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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 04:56:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 04:56:27 +0300
commitdf34df483a97b1591a3e90a6941f99fe9f863508 (patch)
tree1b7239fba7513ecbc3a3b322125fc8c3761bd65e /lib
parent9abf8acea297b4c65f5fa3206e2b8e468e730e84 (diff)
parent049b5e2ae30b3c2f870cc9550af6f9a947fbd5b5 (diff)
downloadlinux-df34df483a97b1591a3e90a6941f99fe9f863508.tar.xz
Merge tag 'staging-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging/IIO updates from Greg KH: "Here is the big set of Staging/IIO driver patches for 4.17-rc1. It is a lot, over 500 changes, but not huge by previous kernel release standards. We deleted more lines than we added again (27k added vs. 91k remvoed), thanks to finally being able to delete the IRDA drivers and networking code. We also deleted the ccree crypto driver, but that's coming back in through the crypto tree to you, in a much cleaned-up form. Added this round is at lot of "mt7621" device support, which is for an embedded device that Neil Brown cares about, and of course a handful of new IIO drivers as well. And finally, the fsl-mc core code moved out of the staging tree to the "real" part of the kernel, which is nice to see happen as well. Full details are in the shortlog, which has all of the tiny cleanup patches described. All of these have been in linux-next for a while with no reported issues" * tag 'staging-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (579 commits) staging: rtl8723bs: Remove yield call, replace with cond_resched() staging: rtl8723bs: Replace yield() call with cond_resched() staging: rtl8723bs: Remove unecessary newlines from 'odm.h'. staging: rtl8723bs: Rework 'struct _ODM_Phy_Status_Info_' coding style. staging: rtl8723bs: Rework 'struct _ODM_Per_Pkt_Info_' coding style. staging: rtl8723bs: Replace NULL pointer comparison with '!'. staging: rtl8723bs: Factor out rtl8723bs_recv_tasklet() sections. staging: rtl8723bs: Fix function signature that goes over 80 characters. staging: rtl8723bs: Fix lines too long in update_recvframe_attrib(). staging: rtl8723bs: Remove unnecessary blank lines in 'rtl8723bs_recv.c'. staging: rtl8723bs: Change camel case to snake case in 'rtl8723bs_recv.c'. staging: rtl8723bs: Add missing braces in else statement. staging: rtl8723bs: Add spaces around ternary operators. staging: rtl8723bs: Fix lines with trailing open parentheses. staging: rtl8723bs: Remove unnecessary length #define's. staging: rtl8723bs: Fix IEEE80211 authentication algorithm constants. staging: rtl8723bs: Fix alignment in rtw_wx_set_auth(). staging: rtl8723bs: Remove braces from single statement conditionals. staging: rtl8723bs: Remove unecessary braces from switch statement. staging: rtl8723bs: Fix newlines in rtw_wx_set_auth(). ...
Diffstat (limited to 'lib')
-rw-r--r--lib/int_sqrt.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/int_sqrt.c b/lib/int_sqrt.c
index e2d329099bf7..14436f4ca6bd 100644
--- a/lib/int_sqrt.c
+++ b/lib/int_sqrt.c
@@ -38,3 +38,33 @@ unsigned long int_sqrt(unsigned long x)
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) & ~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