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 --- drivers/hid/hid-razer.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 drivers/hid/hid-razer.c (limited to 'drivers/hid/hid-razer.c') diff --git a/drivers/hid/hid-razer.c b/drivers/hid/hid-razer.c new file mode 100644 index 000000000..7f48258c6 --- /dev/null +++ b/drivers/hid/hid-razer.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * HID driver for gaming keys on Razer Blackwidow gaming keyboards + * Macro Key Keycodes: M1 = 191, M2 = 192, M3 = 193, M4 = 194, M5 = 195 + * + * Copyright (c) 2021 Jelle van der Waa + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "hid-ids.h" + +#define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c)) + +#define RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE 91 + +static bool macro_key_remapping = 1; +module_param(macro_key_remapping, bool, 0644); +MODULE_PARM_DESC(macro_key_remapping, " on (Y) off (N)"); + + +static unsigned char blackwidow_init[RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE] = { + 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x04, + 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x04, 0x00 +}; + +static int razer_input_mapping(struct hid_device *hdev, + struct hid_input *hi, struct hid_field *field, + struct hid_usage *usage, unsigned long **bit, int *max) +{ + + if (!macro_key_remapping) + return 0; + + if ((usage->hid & HID_UP_KEYBOARD) != HID_UP_KEYBOARD) + return 0; + + switch (usage->hid & ~HID_UP_KEYBOARD) { + case 0x68: + map_key_clear(KEY_MACRO1); + return 1; + case 0x69: + map_key_clear(KEY_MACRO2); + return 1; + case 0x6a: + map_key_clear(KEY_MACRO3); + return 1; + case 0x6b: + map_key_clear(KEY_MACRO4); + return 1; + case 0x6c: + map_key_clear(KEY_MACRO5); + return 1; + } + + return 0; +} + +static int razer_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + char *buf; + int ret = 0; + + ret = hid_parse(hdev); + if (ret) + return ret; + + /* + * Only send the enable macro keys command for the third device + * identified as mouse input. + */ + if (hdev->type == HID_TYPE_USBMOUSE) { + buf = kmemdup(blackwidow_init, RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE, GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + + ret = hid_hw_raw_request(hdev, 0, buf, RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE, + HID_FEATURE_REPORT, HID_REQ_SET_REPORT); + if (ret != RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE) + hid_err(hdev, "failed to enable macro keys: %d\n", ret); + + kfree(buf); + } + + return hid_hw_start(hdev, HID_CONNECT_DEFAULT); +} + +static const struct hid_device_id razer_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, + USB_DEVICE_ID_RAZER_BLACKWIDOW) }, + { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, + USB_DEVICE_ID_RAZER_BLACKWIDOW_CLASSIC) }, + { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, + USB_DEVICE_ID_RAZER_BLACKWIDOW_ULTIMATE) }, + { } +}; +MODULE_DEVICE_TABLE(hid, razer_devices); + +static struct hid_driver razer_driver = { + .name = "razer", + .id_table = razer_devices, + .input_mapping = razer_input_mapping, + .probe = razer_probe, +}; +module_hid_driver(razer_driver); + +MODULE_AUTHOR("Jelle van der Waa "); +MODULE_DESCRIPTION("HID driver for gaming keys on Razer Blackwidow gaming keyboards"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1