linux-kernel - [PATCH V8 24/44] x86/entry: Define arch_{save|restore}_auxiliary_pt

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Date:   Thu, 27 Jan 2022 09:54:45 -0800
From:   ira.weiny@...el.com
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Ira Weiny <ira.weiny@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V8 24/44] x86/entry: Define arch_{save|restore}_auxiliary_pt_regs()

From: Ira Weiny <ira.weiny@...el.com>

The x86 architecture supports the new auxiliary pt_regs space if
ARCH_HAS_PTREGS_AUXILIARY is enabled.

Define the callbacks within the x86 code required by the core entry code
when this support is enabled.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes for V8
	New patch
---
 arch/x86/include/asm/entry-common.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/entry-common.h b/arch/x86/include/asm/entry-common.h
index 43184640b579..5fa5dd2d539c 100644
--- a/arch/x86/include/asm/entry-common.h
+++ b/arch/x86/include/asm/entry-common.h
@@ -95,4 +95,16 @@ static __always_inline void arch_exit_to_user_mode(void)
 }
 #define arch_exit_to_user_mode arch_exit_to_user_mode
 
+#ifdef CONFIG_ARCH_HAS_PTREGS_AUXILIARY
+
+static inline void arch_save_aux_pt_regs(struct pt_regs *regs)
+{
+}
+
+static inline void arch_restore_aux_pt_regs(struct pt_regs *regs)
+{
+}
+
+#endif
+
 #endif
-- 
2.31.1