From 25e6a11832bcd0715068f0cc24fb46ec03de676e Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Fri, 27 Jan 2017 18:27:16 +0200 Subject: [PATCH] ppc: switch to constants within BUILD_BUG_ON 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 Signed-off-by: Michael S. Tsirkin [dwg: Correct a printf format warning] Signed-off-by: David Gibson --- hw/ppc/spapr.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 9fc3fb90a1..e465d7ac98 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -2662,8 +2662,8 @@ 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 */ @@ -2672,12 +2672,14 @@ 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); - - if (index >= max_phbs) { - error_setg(errp, "\"index\" for PAPR PHB is too large (max %u)", - max_phbs - 1); + 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 >= SPAPR_MAX_PHBS) { + error_setg(errp, "\"index\" for PAPR PHB is too large (max %llu)", + SPAPR_MAX_PHBS - 1); return; } -- 2.11.4.GIT