kernel/linux.git/arch/riscv, branch v6.19.11

kbuild: Split .modinfo out from ELF_DETAILS

2026-03-12T11:09:39+00:00

commit 8678591b47469fe16357234efef9b260317b8be4 upstream. Commit 3e86e4d74c04 ("kbuild: keep .modinfo section in vmlinux.unstripped") added .modinfo to ELF_DETAILS while removing it from COMMON_DISCARDS, as it was needed in vmlinux.unstripped and ELF_DETAILS was present in all architecture specific vmlinux linker scripts. While this shuffle is fine for vmlinux, ELF_DETAILS and COMMON_DISCARDS may be used by other linker scripts, such as the s390 and x86 compressed boot images, which may not expect to have a .modinfo section. In certain circumstances, this could result in a bootloader failing to load the compressed kernel [1]. Commit ddc6cbef3ef1 ("s390/boot/vmlinux.lds.S: Ensure bzImage ends with SecureBoot trailer") recently addressed this for the s390 bzImage but the same bug remains for arm, parisc, and x86. The presence of .modinfo in the x86 bzImage was the root cause of the issue worked around with commit d50f21091358 ("kbuild: align modinfo section for Secureboot Authenticode EDK2 compat"). misc.c in arch/x86/boot/compressed includes lib/decompress_unzstd.c, which in turn includes lib/xxhash.c and its MODULE_LICENSE / MODULE_DESCRIPTION macros due to the STATIC definition. Split .modinfo out from ELF_DETAILS into its own macro and handle it in all vmlinux linker scripts. Discard .modinfo in the places where it was previously being discarded from being in COMMON_DISCARDS, as it has never been necessary in those uses. Cc: stable@vger.kernel.org Fixes: 3e86e4d74c04 ("kbuild: keep .modinfo section in vmlinux.unstripped") Reported-by: Ed W Closes: https://lore.kernel.org/587f25e0-a80e-46a5-9f01-87cb40cfa377@wildgooses.com/ [1] Tested-by: Ed W # x86_64 Link: https://patch.msgid.link/20260225-separate-modinfo-from-elf-details-v1-1-387ced6baf4b@kernel.org Signed-off-by: Nathan Chancellor Signed-off-by: Greg Kroah-Hartman

riscv: vector: init vector context with proper vlenb

2026-03-04T12:20:35+00:00

[ Upstream commit ef3ff40346db8476a9ef7269fc9d1837e7243c40 ] The vstate in thread_struct is zeroed when the vector context is initialized. That includes read-only register vlenb, which holds the vector register length in bytes. Zeroed state persists until mstatus.VS becomes 'dirty' and a context switch saves the actual hardware values. This can expose the zero vlenb value to the user-space in early debug scenarios, e.g. when ptrace attaches to a traced process early, before any vector instruction except the first one was executed. Fix this by specifying proper vlenb on vector context init. Signed-off-by: Sergey Matyukevich Reviewed-by: Andy Chiu Tested-by: Andy Chiu Link: https://patch.msgid.link/20251214163537.1054292-3-geomatsi@gmail.com Signed-off-by: Paul Walmsley Signed-off-by: Sasha Levin

riscv: dts: sophgo: cv180x: fix USB dwc2 FIFO sizes

2026-02-26T23:00:50+00:00

[ Upstream commit 03ea8676919af21b99bea01f18ef1a271d19f92f ] I've tested the current dwc2 FIFO configuration and found that USB device mode breaks in ECM mode when transmitting frames larger than 128 bytes. For example, large ICMP packets or iperf3 traffic cause the USB link to hang and eventually disconnect without any messages in dmesg. After switching to more conservative FIFO sizes, ECM becomes stable and no longer drops the connection. iperf3 now shows ~130 Mbit/s RX and ~100 Mbit/s TX on SG2002 (MilkV Duo 256M). Fix the FIFO sizes accordingly. Signed-off-by: Anton D. Stavinskii Reviewed-by: Inochi Amaoto Fixes: e307248a3c2d ("riscv: dts: sophgo: Add USB support for cv18xx") Link: https://lore.kernel.org/r/20251126172115.1894190-2-stavinsky@gmail.com Signed-off-by: Inochi Amaoto Signed-off-by: Chen Wang Signed-off-by: Chen Wang Signed-off-by: Sasha Levin

riscv: compat: fix COMPAT_UTS_MACHINE definition

2026-01-29T07:59:17+00:00

The COMPAT_UTS_MACHINE for riscv was incorrectly defined as "riscv". Change it to "riscv32" to reflect the correct 32-bit compat name. Fixes: 06d0e3723647 ("riscv: compat: Add basic compat data type implementation") Cc: stable@vger.kernel.org Signed-off-by: Han Gao Reviewed-by: Guo Ren (Alibaba Damo Academy) Link: https://patch.msgid.link/20260127190711.2264664-1-gaohan@iscas.ac.cn Signed-off-by: Paul Walmsley

errata/sifive: remove unreliable warn_miss_errata

2026-01-26T04:09:04+00:00

When both the SiFive and MIPS errata are enabled then sifive_errata_patch_func emits a wrong and misleading warning claiming that the SiFive errata haven't been applied. This happens because sifive_errata_patch_func is being called twice, once for the kernel image and once for the vdso image. The vdso image has alternative entries for the MIPS errata, but none for the SiFive errata. Signed-off-by: Andreas Schwab Link: https://patch.msgid.link/mvmv7i8q8gg.fsf@suse.de Signed-off-by: Paul Walmsley

riscv: fix minor typo in syscall.h comment

2026-01-26T04:08:59+00:00

Some developers may be confused because RISC-V does not have a register named r0. Also, orig_r0 is not available in pt_regs structure, which is specific to riscv. So we had better fix this minor typo. Signed-off-by: Austin Kim Link: https://patch.msgid.link/aW3Z4zTBvGJpk7a7@adminpc-PowerEdge-R7525 Signed-off-by: Paul Walmsley

riscv: signal: fix some warnings reported by sparse

2026-01-26T04:08:53+00:00

Clean up a few warnings reported by sparse in arch/riscv/kernel/signal.c. These come from code that was added recently; they were missed when I initially reviewed the patch. Fixes: 818d78ba1b3f ("riscv: signal: abstract header saving for setup_sigcontext") Cc: Andy Chiu Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601171848.ydLTJYrz-lkp@intel.com/ [pjw@kernel.org: updated to apply] Signed-off-by: Paul Walmsley

Merge tag 'riscv-for-linus-6.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

2026-01-25T02:55:48+00:00

Pull RISC-V fixes from Paul Walmsley: "The notable changes here are the three RISC-V timer compare register update sequence patches. These only apply to RV32 systems and are related to the 64-bit timer compare value being split across two separate 32-bit registers. We weren't using the appropriate three-write sequence, documented in the RISC-V ISA specifications, to avoid spurious timer interrupts during the update sequence; so, these patches now use the recommended sequence. This doesn't affect 64-bit RISC-V systems, since the timer compare value fits inside a single register and can be updated with a single write. - Fix the RISC-V timer compare register update sequence on RV32 systems to use the recommended sequence in the RISC-V ISA manual This avoids spurious interrupts during updates - Add a dependence on the new CONFIG_CACHEMAINT_FOR_DMA Kconfig symbol for Renesas and StarFive RISC-V SoCs - Add a temporary workaround for a Clang compiler bug caused by using asm_goto_output for get_user() - Clarify our documentation to specifically state a particular ISA specification version for a chapter number reference" * tag 'riscv-for-linus-6.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: riscv: Add intermediate cast to 'unsigned long' in __get_user_asm riscv: Use 64-bit variable for output in __get_user_asm soc: renesas: Fix missing dependency on new CONFIG_CACHEMAINT_FOR_DMA riscv: ERRATA_STARFIVE_JH7100: Fix missing dependency on new CONFIG_CACHEMAINT_FOR_DMA riscv: suspend: Fix stimecmp update hazard on RV32 riscv: kvm: Fix vstimecmp update hazard on RV32 riscv: clocksource: Fix stimecmp update hazard on RV32 Documentation: riscv: uabi: Clarify ISA spec version for canonical order

riscv: Add intermediate cast to 'unsigned long' in __get_user_asm

2026-01-23T03:21:14+00:00

After commit bdce162f2e57 ("riscv: Use 64-bit variable for output in __get_user_asm"), there is a warning when building for 32-bit RISC-V: In file included from include/linux/uaccess.h:13, from include/linux/sched/task.h:13, from include/linux/sched/signal.h:9, from include/linux/rcuwait.h:6, from include/linux/mm.h:36, from include/linux/migrate.h:5, from mm/migrate.c:16: mm/migrate.c: In function 'do_pages_move': arch/riscv/include/asm/uaccess.h:115:15: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 115 | (x) = (__typeof__(x))__tmp; \ | ^ arch/riscv/include/asm/uaccess.h:198:17: note: in expansion of macro '__get_user_asm' 198 | __get_user_asm("lb", (x), __gu_ptr, label); \ | ^~~~~~~~~~~~~~ arch/riscv/include/asm/uaccess.h:218:9: note: in expansion of macro '__get_user_nocheck' 218 | __get_user_nocheck(x, ptr, __gu_failed); \ | ^~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/uaccess.h:255:9: note: in expansion of macro '__get_user_error' 255 | __get_user_error(__gu_val, __gu_ptr, __gu_err); \ | ^~~~~~~~~~~~~~~~ arch/riscv/include/asm/uaccess.h:285:17: note: in expansion of macro '__get_user' 285 | __get_user((x), __p) : \ | ^~~~~~~~~~ mm/migrate.c:2358:29: note: in expansion of macro 'get_user' 2358 | if (get_user(p, pages + i)) | ^~~~~~~~ Add an intermediate cast to 'unsigned long', which is guaranteed to be the same width as a pointer, before the cast to the type of the output variable to clear up the warning. Fixes: bdce162f2e57 ("riscv: Use 64-bit variable for output in __get_user_asm") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601210526.OT45dlOZ-lkp@intel.com/ Signed-off-by: Nathan Chancellor Link: https://patch.msgid.link/20260121-riscv-fix-int-to-pointer-cast-v1-1-b83eebe57c76@kernel.org Signed-off-by: Paul Walmsley

riscv: Use 64-bit variable for output in __get_user_asm

2026-01-17T01:05:47+00:00

After commit f6bff7827a48 ("riscv: uaccess: use 'asm_goto_output' for get_user()"), which was the first commit that started using asm goto with outputs on RISC-V, builds of clang built with assertions enabled start crashing in certain files that use get_user() with: clang: llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:12743: Register FollowCopyChain(MachineRegisterInfo &, Register): Assertion `MI->getOpcode() == TargetOpcode::COPY && "start of copy chain MUST be COPY"' failed. Internally, LLVM generates an addiw instruction when the output of the inline asm (which may be any scalar type) needs to be sign extended for ABI reasons, such as a later function call, so that basic block does not have to do it. Use a temporary 64-bit variable as the output of the inline assembly in __get_user_asm() and explicitly cast it to truncate it if necessary, avoiding the addiw that triggers the assertion. Link: https://github.com/ClangBuiltLinux/linux/issues/2092 Signed-off-by: Nathan Chancellor Link: https://patch.msgid.link/20260116-riscv-wa-llvm-asm-goto-outputs-assertion-failure-v3-1-55b5775f989b@kernel.org Signed-off-by: Paul Walmsley