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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/tools/testing/selftests/x86/mov_ss_trap.c
.. .. @@ -257,7 +257,8 @@
257 257  			err(1, "sigaltstack");
258 258  		sethandler(SIGSEGV, handle_and_longjmp, SA_RESETHAND | SA_ONSTACK);
259 259  		nr = SYS_getpid;
260 -		asm volatile ("mov %[ss], %%ss; SYSENTER" : "+a" (nr)
260 +		/* Clear EBP first to make sure we segfault cleanly. */
261 +		asm volatile ("xorl %%ebp, %%ebp; mov %[ss], %%ss; SYSENTER" : "+a" (nr)
261 262  			      : [ss] "m" (ss) : "flags", "rcx"
262 263  #ifdef __x86_64__
263 264  				, "r11"

..	..	@@ -257,7 +257,8 @@
257	257	err(1, "sigaltstack");
258	258	sethandler(SIGSEGV, handle_and_longjmp, SA_RESETHAND \| SA_ONSTACK);
259	259	nr = SYS_getpid;
260		- asm volatile ("mov %[ss], %%ss; SYSENTER" : "+a" (nr)
	260	+ /* Clear EBP first to make sure we segfault cleanly. */
	261	+ asm volatile ("xorl %%ebp, %%ebp; mov %[ss], %%ss; SYSENTER" : "+a" (nr)
261	262	: [ss] "m" (ss) : "flags", "rcx"
262	263	#ifdef __x86_64__
263	264	, "r11"