Commit 0548eb06 authored by Uros Bizjak's avatar Uros Bizjak Committed by Ingo Molnar
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x86/percpu: Return correct variable from current_top_of_stack() 



current_top_of_stack() should return variable from _seg_gs
qualified named address space when CONFIG_USE_X86_SEG_SUPPORT=y
is enbled.

Fixes: ed2f752e ("x86/percpu: Introduce const-qualified const_pcpu_hot to micro-optimize code generation")
Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231024142830.3226-1-ubizjak@gmail.com
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
parent ed2f752e

arch/x86/include/asm/processor.h

+1 −1
Original line number Diff line number Diff line
@@ -519,7 +519,7 @@ static __always_inline unsigned long current_top_of_stack(void) 
	 *  entry trampoline.

	 */

	if (IS_ENABLED(CONFIG_USE_X86_SEG_SUPPORT))

		return pcpu_hot.top_of_stack;

		return const_pcpu_hot.top_of_stack;



	return this_cpu_read_stable(pcpu_hot.top_of_stack);

}