, the problematic GOT references are only emitted by old versions of GCC. Limit the restriction to those compilers. Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Cc: Thomas Bogendoerfer Link: https://patch.msgid.link/20260521-vdso-mips-kconfig-v1-8-2f79dcd6c78f@linutronix.de