tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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tools headers: Sync uapi/linux/prctl.h with the kernel source

To pick up the changes in these csets:

5ca243f6e3c30b97 ("prctl: add arch-agnostic prctl()s for indirect branch tracking")
28621ec2d46c6adf ("rseq: Add prctl() to enable time slice extensions")

That don't introduced these new prctls:

$ tools/perf/trace/beauty/prctl_option.sh > before.txt
$ cp include/uapi/linux/prctl.h tools/perf/trace/beauty/include/uapi/linux/prctl.h
$ tools/perf/trace/beauty/prctl_option.sh > after.txt
$ diff -u before.txt after.txt
--- before.txt 2026-02-27 09:07:16.435611457 -0300
+++ after.txt 2026-02-27 09:07:28.189816531 -0300
@@ -73,6 +73,10 @@
[76] = "LOCK_SHADOW_STACK_STATUS",
[77] = "TIMER_CREATE_RESTORE_IDS",
[78] = "FUTEX_HASH",
+ [79] = "RSEQ_SLICE_EXTENSION",
+ [80] = "GET_INDIR_BR_LP_STATUS",
+ [81] = "SET_INDIR_BR_LP_STATUS",
+ [82] = "LOCK_INDIR_BR_LP_STATUS",
};
static const char *prctl_set_mm_options[] = {
[1] = "START_CODE",
$

That now will be used to decode the syscall option and also to compose
filters, for instance:

[root@five ~]# perf trace -e syscalls:sys_enter_prctl --filter option==SET_NAME
0.000 Isolated Servi/3474327 syscalls:sys_enter_prctl(option: SET_NAME, arg2: 0x7f23f13b7aee)
0.032 DOM Worker/3474327 syscalls:sys_enter_prctl(option: SET_NAME, arg2: 0x7f23deb25670)
7.920 :3474328/3474328 syscalls:sys_enter_prctl(option: SET_NAME, arg2: 0x7f23e24fbb10)
7.935 StreamT~s #374/3474328 syscalls:sys_enter_prctl(option: SET_NAME, arg2: 0x7f23e24fb970)
8.400 Isolated Servi/3474329 syscalls:sys_enter_prctl(option: SET_NAME, arg2: 0x7f23e24bab10)
8.418 StreamT~s #374/3474329 syscalls:sys_enter_prctl(option: SET_NAME, arg2: 0x7f23e24ba970)
^C[root@five ~]#

This addresses these perf build warnings:

Warning: Kernel ABI header differences:
diff -u tools/perf/trace/beauty/include/uapi/linux/prctl.h include/uapi/linux/prctl.h

Please see tools/include/uapi/README for further details.

Cc: Deepak Gupta <debug@rivosinc.com>
Cc: Paul Walmsley <pjw@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Arnaldo Carvalho de Melo cfdf6456 0031c068

+37
+37
tools/perf/trace/beauty/include/uapi/linux/prctl.h
··· 386 386 # define PR_FUTEX_HASH_SET_SLOTS 1 387 387 # define PR_FUTEX_HASH_GET_SLOTS 2 388 388 389 + /* RSEQ time slice extensions */ 390 + #define PR_RSEQ_SLICE_EXTENSION 79 391 + # define PR_RSEQ_SLICE_EXTENSION_GET 1 392 + # define PR_RSEQ_SLICE_EXTENSION_SET 2 393 + /* 394 + * Bits for RSEQ_SLICE_EXTENSION_GET/SET 395 + * PR_RSEQ_SLICE_EXT_ENABLE: Enable 396 + */ 397 + # define PR_RSEQ_SLICE_EXT_ENABLE 0x01 398 + 399 + /* 400 + * Get the current indirect branch tracking configuration for the current 401 + * thread, this will be the value configured via PR_SET_INDIR_BR_LP_STATUS. 402 + */ 403 + #define PR_GET_INDIR_BR_LP_STATUS 80 404 + 405 + /* 406 + * Set the indirect branch tracking configuration. PR_INDIR_BR_LP_ENABLE will 407 + * enable cpu feature for user thread, to track all indirect branches and ensure 408 + * they land on arch defined landing pad instruction. 409 + * x86 - If enabled, an indirect branch must land on an ENDBRANCH instruction. 410 + * arch64 - If enabled, an indirect branch must land on a BTI instruction. 411 + * riscv - If enabled, an indirect branch must land on an lpad instruction. 412 + * PR_INDIR_BR_LP_DISABLE will disable feature for user thread and indirect 413 + * branches will no more be tracked by cpu to land on arch defined landing pad 414 + * instruction. 415 + */ 416 + #define PR_SET_INDIR_BR_LP_STATUS 81 417 + # define PR_INDIR_BR_LP_ENABLE (1UL << 0) 418 + 419 + /* 420 + * Prevent further changes to the specified indirect branch tracking 421 + * configuration. All bits may be locked via this call, including 422 + * undefined bits. 423 + */ 424 + #define PR_LOCK_INDIR_BR_LP_STATUS 82 425 + 389 426 #endif /* _LINUX_PRCTL_H */