Code calling this from noinstr sections, e.g. entry code, has interrupts disabled, so the actual call into the scheduler code does not happen.
The objtool section check complains nevertheless, so mark the call "safe". Signed-off-by: Thomas Gleixner <t...@linutronix.de> --- arch/x86/entry/thunk_64.S | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) --- a/arch/x86/entry/thunk_64.S +++ b/arch/x86/entry/thunk_64.S @@ -12,6 +12,7 @@ #include <asm/irqflags.h> .code64 +.section .noinstr.text, "ax" /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ .macro THUNK name, func, put_ret_addr_in_rdi=0, check_if=0 @@ -49,10 +50,24 @@ SYM_FUNC_START_NOALIGN(\name) movq 8(%rbp), %rdi .endif + /* + * noinstr callers will have interrupts disabled and will thus + * not get here. Annotate the call as objtool does not know about + * this and would complain about leaving the noinstr section. + */ +1: + .pushsection .discard.instr_begin + .long 1b - . + .popsection + call \func +2: + .pushsection .discard.instr_end + .long 2b - . + .popsection + jmp .L_restore SYM_FUNC_END(\name) - _ASM_NOKPROBE(\name) .endm #ifdef CONFIG_TRACE_IRQFLAGS @@ -82,6 +97,5 @@ SYM_CODE_START_LOCAL_NOALIGN(.L_restore) popq %rdi popq %rbp ret - _ASM_NOKPROBE(.L_restore) SYM_CODE_END(.L_restore) #endif