linux-kernel - [PATCH 51/79] [PATCH] don't span a new worker in __smp_prepare

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Message-Id: <12059478062779-git-send-email-gcosta@redhat.com>
Date:	Wed, 19 Mar 2008 14:25:46 -0300
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu,
	ak@...e.de, Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 51/79] [PATCH] don't span a new worker in __smp_prepare_cpu

From: Glauber Costa <gcosta@...hat.com>

We can do it now that do_boot_cpu has its own worker.

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/smpboot_32.c |   30 ++----------------------------
 1 files changed, 2 insertions(+), 28 deletions(-)

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index fc1eb52..c03596e 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -699,44 +699,18 @@ void cpu_exit_clear(void)
 }
 #endif
 
-struct warm_boot_cpu_info {
-	struct completion *complete;
-	struct work_struct task;
-	int apicid;
-	int cpu;
-};
-
-static void __cpuinit do_warm_boot_cpu(struct work_struct *work)
-{
-	struct warm_boot_cpu_info *info =
-		container_of(work, struct warm_boot_cpu_info, task);
-	do_boot_cpu(info->apicid, info->cpu);
-	complete(info->complete);
-}
-
 static void __cpuinit __smp_prepare_cpu(int cpu)
 {
-	DECLARE_COMPLETION_ONSTACK(done);
-	struct warm_boot_cpu_info info;
 	int	apicid;
 
 	apicid = per_cpu(x86_cpu_to_apicid, cpu);
 
-	info.complete = &done;
-	info.apicid = apicid;
-	info.cpu = cpu;
-	INIT_WORK(&info.task, do_warm_boot_cpu);
-
 	/* init low mem mapping */
 	clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
 			min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS));
 	flush_tlb_all();
-	if (!keventd_up() || current_is_keventd())
-		info.task.func(&info.task);
-	else {
-		schedule_work(&info.task);
-		wait_for_completion(&done);
-	}
+
+	do_boot_cpu(apicid, cpu);
 }
 
 static int boot_cpu_logical_apicid;
-- 
1.5.0.6

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