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lib/int_sqrt: adjust comments

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Our current int_sqrt() is not rough nor any approximation; it calculates
the exact value of: floor(sqrt()).  Document this.

Link: http://lkml.kernel.org/r/20171020164645.001652117@infradead.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Anshul Garg <aksgarg1989@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Joe Perches <joe@perches.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Michael Davidson <md@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra 2017-11-17 15:28:12 -08:00 committed by Linus Torvalds
parent f8ae107eef
commit e813a61400
1 changed files with 2 additions and 2 deletions
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4
lib/int_sqrt.c
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@ -11,10 +11,10 @@
#include <linux/bitops.h> #include <linux/bitops.h>
/** /**
* int_sqrt - rough approximation to sqrt * int_sqrt - computes the integer square root
* @x: integer of which to calculate the sqrt * @x: integer of which to calculate the sqrt
* *
* A very rough approximation to the sqrt() function. * Computes: floor(sqrt(x))
*/ */
unsigned long int_sqrt(unsigned long x) unsigned long int_sqrt(unsigned long x)
{ {