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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2019-07-18 03:36:41 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-07-18 21:01:04 +0200 |
| commit | 61a73f5cd1a5794626d216cc56e20a1b195c5d0c (patch) | |
| tree | 13f5a3feb0a9e6bb5b9a1b8e1563597f47d600bf /arch | |
| parent | x86/entry: Fix thunk function ELF sizes (diff) | |
| download | linux-61a73f5cd1a5794626d216cc56e20a1b195c5d0c.tar.xz linux-61a73f5cd1a5794626d216cc56e20a1b195c5d0c.zip | |
x86/head/64: Annotate start_cpu0() as non-callable
After an objtool improvement, it complains about the fact that
start_cpu0() jumps to code which has an LRET instruction.
arch/x86/kernel/head_64.o: warning: objtool: .head.text+0xe4: unsupported instruction in callable function
Technically, start_cpu0() is callable, but it acts nothing like a
callable function. Prevent objtool from treating it like one by
removing its ELF function annotation.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/6b1b4505fcb90571a55fa1b52d71fb458ca24454.1563413318.git.jpoimboe@redhat.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/head_64.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index bcd206c8ac90..66b4a7757397 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -253,10 +253,10 @@ END(secondary_startup_64) * start_secondary() via .Ljump_to_C_code. */ ENTRY(start_cpu0) - movq initial_stack(%rip), %rsp UNWIND_HINT_EMPTY + movq initial_stack(%rip), %rsp jmp .Ljump_to_C_code -ENDPROC(start_cpu0) +END(start_cpu0) #endif /* Both SMP bootup and ACPI suspend change these variables */ |