target/linux/bcm27xx/patches-5.4/950-0460-PCI-brcmstb-Fix-build-on-32bit-ARM-platforms-with-ol.patch

   1 From 39192141aa16809323c24d8910e3a63488f7f55d Mon Sep 17 00:00:00 2001
   2 From: Marek Szyprowski <m.szyprowski@samsung.com>
   3 Date: Thu, 27 Feb 2020 12:51:46 +0100
   4 Subject: [PATCH] PCI: brcmstb: Fix build on 32bit ARM platforms with
   5  older compilers
   6
   7 commit 73a7a271b3eee7b83f29b13866163776f1cbef89 upstream.
   8
   9 Some older compilers have no implementation for the helper for 64-bit
  10 unsigned division/modulo, so linking pcie-brcmstb driver causes the
  11 "undefined reference to `__aeabi_uldivmod'" error.
  12
  13 *rc_bar2_size is always a power of two, because it is calculated as:
  14 "1ULL << fls64(entry->res->end - entry->res->start)", so the modulo
  15 operation in the subsequent check can be replaced by a simple logical
  16 AND with a proper mask.
  17
  18 Link: https://lore.kernel.org/r/20200227115146.24515-1-m.szyprowski@samsung.com
  19 Fixes: c0452137034b ("PCI: brcmstb: Add Broadcom STB PCIe host controller driver")
  20 Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
  21 Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
  22 Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  23 Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
  24 ---
  25  drivers/pci/controller/pcie-brcmstb.c | 2 +-
  26  1 file changed, 1 insertion(+), 1 deletion(-)
  27
  28 --- a/drivers/pci/controller/pcie-brcmstb.c
  29 +++ b/drivers/pci/controller/pcie-brcmstb.c
  30 @@ -670,7 +670,7 @@ static inline int brcm_pcie_get_rc_bar2_
  31          *   outbound memory @ 3GB). So instead it will  start at the 1x
  32          *   multiple of its size
  33          */
  34 -       if (!*rc_bar2_size || *rc_bar2_offset % *rc_bar2_size ||
  35 +       if (!*rc_bar2_size || (*rc_bar2_offset & (*rc_bar2_size - 1)) ||
  36             (*rc_bar2_offset < SZ_4G && *rc_bar2_offset > SZ_2G)) {
  37                 dev_err(dev, "Invalid rc_bar2_offset/size: size 0x%llx, off 0x%llx\n",
  38                         *rc_bar2_size, *rc_bar2_offset);