tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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x86,xen,objtool: Add UNWIND hint

SYM_CODE_START*() doesn't get auto-validated and needs an UNWIND hint
to get checked, add one.

vmlinux.o: warning: objtool: pvh_start_xen()+0x0: unreachable

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220408094718.321246297@infradead.org

Peter Zijlstra 2730d3c1 226d44ac

+1
+1
arch/x86/platform/pvh/head.S
··· 50 50 #define PVH_DS_SEL (PVH_GDT_ENTRY_DS * 8) 51 51 52 52 SYM_CODE_START_LOCAL(pvh_start_xen) 53 + UNWIND_HINT_EMPTY 53 54 cld 54 55 55 56 lgdt (_pa(gdt))