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2652f9a4b0
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
29 lines
649 B
C
29 lines
649 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_UNWIND_USER_H
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#define _LINUX_UNWIND_USER_H
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#include <linux/unwind_user_types.h>
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#include <asm/unwind_user.h>
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#ifndef CONFIG_HAVE_UNWIND_USER_FP
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#define ARCH_INIT_USER_FP_FRAME(ws)
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#endif
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#ifndef ARCH_INIT_USER_FP_ENTRY_FRAME
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#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws)
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#endif
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#ifndef unwind_user_at_function_start
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static inline bool unwind_user_at_function_start(struct pt_regs *regs)
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{
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return false;
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}
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#define unwind_user_at_function_start unwind_user_at_function_start
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#endif
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int unwind_user(struct unwind_stacktrace *trace, unsigned int max_entries);
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#endif /* _LINUX_UNWIND_USER_H */
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