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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2016-03-09 12:59:50 -0600 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-05-10 18:16:50 +0200 |
| commit | 4548f63e65116458da5245d89aa213b4f8b2ab16 (patch) | |
| tree | 8a8de094e1c0052b87f2180398fd5e4f7b4af9e5 /block/ioprio.c | |
| parent | 5e1b59abef69e405eabfbe0ad09ad6b6e5303c7d (diff) | |
| download | linux-4548f63e65116458da5245d89aa213b4f8b2ab16.tar.bz2 | |
x86/kvm: Add stack frame dependency to fastop() inline asm
The kbuild test robot reported this objtool warning [1]:
arch/x86/kvm/emulate.o: warning: objtool: fastop()+0x69: call without frame pointer save/setup
The issue seems to be caused by CONFIG_PROFILE_ALL_BRANCHES. With that
option, for some reason gcc decides not to create a stack frame in
fastop() before doing the inline asm call, which can result in a bad
stack trace.
Force a stack frame to be created if CONFIG_FRAME_POINTER is enabled by
listing the stack pointer as an output operand for the inline asm
statement.
This change has no effect for !CONFIG_PROFILE_ALL_BRANCHES.
[1] https://lists.01.org/pipermail/kbuild-all/2016-March/018249.html
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'block/ioprio.c')
0 files changed, 0 insertions, 0 deletions