linux-kernel - [PATCH 01/37] uprobes: dont pass around current->mm

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Message-Id: <20151117033512.80B0F505@viggo.jf.intel.com>
Date:	Mon, 16 Nov 2015 19:35:12 -0800
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com
Subject: [PATCH 01/37] uprobes: dont pass around current->mm


From: Dave Hansen <dave.hansen@...ux.intel.com>

It doesn't make a whole lot of sense to pass around 'mm' when
there is only one call path and that path passes current->mm in
all sitautions.

Remove 'mm' from one such path in uprobes.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
---

 b/kernel/events/uprobes.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff -puN kernel/events/uprobes.c~uprobes-dont-pass-around-current-mm kernel/events/uprobes.c
--- a/kernel/events/uprobes.c~uprobes-dont-pass-around-current-mm	2015-11-16 12:35:34.870150592 -0800
+++ b/kernel/events/uprobes.c	2015-11-16 12:35:34.874150773 -0800
@@ -1685,7 +1685,7 @@ static void mmf_recalc_uprobes(struct mm
 	clear_bit(MMF_HAS_UPROBES, &mm->flags);
 }
 
-static int is_trap_at_addr(struct mm_struct *mm, unsigned long vaddr)
+static int is_trap_at_addr(unsigned long vaddr)
 {
 	struct page *page;
 	uprobe_opcode_t opcode;
@@ -1699,7 +1699,7 @@ static int is_trap_at_addr(struct mm_str
 	if (likely(result == 0))
 		goto out;
 
-	result = get_user_pages(NULL, mm, vaddr, 1, 0, 1, &page, NULL);
+	result = get_user_pages(NULL, current->mm, vaddr, 1, 0, 1, &page, NULL);
 	if (result < 0)
 		return result;
 
@@ -1727,7 +1727,7 @@ static struct uprobe *find_active_uprobe
 		}
 
 		if (!uprobe)
-			*is_swbp = is_trap_at_addr(mm, bp_vaddr);
+			*is_swbp = is_trap_at_addr(bp_vaddr);
 	} else {
 		*is_swbp = -EFAULT;
 	}
_
--
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