4.19-stable review patch. If anyone has any objections, please let me know.
------------------ From: Josh Poimboeuf <[email protected]> commit f76a16adc485699f95bb71fce114f97c832fe664 upstream. The .orc_unwind section is a packed array of 6-byte structs. It's currently aligned to 6 bytes, which is causing warnings in the LLD linker. Six isn't a power of two, so it's not a valid alignment value. The actual alignment doesn't matter much because it's an array of packed structs. An alignment of two is sufficient. In reality it always gets aligned to four bytes because it comes immediately after the 4-byte-aligned .orc_unwind_ip section. Fixes: ee9f8fce9964 ("x86/unwind: Add the ORC unwinder") Reported-by: Nick Desaulniers <[email protected]> Reported-by: Dmitry Golovin <[email protected]> Reported-by: Sedat Dilek <[email protected]> Signed-off-by: Josh Poimboeuf <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Tested-by: Sedat Dilek <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: [email protected] Link: https://github.com/ClangBuiltLinux/linux/issues/218 Link: https://lkml.kernel.org/r/d55027ee95fe73e952dcd8be90aebd31b0095c45.1551892041.git.jpoim...@redhat.com Signed-off-by: Greg Kroah-Hartman <[email protected]> --- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -727,7 +727,7 @@ KEEP(*(.orc_unwind_ip)) \ __stop_orc_unwind_ip = .; \ } \ - . = ALIGN(6); \ + . = ALIGN(2); \ .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ __start_orc_unwind = .; \ KEEP(*(.orc_unwind)) \
