RAS/CEC: Fix binary search function (f3c74b38) · Commits · 戴 / test

Switch to using Donald Knuth's binary search algorithm (The Art of Computer Programming, vol. 3, section 6.2.1). This should've been done from the very beginning but the author must've been smoking something very potent at the time. The problem with the current one was that it would return the wrong element index in certain situations: https://lkml.kernel.org/r/CAM_iQpVd02zkVJ846cj-Fg1yUNuz6tY5q1Vpj4LrXmE06dPYYg@mail.gmail.com and the noodling code after the loop was fishy at best. So switch to using Knuth's binary search. The final result is much cleaner and straightforward. Fixes: ("RAS: Add a Corrected Errors Collector") Reported-by:

Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:

Borislav Petkov <bp@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-edac <linux-edac@vger.kernel.org> Cc: <stable@vger.kernel.org>

drivers/ras/cec.c

+20 −14

Original line number	Diff line number	Diff line
		@@ -183,32 +183,38 @@ static void cec_timer_fn(struct timer_list *unused)
		*/
		static int __find_elem(struct ce_array ca, u64 pfn, unsigned int to)
		{
		int min = 0, max = ca->n - 1;
		u64 this_pfn;
		int min = 0, max = ca->n;

		while (min < max) {
		int tmp = (max + min) >> 1;
		while (min <= max) {
		int i = (min + max) >> 1;

		this_pfn = PFN(ca->array[tmp]);
		this_pfn = PFN(ca->array[i]);

		if (this_pfn < pfn)
		min = tmp + 1;
		min = i + 1;
		else if (this_pfn > pfn)
		max = tmp;
		else {
		min = tmp;
		break;
		max = i - 1;
		else if (this_pfn == pfn) {
		if (to)
		*to = i;

		return i;
		}
		}

		/*
		* When the loop terminates without finding @pfn, min has the index of
		* the element slot where the new @pfn should be inserted. The loop
		* terminates when min > max, which means the min index points to the
		* bigger element while the max index to the smaller element, in-between
		* which the new @pfn belongs to.
		*
		* For more details, see exercise 1, Section 6.2.1 in TAOCP, vol. 3.
		*/
		if (to)
		*to = min;

		this_pfn = PFN(ca->array[min]);

		if (this_pfn == pfn)
		return min;

		return -ENOKEY;
		}

Admin message