We no longer use current_top_of_stack() on arm64, so it can be removed.
We introduced current_top_of_stack() for STACKLEAK in commit:
0b3e336601b82c6a ("arm64: Add support for STACKLEAK gcc plugin")
... then we figured out the intended semantics were unclear, and
reworked it in commit:
e85094c31ddb794a ("arm64: stackleak: fix current_top_of_stack()")
... then we removed the only user in commit:
0cfa2ccd285d98ad ("stackleak: rework stack high bound handling")
Given that it's no longer used, and it's very easy to misuse, this patch
removes current_top_of_stack(). For the moment, on_thread_stack() is
left where it is as moving it will change some header dependencies.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221117120902.3974163-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
#define GET_TAGGED_ADDR_CTRL() get_tagged_addr_ctrl(current)
#endif
-/*
- * For CONFIG_GCC_PLUGIN_STACKLEAK
- *
- * These need to be macros because otherwise we get stuck in a nightmare
- * of header definitions for the use of task_stack_page.
- */
-
-/*
- * The top of the current task's task stack
- */
-#define current_top_of_stack() ((unsigned long)current->stack + THREAD_SIZE)
#define on_thread_stack() (on_task_stack(current, current_stack_pointer, 1))
#endif /* __ASSEMBLY__ */