On Sat,  8 Sep 2012 17:47:54 -0300
Ezequiel Garcia [off-list ref] wrote:

Previously the strndup_user allocation was being done through memdup_user,
and the caller was wrongly traced as being strndup_user
(the correct trace must report the caller of strndup_user).

This is a common problem: in order to get accurate callsite tracing,
a utils function can't allocate through another utils function,
but instead do the allocation himself (or inlined).

Here we fix this by creating an always inlined dup_user() function to
performed the real allocation and to be used by memdup_user and strndup_user.

This patch increases util.o's text size by 238 bytes.  A larger kernel
with a worsened cache footprint.

And we did this to get marginally improved tracing output?  This sounds
like a bad tradeoff to me.

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