The patch titled
Subject: lkdtm: avoid calling lkdtm_do_action() with spinlock held
has been added to the -mm tree. Its filename is
lkdtm-avoid-calling-lkdtm_do_action-with-spin-lock-held.patch
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------------------------------------------------------
From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Subject: lkdtm: avoid calling lkdtm_do_action() with spinlock held
lkdtm_do_action() may call sleeping functions like kmalloc(), so do not
call it with spin lock held.
Signed-off-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>
Cc: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Greg Kroah-Hartman <greg@xxxxxxxxx>
Reviewed-by: Dave Young <dyoung@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/misc/lkdtm.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff -puN drivers/misc/lkdtm.c~lkdtm-avoid-calling-lkdtm_do_action-with-spin-lock-held drivers/misc/lkdtm.c
--- a/drivers/misc/lkdtm.c~lkdtm-avoid-calling-lkdtm_do_action-with-spin-lock-held
+++ a/drivers/misc/lkdtm.c
@@ -354,6 +354,7 @@ static void lkdtm_do_action(enum ctype w
static void lkdtm_handler(void)
{
unsigned long flags;
+ bool do_it = false;
spin_lock_irqsave(&count_lock, flags);
count--;
@@ -361,10 +362,13 @@ static void lkdtm_handler(void)
cp_name_to_str(cpoint), cp_type_to_str(cptype), count);
if (count == 0) {
- lkdtm_do_action(cptype);
+ do_it = true;
count = cpoint_count;
}
spin_unlock_irqrestore(&count_lock, flags);
+
+ if (do_it)
+ lkdtm_do_action(cptype);
}
static int lkdtm_register_cpoint(enum cname which)
_
Subject: Subject: lkdtm: avoid calling lkdtm_do_action() with spinlock held
Patches currently in -mm which might be from xiyou.wangcong@xxxxxxxxx are
origin.patch
linux-next.patch
lkdtm-avoid-calling-lkdtm_do_action-with-spin-lock-held.patch
x86-mm-fix-the-size-calculation-of-mapping-tables.patch
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