From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- arch/mips/jazz/setup.c | 201 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 201 insertions(+) create mode 100644 arch/mips/jazz/setup.c (limited to 'arch/mips/jazz/setup.c') diff --git a/arch/mips/jazz/setup.c b/arch/mips/jazz/setup.c new file mode 100644 index 000000000..d21e5d441 --- /dev/null +++ b/arch/mips/jazz/setup.c @@ -0,0 +1,201 @@ +/* + * Setup pointers to hardware-dependent routines. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 1997, 1998, 2001, 07, 08 by Ralf Baechle + * Copyright (C) 2001 MIPS Technologies, Inc. + * Copyright (C) 2007 by Thomas Bogendoerfer + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +extern void jazz_machine_restart(char *command); + +static struct resource jazz_io_resources[] = { + { + .start = 0x00, + .end = 0x1f, + .name = "dma1", + .flags = IORESOURCE_IO | IORESOURCE_BUSY + }, { + .start = 0x40, + .end = 0x5f, + .name = "timer", + .flags = IORESOURCE_IO | IORESOURCE_BUSY + }, { + .start = 0x80, + .end = 0x8f, + .name = "dma page reg", + .flags = IORESOURCE_IO | IORESOURCE_BUSY + }, { + .start = 0xc0, + .end = 0xdf, + .name = "dma2", + .flags = IORESOURCE_IO | IORESOURCE_BUSY + } +}; + +void __init plat_mem_setup(void) +{ + int i; + + /* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */ + add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K); + /* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */ + add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M); + /* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */ + add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M); + + set_io_port_base(JAZZ_PORT_BASE); +#ifdef CONFIG_EISA + EISA_bus = 1; +#endif + + /* request I/O space for devices used on all i[345]86 PCs */ + for (i = 0; i < ARRAY_SIZE(jazz_io_resources); i++) + request_resource(&ioport_resource, jazz_io_resources + i); + + /* The RTC is outside the port address space */ + + _machine_restart = jazz_machine_restart; + + add_preferred_console("ttyS", 0, "9600"); +} + +#ifdef CONFIG_OLIVETTI_M700 +#define UART_CLK 1843200 +#else +/* Some Jazz machines seem to have an 8MHz crystal clock but I don't know + exactly which ones ... XXX */ +#define UART_CLK (8000000 / 16) /* ( 3072000 / 16) */ +#endif + +#define MEMPORT(_base, _irq) \ + { \ + .mapbase = (_base), \ + .membase = (void *)(_base), \ + .irq = (_irq), \ + .uartclk = UART_CLK, \ + .iotype = UPIO_MEM, \ + .flags = UPF_BOOT_AUTOCONF, \ + } + +static struct plat_serial8250_port jazz_serial_data[] = { + MEMPORT(JAZZ_SERIAL1_BASE, JAZZ_SERIAL1_IRQ), + MEMPORT(JAZZ_SERIAL2_BASE, JAZZ_SERIAL2_IRQ), + { }, +}; + +static struct platform_device jazz_serial8250_device = { + .name = "serial8250", + .id = PLAT8250_DEV_PLATFORM, + .dev = { + .platform_data = jazz_serial_data, + }, +}; + +static struct resource jazz_esp_rsrc[] = { + { + .start = JAZZ_SCSI_BASE, + .end = JAZZ_SCSI_BASE + 31, + .flags = IORESOURCE_MEM + }, + { + .start = JAZZ_SCSI_DMA, + .end = JAZZ_SCSI_DMA, + .flags = IORESOURCE_MEM + }, + { + .start = JAZZ_SCSI_IRQ, + .end = JAZZ_SCSI_IRQ, + .flags = IORESOURCE_IRQ + } +}; + +static u64 jazz_esp_dma_mask = DMA_BIT_MASK(32); + +static struct platform_device jazz_esp_pdev = { + .name = "jazz_esp", + .num_resources = ARRAY_SIZE(jazz_esp_rsrc), + .resource = jazz_esp_rsrc, + .dev = { + .dma_mask = &jazz_esp_dma_mask, + .coherent_dma_mask = DMA_BIT_MASK(32), + } +}; + +static struct resource jazz_sonic_rsrc[] = { + { + .start = JAZZ_ETHERNET_BASE, + .end = JAZZ_ETHERNET_BASE + 0xff, + .flags = IORESOURCE_MEM + }, + { + .start = JAZZ_ETHERNET_IRQ, + .end = JAZZ_ETHERNET_IRQ, + .flags = IORESOURCE_IRQ + } +}; + +static u64 jazz_sonic_dma_mask = DMA_BIT_MASK(32); + +static struct platform_device jazz_sonic_pdev = { + .name = "jazzsonic", + .num_resources = ARRAY_SIZE(jazz_sonic_rsrc), + .resource = jazz_sonic_rsrc, + .dev = { + .dma_mask = &jazz_sonic_dma_mask, + .coherent_dma_mask = DMA_BIT_MASK(32), + } +}; + +static struct resource jazz_cmos_rsrc[] = { + { + .start = 0x70, + .end = 0x71, + .flags = IORESOURCE_IO + }, + { + .start = 8, + .end = 8, + .flags = IORESOURCE_IRQ + } +}; + +static struct platform_device jazz_cmos_pdev = { + .name = "rtc_cmos", + .num_resources = ARRAY_SIZE(jazz_cmos_rsrc), + .resource = jazz_cmos_rsrc +}; + +static struct platform_device pcspeaker_pdev = { + .name = "pcspkr", + .id = -1, +}; + +static int __init jazz_setup_devinit(void) +{ + platform_device_register(&jazz_serial8250_device); + platform_device_register(&jazz_esp_pdev); + platform_device_register(&jazz_sonic_pdev); + platform_device_register(&jazz_cmos_pdev); + platform_device_register(&pcspeaker_pdev); + + return 0; +} + +device_initcall(jazz_setup_devinit); -- cgit v1.3.1