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deprecated.rst: Remove now removed uninitialized_var

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It's now gone from the kernel so remove it from the deprecated API text.

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/5e10c1645dd8f735215cf54a74db0f8dd3f6cbd5.camel@perches.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Joe Perches 2020-08-26 20:12:01 -07:00 committed by Jonathan Corbet
parent 3519c4d6e0
commit 3942ea7a10
1 changed files with 0 additions and 18 deletions
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Documentation/process/deprecated.rst
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@ -51,24 +51,6 @@ to make sure their systems do not continue running in the face of
"unreachable" conditions. (For example, see commits like `this one
<https://git.kernel.org/linus/d4689846881d160a4d12a514e991a740bcb5d65a>`_.)
uninitialized_var()
-------------------
For any compiler warnings about uninitialized variables, just add
an initializer. Using the uninitialized_var() macro (or similar
warning-silencing tricks) is dangerous as it papers over `real bugs
<https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/>`_
(or can in the future), and suppresses unrelated compiler warnings
(e.g. "unused variable"). If the compiler thinks it is uninitialized,
either simply initialize the variable or make compiler changes. Keep in
mind that in most cases, if an initialization is obviously redundant,
the compiler's dead-store elimination pass will make sure there are no
needless variable writes.
As Linus has said, this macro
`must <https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/>`_
`be <https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/>`_
`removed <https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/>`_.
open-coded arithmetic in allocator arguments
--------------------------------------------
Dynamic size calculations (especially multiplication) should not be