[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] rombios: Work around GCC issue 99578
commit e35138a2ffbe1fe71edaaaaae71063dc545a8416 Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Thu Aug 17 21:32:53 2023 +0100 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Fri Aug 18 14:25:55 2023 +0100 rombios: Work around GCC issue 99578 GCC 12 objects to pointers derived from a constant: util.c: In function 'find_rsdp': util.c:429:16: error: array subscript 0 is outside array bounds of 'uint16_t[0]' {aka 'short unsigned int[]'} [-Werror=array-bounds] 429 | ebda_seg = *(uint16_t *)ADDR_FROM_SEG_OFF(0x40, 0xe); cc1: all warnings being treated as errors This is a GCC bug, but work around it rather than turning array-bounds checking off generally. Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Acked-by: Jan Beulich <jbeulich@xxxxxxxx> --- tools/firmware/rombios/32bit/util.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/firmware/rombios/32bit/util.c b/tools/firmware/rombios/32bit/util.c index 6c1c480514..a47e000a26 100644 --- a/tools/firmware/rombios/32bit/util.c +++ b/tools/firmware/rombios/32bit/util.c @@ -424,10 +424,10 @@ static struct acpi_20_rsdp *__find_rsdp(const void *start, unsigned int len) struct acpi_20_rsdp *find_rsdp(void) { struct acpi_20_rsdp *rsdp; - uint16_t ebda_seg; + uint16_t *volatile /* GCC issue 99578 */ ebda_seg = + ADDR_FROM_SEG_OFF(0x40, 0xe); - ebda_seg = *(uint16_t *)ADDR_FROM_SEG_OFF(0x40, 0xe); - rsdp = __find_rsdp((void *)(ebda_seg << 16), 1024); + rsdp = __find_rsdp((void *)(*ebda_seg << 16), 1024); if (!rsdp) rsdp = __find_rsdp((void *)0xE0000, 0x20000); -- generated by git-patchbot for /home/xen/git/xen.git#master
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