path: root/include/asm-generic
diff options
authorMaciej W. Rozycki <>2021-04-20 04:50:33 +0200
committerThomas Bogendoerfer <>2021-04-21 13:45:36 +0200
commitf2875832387a25efe7c3be3c5153f3a00e313906 (patch)
tree3cd5a3df45a063b8e8e437eaf2f4cfb17f1fad95 /include/asm-generic
parent5086ea4b0f58ba72c19553c4a657d7b2c0d8efc2 (diff)
div64: Correct inline documentation for `do_div'
Correct inline documentation for `do_div', which is a function-like macro the `n' parameter of which has the semantics of a C++ reference: it is both read and written in the context of the caller without an explicit dereference such as with a pointer. In the C programming language it has no equivalent for proper functions, in terms of which the documentation expresses the semantics of `do_div', but substituting a pointer in documentation is misleading, and using the C++ notation should at least raise the reader's attention and encourage to seek explanation even if the C++ semantics is not readily understood. While at it observe that "semantics" is an uncountable noun, so refer to it with a singular rather than plural verb. Signed-off-by: Maciej W. Rozycki <> Signed-off-by: Thomas Bogendoerfer <>
Diffstat (limited to 'include/asm-generic')
1 files changed, 6 insertions, 4 deletions
diff --git a/include/asm-generic/div64.h b/include/asm-generic/div64.h
index a3b98c86f077..cd905b44a630 100644
--- a/include/asm-generic/div64.h
+++ b/include/asm-generic/div64.h
@@ -8,12 +8,14 @@
* Optimization for constant divisors on 32-bit machines:
* Copyright (C) 2006-2015 Nicolas Pitre
- * The semantics of do_div() are:
+ * The semantics of do_div() is, in C++ notation, observing that the name
+ * is a function-like macro and the n parameter has the semantics of a C++
+ * reference:
- * uint32_t do_div(uint64_t *n, uint32_t base)
+ * uint32_t do_div(uint64_t &n, uint32_t base)
* {
- * uint32_t remainder = *n % base;
- * *n = *n / base;
+ * uint32_t remainder = n % base;
+ * n = n / base;
* return remainder;
* }