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Re: [Xen-devel] [PATCH v3 5/5] xen: modify several static locks to unique names

On 03.09.19 17:09, Jan Beulich wrote:
On 03.09.2019 17:03, Juergen Gross wrote:
On 03.09.19 16:53, Jan Beulich wrote:
On 29.08.2019 12:18, Juergen Gross wrote:
In order to have unique names when doing lock profiling several local
locks "lock" need to be renamed.

But these are all named simply "lock" for a good reason, including
because they're all function scope symbols (and typically the
functions are all sufficiently short). The issue stems from the
dual use of "name" in

#define _LOCK_PROFILE(name) { 0, #name, &name, 0, 0, 0, 0, 0 }

so I'd rather suggest making this a derivation of a new

#define _LOCK_PROFILE_NAME(lock, name) { 0, #name, &lock, 0, 0, 0, 0, 0 }

if there's no other (transparent) way of disambiguating the names.

This will require to use a different DEFINE_SPINLOCK() variant, so e.g.
DEFINE_SPINLOCK_LOCAL(), which will then include the needed "static" and
add "@<func>" to the lock profiling name. Is this okay?

To be frank - not really. I dislike both, and would hence prefer to
stick to what there is currently, until someone invents a transparent
way to disambiguate these. I'm sorry for being unhelpful here.

NP with me. It was Andrew who asked for a way to differentiate between
multiple locks. I'm not depending in any way on this patch.


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