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[Qemu-devel] [PULL v4 03/23] ppc: switch to constants within BUILD_BUG_O
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v4 03/23] ppc: switch to constants within BUILD_BUG_ON |
Date: |
Tue, 31 Jan 2017 20:42:52 +0200 |
We are switching BUILD_BUG_ON to verify that it's parameter is a
compile-time constant, and it turns out that some gcc versions
(specifically gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609) are
not smart enough to figure it out for expressions involving local
variables. This is harmless but means that the check is ineffective for
these platforms. To fix, replace the variable with macros.
Reported-by: Peter Maydell <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
hw/ppc/spapr.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index a642e66..b81f2ac 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2630,8 +2630,8 @@ static void spapr_phb_placement(sPAPRMachineState *spapr,
uint32_t index,
* 1TiB 64-bit MMIO windows for each PHB.
*/
const uint64_t base_buid = 0x800000020000000ULL;
- const int max_phbs =
- (SPAPR_PCI_LIMIT - SPAPR_PCI_BASE) / SPAPR_PCI_MEM64_WIN_SIZE - 1;
+#define SPAPR_MAX_PHBS ((SPAPR_PCI_LIMIT - SPAPR_PCI_BASE) / \
+ SPAPR_PCI_MEM64_WIN_SIZE - 1)
int i;
/* Sanity check natural alignments */
@@ -2640,12 +2640,14 @@ static void spapr_phb_placement(sPAPRMachineState
*spapr, uint32_t index,
QEMU_BUILD_BUG_ON((SPAPR_PCI_MEM64_WIN_SIZE % SPAPR_PCI_MEM32_WIN_SIZE) !=
0);
QEMU_BUILD_BUG_ON((SPAPR_PCI_MEM32_WIN_SIZE % SPAPR_PCI_IO_WIN_SIZE) != 0);
/* Sanity check bounds */
- QEMU_BUILD_BUG_ON((max_phbs * SPAPR_PCI_IO_WIN_SIZE) >
SPAPR_PCI_MEM32_WIN_SIZE);
- QEMU_BUILD_BUG_ON((max_phbs * SPAPR_PCI_MEM32_WIN_SIZE) >
SPAPR_PCI_MEM64_WIN_SIZE);
+ QEMU_BUILD_BUG_ON((SPAPR_MAX_PHBS * SPAPR_PCI_IO_WIN_SIZE) >
+ SPAPR_PCI_MEM32_WIN_SIZE);
+ QEMU_BUILD_BUG_ON((SPAPR_MAX_PHBS * SPAPR_PCI_MEM32_WIN_SIZE) >
+ SPAPR_PCI_MEM64_WIN_SIZE);
- if (index >= max_phbs) {
+ if (index >= SPAPR_MAX_PHBS) {
error_setg(errp, "\"index\" for PAPR PHB is too large (max %u)",
- max_phbs - 1);
+ SPAPR_MAX_PHBS - 1);
return;
}
--
MST
- [Qemu-devel] [PULL v4 00/23] virtio, vhost, pci: fixes, features, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 01/23] compiler: drop ; after BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 02/23] qxl: switch to constants within BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 03/23] ppc: switch to constants within BUILD_BUG_ON,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v4 05/23] compiler: rework BUG_ON using a struct, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 04/23] QEMU_BUILD_BUG_ON: use __COUNTER__, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 06/23] QEMU_BUILD_BUG_ON: use __COUNTER__, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 08/23] ARRAY_SIZE: check that argument is an array, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 07/23] compiler: expression version of QEMU_BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 09/23] pci: mark ROMs read-only, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 10/23] intel_iommu: fix and simplify size calculation in process_device_iotlb_desc(), Michael S. Tsirkin, 2017/01/31