Revision 2dbb0e6c1961d823354c12bc1b66b005d1c78092 authored by Linus Torvalds on 15 March 2019, 21:05:00 UTC, committed by Linus Torvalds on 15 March 2019, 21:05:00 UTC
Pull sound fixes from Takashi Iwai: "Some cleaning after the first batch; mostly about HD-audio quirks but also some NULL dereference fixes in corner cases and a random build error fix, too" * tag 'sound-fix-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: hda/realtek - Add support headset mode for New DELL WYSE NB ALSA: hda/realtek - Add support headset mode for DELL WYSE AIO ALSA: hda/realtek: merge alc_fixup_headset_jack to alc295_fixup_chromebook ALSA: pcm: Fix function name in kernel-doc comment ALSA: hda: hdmi - add Icelake support ALSA: hda - add more quirks for HP Z2 G4 and HP Z240 ALSA: hda/realtek - Fixed Headset Mic JD not stable ALSA: hda/realtek: Enable headset MIC of Acer TravelMate X514-51T with ALC255 ALSA: hda/tegra: avoid build error without CONFIG_PM ALSA: usx2y: Fix potential NULL pointer dereference ALSA: hda: Avoid NULL pointer dereference at snd_hdac_stream_start()
int_sqrt.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013 Davidlohr Bueso <davidlohr.bueso@hp.com>
*
* Based on the shift-and-subtract algorithm for computing integer
* square root from Guy L. Steele.
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/bitops.h>
/**
* int_sqrt - computes the integer square root
* @x: integer of which to calculate the sqrt
*
* Computes: floor(sqrt(x))
*/
unsigned long int_sqrt(unsigned long x)
{
unsigned long b, m, y = 0;
if (x <= 1)
return x;
m = 1UL << (__fls(x) & ~1UL);
while (m != 0) {
b = y + m;
y >>= 1;
if (x >= b) {
x -= b;
y += m;
}
m >>= 2;
}
return y;
}
EXPORT_SYMBOL(int_sqrt);
#if BITS_PER_LONG < 64
/**
* int_sqrt64 - strongly typed int_sqrt function when minimum 64 bit input
* is expected.
* @x: 64bit integer of which to calculate the sqrt
*/
u32 int_sqrt64(u64 x)
{
u64 b, m, y = 0;
if (x <= ULONG_MAX)
return int_sqrt((unsigned long) x);
m = 1ULL << ((fls64(x) - 1) & ~1ULL);
while (m != 0) {
b = y + m;
y >>= 1;
if (x >= b) {
x -= b;
y += m;
}
m >>= 2;
}
return y;
}
EXPORT_SYMBOL(int_sqrt64);
#endif
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