What happens in a situation where there is no allocatable memory? Allocator would return NULL, isn't it ?
From: Manish Katiyar <mkatiyar@xxxxxxxxx>
To: Kernelnewbies <kernelnewbies@xxxxxxxxxxxx>
Sent: Sunday, March 1, 2009 2:09:13 PM
Subject: Checking of NULL with __GFP_NOFAIL in kzalloc()
Hi,
While going through jbd code, I was wondering why do we need to check
new_transaction for NULL, if we are passing __GFP_NOFAIL ?
Last code change around this code was when Ted converted kmalloc to
kzalloc, but since he also didn't remove it I am guessing there would
be some good reason for it. Can someone enlighten me ?
start_this_handle() {
..........
..........
new_transaction = kzalloc(sizeof(*new_transaction),
GFP_NOFS|__GFP_NOFAIL);
if (!new_transaction) {
ret = -ENOMEM;
goto out;
}
..........
}
Thanks -
Manish
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