linux-kernel - [tip: x86/percpu] x86/percpu: Return correct variable from current_top_of

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Date:   Tue, 24 Oct 2023 16:41:07 -0000
From:   "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Uros Bizjak <ubizjak@...il.com>, Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/percpu] x86/percpu: Return correct variable from
 current_top_of_stack()

The following commit has been merged into the x86/percpu branch of tip:

Commit-ID:     0548eb067ed664b93043e033295ca71e3e706245
Gitweb:        https://git.kernel.org/tip/0548eb067ed664b93043e033295ca71e3e706245
Author:        Uros Bizjak <ubizjak@...il.com>
AuthorDate:    Tue, 24 Oct 2023 16:28:14 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 24 Oct 2023 18:37:20 +02:00

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: ed2f752e0e0a ("x86/percpu: Introduce const-qualified const_pcpu_hot to micro-optimize code generation")
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20231024142830.3226-1-ubizjak@gmail.com
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/include/asm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index b47a997..f20e876 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -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);
 }