[PATCH] Coccinelle: Script to use roundup and DIV_ROUND_UP

[Amitoj Kaur Chawla]

This script replaces manual calculations by using the predefined
macros in kernel.h, DIV_ROUND_UP and roundup for readability purposes.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@xxxxxxxxx>
---
 scripts/coccinelle/api/roundup.cocci | 215 +++++++++++++++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 scripts/coccinelle/api/roundup.cocci

diff --git a/scripts/coccinelle/api/roundup.cocci b/scripts/coccinelle/api/roundup.cocci
new file mode 100644
index 0000000..af97cd2
--- /dev/null
+++ b/scripts/coccinelle/api/roundup.cocci
@@ -0,0 +1,215 @@
+/// Use DIV_ROUND_UP and roundup to improve readability
+///
+// Confidence: High
+// Copyright: (C) 2016 Amitoj Kaur Chawla
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@haskernel@
+@@
+
+#include <linux/kernel.h>
+
+@round1 depends on haskernel && patch && !context && !org && !report@
+expression x, y;
+@@
+
+(
+- (((x + (y - 1)) / y) * y)
++ roundup(x, y)
+|
+- (((x + y - 1) / y) * y)
++ roundup(x, y)
+)
+
+@round2 depends on haskernel && patch && !context && !org && !report
+ disable paren@
+expression x, y;
+@@
+
+- roundup((x), y)
++ roundup(x, y)
+
+@round3 depends on haskernel && patch && !context && !org && !report
+ disable paren@
+expression x, y;
+@@
+
+- roundup(x, (y))
++ roundup(x, y)
+
+@round4 depends on haskernel && patch && !context && !org && !report@
+expression n,d;
+@@
+
+(
+- ((n + d - 1) / d)
++ DIV_ROUND_UP(n,d)
+|
+- ((n + (d - 1)) / d)
++ DIV_ROUND_UP(n,d)
+)
+
+@round5 depends on haskernel && patch && !context && !org && !report
+ disable paren@
+expression n,d;
+@@
+
+- DIV_ROUND_UP((n),d)
++ DIV_ROUND_UP(n,d)
+
+@round6 depends on haskernel && patch && !context && !org && !report
+ disable paren@
+expression n,d;
+@@
+
+- DIV_ROUND_UP(n,(d))
++ DIV_ROUND_UP(n,d)
+
+// ----------------------------------------------------------------------------
+
+@round1_context depends on haskernel && !patch && (context || org || report)@
+expression e, x, y;
+position j,j0;
+@@
+
+(
+*  (((x@j + (y - 1)) / y) *@e@j0 y)
+|
+*  (((x@j + y - 1) / y) *@e@j0 y)
+)
+
+@round2_context depends on haskernel && !patch && (context || org || report)
+ disable paren@
+expression x, y;
+position j0;
+@@
+
+*  roundup@j0((x), y)
+
+@round3_context depends on haskernel && !patch && (context || org || report)
+ disable paren@
+expression x, y;
+position j0;
+@@
+
+*  roundup@j0(x, (y))
+
+@round4_context depends on haskernel && !patch && (context || org || report)@
+expression e, d, n;
+position j!=round1_context.j;
+position j0;
+@@
+
+(
+*  ((n@j + d - 1) /@e@j0 d)
+|
+*  ((n@j + (d - 1)) /@e@j0 d)
+)
+
+@round5_context depends on haskernel && !patch && (context || org || report)
+ disable paren@
+expression d, n;
+position j0;
+@@
+
+*  DIV_ROUND_UP@j0((n),d)
+
+@round6_context depends on haskernel && !patch && (context || org || report)
+ disable paren@
+expression d, n;
+position j0;
+@@
+
+*  DIV_ROUND_UP@j0(n,(d))
+
+// ----------------------------------------------------------------------------
+
+@script:python round1_org depends on org@
+j0 << round1_context.j0;
+@@
+
+msg = "WARNING: Replace with roundup."
+coccilib.org.print_todo(j0[0], msg)
+
+@script:python round2_org depends on org@
+j0 << round2_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the first argument of roundup."
+coccilib.org.print_todo(j0[0], msg)
+
+@script:python round3_org depends on org@
+j0 << round3_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the second argument of roundup."
+coccilib.org.print_todo(j0[0], msg)
+
+@script:python round4_org depends on org@
+j0 << round4_context.j0;
+@@
+
+msg = "WARNING: Replace with DIV_ROUND_UP."
+coccilib.org.print_todo(j0[0], msg)
+
+@script:python round5_org depends on org@
+j0 << round5_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the first argument of DIV_ROUND_UP."
+coccilib.org.print_todo(j0[0], msg)
+
+@script:python round6_org depends on org@
+j0 << round6_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the second argument of DIV_ROUND_UP."
+coccilib.org.print_todo(j0[0], msg)
+
+// ----------------------------------------------------------------------------
+
+@script:python round1_report depends on report@
+j0 << round1_context.j0;
+@@
+
+msg = "WARNING: Replace with roundup."
+coccilib.report.print_report(j0[0], msg)
+
+@script:python round2_report depends on report@
+j0 << round2_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the first argument of roundup."
+coccilib.report.print_report(j0[0], msg)
+
+@script:python round3_report depends on report@
+j0 << round3_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the second argument of roundup."
+coccilib.report.print_report(j0[0], msg)
+
+@script:python round4_report depends on report@
+j0 << round4_context.j0;
+@@
+
+msg = "WARNING: Replace with DIV_ROUND_UP."
+coccilib.report.print_report(j0[0], msg)
+
+@script:python round5_report depends on report@
+j0 << round5_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the first argument of DIV_ROUND_UP."
+coccilib.report.print_report(j0[0], msg)
+
+@script:python round6_report depends on report@
+j0 << round6_context.j0;
+@@
+
+msg = "WARNING: Unneeded parentheses in the second argument of DIV_ROUND_UP."
+coccilib.report.print_report(j0[0], msg)
-- 
1.9.1