Re: [PATCH libdrm] xf86drm.c: Use integer logarithm.

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On 2020-10-28 11:09 a.m., Paul Gofman wrote:
On 10/28/20 11:18, Pekka Paalanen wrote:

+static unsigned log2_int(unsigned x)
+{
+    unsigned l;
+
+    if (x < 2) {
+        return 0;
+    }
+    for (l = 2; ; l++) {
+        if ((unsigned)(1 << l) > x) {
Hi,

wouldn't this loop fail to end when x >= 0x80000000?

Sure, such value probably cannot occur where this is currently used,
but it seems like a landmine for the next developer to step on.

Indeed, thanks. I've sent the patches for consideration which avoid
function duplication and potentially infinite loop.

libdrm uses GitLab merge requests now: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests


--
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer
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