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Message-Id: <20221020113619.17204-1-jgross@suse.com>
Date: Thu, 20 Oct 2022 13:36:19 +0200
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Juergen Gross <jgross@...e.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>, xen-devel@...ts.xenproject.org
Subject: [PATCH] x86/xen: simplify sysenter and syscall setup
xen_enable_sysenter() and xen_enable_syscall() can be simplified a lot.
Signed-off-by: Juergen Gross <jgross@...e.com>
---
arch/x86/xen/setup.c | 23 ++++++-----------------
1 file changed, 6 insertions(+), 17 deletions(-)
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index cfa99e8f054b..0f33ed6d3a7b 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -910,17 +910,9 @@ static int register_callback(unsigned type, const void *func)
void xen_enable_sysenter(void)
{
- int ret;
- unsigned sysenter_feature;
-
- sysenter_feature = X86_FEATURE_SYSENTER32;
-
- if (!boot_cpu_has(sysenter_feature))
- return;
-
- ret = register_callback(CALLBACKTYPE_sysenter, xen_entry_SYSENTER_compat);
- if(ret != 0)
- setup_clear_cpu_cap(sysenter_feature);
+ if (boot_cpu_has(X86_FEATURE_SYSENTER32) &&
+ register_callback(CALLBACKTYPE_sysenter, xen_entry_SYSENTER_compat))
+ setup_clear_cpu_cap(X86_FEATURE_SYSENTER32);
}
void xen_enable_syscall(void)
@@ -934,12 +926,9 @@ void xen_enable_syscall(void)
mechanism for syscalls. */
}
- if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
- ret = register_callback(CALLBACKTYPE_syscall32,
- xen_entry_SYSCALL_compat);
- if (ret != 0)
- setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
- }
+ if (boot_cpu_has(X86_FEATURE_SYSCALL32) &&
+ register_callback(CALLBACKTYPE_syscall32, xen_entry_SYSCALL_compat))
+ setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
}
static void __init xen_pvmmu_arch_setup(void)
--
2.35.3
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