diff options
| author | Jens Remus <jremus@linux.ibm.com> | 2025-12-08 17:03:50 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-12-17 13:31:07 +0100 |
| commit | 2652f9a4b019e34fbbde8dcd1396f1f00ec4844f (patch) | |
| tree | 3e319f985fbb0671615e84034041b48b5195be4c /arch/x86 | |
| parent | 2d6ad925fb2386f3ee1d26f5022f7ea71bbc1541 (diff) | |
unwind_user/fp: Use dummies instead of ifdef
This simplifies the code. unwind_user_next_fp() does not need to
return -EINVAL if config option HAVE_UNWIND_USER_FP is disabled, as
unwind_user_start() will then not select this unwind method and
unwind_user_next() will therefore not call it.
Provide (1) a dummy definition of ARCH_INIT_USER_FP_FRAME, if the unwind
user method HAVE_UNWIND_USER_FP is not enabled, (2) a common fallback
definition of unwind_user_at_function_start() which returns false, and
(3) a common dummy definition of ARCH_INIT_USER_FP_ENTRY_FRAME.
Note that enabling the config option HAVE_UNWIND_USER_FP without
defining ARCH_INIT_USER_FP_FRAME triggers a compile error, which is
helpful when implementing support for this unwind user method in an
architecture. Enabling the config option when providing an arch-
specific unwind_user_at_function_start() definition makes it necessary
to also provide an arch-specific ARCH_INIT_USER_FP_ENTRY_FRAME
definition.
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251208160352.1363040-3-jremus@linux.ibm.com
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/unwind_user.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/unwind_user.h b/arch/x86/include/asm/unwind_user.h index 12064284bc4e..971ffe937d50 100644 --- a/arch/x86/include/asm/unwind_user.h +++ b/arch/x86/include/asm/unwind_user.h @@ -35,6 +35,7 @@ static inline bool unwind_user_at_function_start(struct pt_regs *regs) { return is_uprobe_at_func_entry(regs); } +#define unwind_user_at_function_start unwind_user_at_function_start #endif /* CONFIG_HAVE_UNWIND_USER_FP */ |