Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=linux-7.0.y 2025-09-20T07:55:56+00:00 2025-09-20T07:55:56+00:00 Yao Zi ziyao@disroot.org 2025-09-19T12:58:29+00:00 urn:sha1:3ec09344b01a15901ba824e877a0562ed8103e27 After LoongArch was converted to use the generic TIF bits in commit f9629891d407 ("loongarch: Use generic TIF bits"), its TIF_FIXADE flag takes the same bit with TIF_RESTORE_SIGMASK in thread_info.flags. Such conflict causes TIF_FIXADE being considered cleared when TIF_RESTORE_SIGMASK is cleared during deliver of a signal. And since TIF_FIXADE determines whether unaligned access emulation works for a task, userspace making use of unaligned access will receive unexpected SIGBUS (and likely terminate) after receiving its first signal. This conflict looks like a simple typo, switch it to the free bit 19. Fixes: f9629891d407 ("loongarch: Use generic TIF bits") Signed-off-by: Yao Zi <ziyao@disroot.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Wentao Guan <guanwentao@uniontech.com> 2025-09-17T06:14:04+00:00 Thomas Gleixner tglx@linutronix.de 2025-09-08T21:32:36+00:00 urn:sha1:f9629891d407e455dc1334e1594108c73074fe8b No point in defining generic items and the upcoming RSEQ optimizations are only available with this _and_ the generic entry infrastructure, which is already used by loongarch. So no further action required here. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2025-06-26T12:07:10+00:00 Thomas Huth thuth@redhat.com 2025-06-26T12:07:10+00:00 urn:sha1:f0ef0b02af381418973a952867052b12194f9c16 While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This is bad since macros starting with two underscores are names that are reserved by the C language. It can also be very confusing for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's now standardize on the __ASSEMBLER__ macro that is provided by the compilers. This is almost a completely mechanical patch (done with a simple "sed -i" statement), with one comment tweaked manually in the arch/loongarch/include/asm/cpu.h file (it was missing the trailing underscores). Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-11-26T10:06:04+00:00 Huacai Chen chenhuacai@loongson.cn 2024-11-22T07:47:53+00:00 urn:sha1:704f06eeff65f898364981e6803e587cd941a3ed LoongArch has supported PREEMPT_RT now. It uses GENERIC_ENTRY, so just add the TIF bit (TIF_NEED_RESCHED_LAZY) related definitions and select the Kconfig symbol (ARCH_HAS_PREEMPT_LAZY) is enough to make it go. Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-03-11T14:23:47+00:00 Jinyang He hejinyang@loongson.cn 2024-03-11T14:23:47+00:00 urn:sha1:199cc14cb4f1cb8668be45f67af41755ed5f0175 The arch-specified function ftrace_regs_set_instruction_pointer() has been implemented in arch/loongarch/include/asm/ftrace.h, so here only implement arch_stack_walk_reliable() function. Here are the test logs: [root@linux fedora]# cat /proc/cmdline BOOT_IMAGE=/vmlinuz-6.8.0-rc2 root=/dev/sda3 [root@linux fedora]# modprobe livepatch-sample [root@linux fedora]# cat /proc/cmdline this has been live patched [root@linux fedora]# echo 0 > /sys/kernel/livepatch/livepatch_sample/enabled [root@linux fedora]# rmmod livepatch_sample [root@linux fedora]# cat /proc/cmdline BOOT_IMAGE=/vmlinuz-6.8.0-rc2 root=/dev/sda3 [root@linux fedora]# dmesg -t | tail -5 livepatch: enabling patch 'livepatch_sample' livepatch: 'livepatch_sample': starting patching transition livepatch: 'livepatch_sample': patching complete livepatch: 'livepatch_sample': starting unpatching transition livepatch: 'livepatch_sample': unpatching complete Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-09-06T14:53:55+00:00 Qi Hu huqi@loongson.cn 2023-09-06T14:53:55+00:00 urn:sha1:bd3c5798484aa9a08302a844d7a75a2ee3b53d05 Loongson Binary Translation (LBT) is used to accelerate binary translation, which contains 4 scratch registers (scr0 to scr3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). This patch support kernel to save/restore these registers, handle the LBT exception and maintain sigcontext. Signed-off-by: Qi Hu <huqi@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2022-12-14T00:36:11+00:00 Huacai Chen chenhuacai@loongson.cn 2022-12-10T14:39:59+00:00 urn:sha1:61a6fccc0bd2e8030b2672a52ef3f6706b2b2ee4 Loongson-2 series (Loongson-2K500, Loongson-2K1000) don't support unaligned access in hardware, while Loongson-3 series (Loongson-3A5000, Loongson-3C5000) are configurable whether support unaligned access in hardware. This patch add unaligned access emulation for those LoongArch processors without hardware support. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2022-07-29T10:22:32+00:00 WANG Xuerui git@xen0n.name 2022-07-26T15:57:16+00:00 urn:sha1:d8e7f201a4cf148c3801cdc9603963061d28d64f Some of the assembly in the LoongArch port seem to come from a prehistoric time, when the assembler didn't even have support for the ABI names we all come to know and love, thus used raw register numbers which hampered readability. The usages are found with a regex match inside arch/loongarch, then manually adjusted for those non-definitions. Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2022-06-03T12:09:28+00:00 Huacai Chen chenhuacai@loongson.cn 2022-05-31T10:04:11+00:00 urn:sha1:803b0fc5c3f2baa6e54978cd576407896f789b08 Add process management support for LoongArch, including: thread info definition, context switch and process tracing. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>