| Message ID | 20161010125709.1870563-1-arnd@arndb.de |
|---|---|
| State | New |
| Headers | show |
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 2d449337a360..e1dfb37d66ad 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -110,7 +110,7 @@ else cflags-$(CONFIG_MCORE2) += \ $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ - $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) + $(call cc-option,-mtune=generic) cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) KBUILD_CFLAGS += $(cflags-y)
I have no idea what is actually going on here, but building an x86 kernel with CONFIG_MATOM results in countless warnings from objtool, such as arch/x86/events/intel/ds.o: warning: objtool: intel_pmu_pebs_del()+0x43: call without frame pointer save/setup security/keys/keyring.o: warning: objtool: keyring_read()+0x59: call without frame pointer save/setup kernel/signal.o: warning: objtool: __dequeue_signal()+0xd8: call without frame pointer save/setup kernel/signal.o: warning: objtool: kill_pid()+0x15: call without frame pointer save/setup kernel/signal.o: warning: objtool: SyS_signal()+0x27: call without frame pointer save/setup mm/page_alloc.o: warning: objtool: zone_watermark_ok_safe()+0x27: call without frame pointer save/setup fs/exec.o: warning: objtool: read_code()+0x18: call without frame pointer save/setup mm/swap.o: warning: objtool: get_kernel_page()+0x24: call without frame pointer save/setup mm/swap.o: warning: objtool: pagevec_move_tail.constprop.25()+0x26: call without frame pointer save/setup block/bio.o: warning: objtool: bio_map_kern()+0x47: call without frame pointer save/setup arch/x86/crypto/poly1305_glue.o: warning: objtool: poly1305_simd_mult()+0x2d: call without frame pointer save/setup crypto/skcipher.o: warning: objtool: skcipher_encrypt_ablkcipher()+0x58: call without frame pointer save/setup crypto/skcipher.o: warning: objtool: skcipher_decrypt_ablkcipher()+0x58: call without frame pointer save/setup fs/inode.o: warning: objtool: ilookup()+0x5d: call without frame pointer save/setup fs/inode.o: warning: objtool: proc_nr_inodes()+0x3e: call without frame pointer save/setup fs/namei.o: warning: objtool: lookup_one_len_unlocked()+0x21: call without frame pointer save/setup block/elevator.o: warning: objtool: elv_rb_add()+0x5b: call without frame pointer save/setup crypto/shash.o: warning: objtool: shash_async_init()+0x1e: call without frame pointer save/setup crypto/shash.o: warning: objtool: shash_async_import()+0x1e: call without frame pointer save/setup mm/vmscan.o: warning: objtool: pfmemalloc_watermark_ok()+0xb9: call without frame pointer save/setup I have not looked at whether this is a bug in gcc or in objtool, however I found that not using -mtune=atom reliably avoids the problem. I could reproduce the problem with gcc versions 4.7 through 6.1. Cc: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/x86/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.9.0