linux-kernel - [PATCH 6/9] uprobes: flush cache after xol write

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Message-Id: <1350242593-17761-6-git-send-email-rabin@rab.in>
Date:	Sun, 14 Oct 2012 21:23:10 +0200
From:	Rabin Vincent <rabin@....in>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, oleg@...hat.com,
	Rabin Vincent <rabin@....in>
Subject: [PATCH 6/9] uprobes: flush cache after xol write

Flush the cache so that the instructions written to the XOL area are
visible.

Signed-off-by: Rabin Vincent <rabin@....in>
---
 kernel/events/uprobes.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ca000a9..8c52f93 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1246,6 +1246,7 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe, unsigned long slot
 	offset = current->utask->xol_vaddr & ~PAGE_MASK;
 	vaddr = kmap_atomic(area->page);
 	arch_uprobe_xol_copy(&uprobe->arch, vaddr + offset);
+	flush_dcache_page(area->page);
 	kunmap_atomic(vaddr);
 
 	return current->utask->xol_vaddr;
-- 
1.7.9.5

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