linux-kernel - [patch 2/5] common entry: add hook for isolation to __syscall_exit_to_user_mode

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Date:   Fri, 09 Jul 2021 14:37:28 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Christoph Lameter <cl@...ux.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Nitesh Lal <nilal@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nicolas Saenz <nsaenzju@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [patch 2/5] common entry: add hook for isolation to __syscall_exit_to_user_mode_work

This hook will be used by the next patch to perform synchronization
of per-CPU vmstats.

Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

Index: linux-2.6-vmstat-update/kernel/entry/common.c
===================================================================
--- linux-2.6-vmstat-update.orig/kernel/entry/common.c
+++ linux-2.6-vmstat-update/kernel/entry/common.c
@@ -284,9 +284,18 @@ static void syscall_exit_to_user_mode_pr
 		syscall_exit_work(regs, work);
 }
 
+/*
+ * Isolaton specific exit to user mode preparation. Runs with interrupts
+ * enabled.
+ */
+static void isolation_exit_to_user_mode_prepare(void)
+{
+}
+
 static __always_inline void __syscall_exit_to_user_mode_work(struct pt_regs *regs)
 {
 	syscall_exit_to_user_mode_prepare(regs);
+	isolation_exit_to_user_mode_prepare();
 	local_irq_disable_exit_to_user();
 	exit_to_user_mode_prepare(regs);
 }