In order to have the same effect on registers as a call to check_for_livepatch_work() may have, clobber all call-clobbered registers in debug builds.
Signed-off-by: Jan Beulich <jbeul...@suse.com> --- v2: New. --- a/xen/include/asm-x86/current.h +++ b/xen/include/asm-x86/current.h @@ -120,6 +120,14 @@ unsigned long get_stack_dump_bottom (uns #ifdef CONFIG_LIVEPATCH # define CHECK_FOR_LIVEPATCH_WORK "call check_for_livepatch_work;" +#elif defined(CONFIG_DEBUG) +/* Mimic the clobbering effect a call has on registers. */ +# define CHECK_FOR_LIVEPATCH_WORK \ + "mov $0x1234567890abcdef, %%rax\n\t" \ + "mov %%rax, %%rcx; mov %%rax, %%rdx\n\t" \ + "mov %%rax, %%rsi; mov %%rax, %%rdi\n\t" \ + "mov %%rax, %%r8; mov %%rax, %%r9\n\t" \ + "mov %%rax, %%r10; mov %%rax, %%r11\n\t" #else # define CHECK_FOR_LIVEPATCH_WORK "" #endif