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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/scripts/coccinelle/api/alloc/zalloc-simple.cocci
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 ///
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 /// Use zeroing allocator rather than allocator followed by memset with 0
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 ///
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@@ -6,9 +7,9 @@
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 /// matched code has to be contiguous
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 ///
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 // Confidence: High
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-// Copyright: (C) 2009-2010 Julia Lawall, Nicolas Palix, DIKU.  GPLv2.
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-// Copyright: (C) 2009-2010 Gilles Muller, INRIA/LiP6.  GPLv2.
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-// Copyright: (C) 2017 Himanshu Jha GPLv2.
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+// Copyright: (C) 2009-2010 Julia Lawall, Nicolas Palix, DIKU.
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+// Copyright: (C) 2009-2010 Gilles Muller, INRIA/LiP6.
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+// Copyright: (C) 2017 Himanshu Jha
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 // URL: http://coccinelle.lip6.fr/rules/kzalloc.html
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 // Options: --no-includes --include-headers
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 //
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@@ -69,15 +70,6 @@
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 - x = (T)vmalloc(E1);
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 + x = (T)vzalloc(E1);
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 |
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-- x = dma_alloc_coherent(E2,E1,E3,E4);
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-+ x = dma_zalloc_coherent(E2,E1,E3,E4);
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-|
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-- x = (T *)dma_alloc_coherent(E2,E1,E3,E4);
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-+ x = dma_zalloc_coherent(E2,E1,E3,E4);
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-|
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-- x = (T)dma_alloc_coherent(E2,E1,E3,E4);
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-+ x = (T)dma_zalloc_coherent(E2,E1,E3,E4);
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-|
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 - x = kmalloc_node(E1,E2,E3);
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 + x = kzalloc_node(E1,E2,E3);
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 |
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@@ -134,6 +126,16 @@
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 )
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   if ((x==NULL) || ...) S
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 - memset((T2)x,0,E1);
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+
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+@depends on patch@
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+type T, T2;
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+expression x;
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+expression E1,E2,E3,E4;
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+statement S;
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+@@
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+  x = (T)dma_alloc_coherent(E1, E2, E3, E4);
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+  if ((x==NULL) || ...) S
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+- memset((T2)x, 0, E2);
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 //----------------------------------------------------------
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 //  For org mode
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@@ -207,9 +209,9 @@
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 position p;
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 @@
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- x = (T)dma_alloc_coherent@p(E2,E1,E3,E4);
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+ x = (T)dma_alloc_coherent@p(E1,E2,E3,E4);
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  if ((x==NULL) || ...) S
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- memset((T2)x,0,E1);
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+ memset((T2)x,0,E2);
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 @script:python depends on org@
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 p << r2.p;
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@@ -225,7 +227,7 @@
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 x << r2.x;
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 @@
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-msg="WARNING: dma_zalloc_coherent should be used for %s, instead of dma_alloc_coherent/memset" % (x)
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+msg="WARNING: dma_alloc_coherent used in %s already zeroes out memory, so memset is not needed" % (x)
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 coccilib.report.print_report(p[0], msg)
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 //-----------------------------------------------------------------