Building arch/x86/lguest/boot.o triggers two warnings:
arch/x86/lguest/boot.c: In function 'early_put_chars':
arch/x86/lguest/boot.c:1300:5: warning: 'device_len' may be used
uninitialized in this function [-Wmaybe-uninitialized]
if (device_len < (offsetof(struct virtio_console_config, emerg_wr)
^
arch/x86/lguest/boot.c:1238:6: note: 'device_len' was declared here
u32 device_len;
^
arch/x86/lguest/boot.c:1306:21: warning: 'device_offset' may be used
uninitialized in this function [-Wmaybe-uninitialized]
console_cfg_offset = device_offset;
^
arch/x86/lguest/boot.c:1237:6: note: 'device_offset' was declared here
u32 device_offset;
^
These annoy me for some time now. So I investigated whether
probe_pci_console(), which actually triggers these warnings, could be
reorganized to make these warnings go away. (Because I really dislike to
initialize variables to some default value just to shut up the compiler.)
I came up with this short series. It makes, I think, the code clearer for the
people reading it. And as a bonus the compiler is silent now.
Paul Bolle (2):
lguest: read length of device_cap later
lguest: read offset of device_cap later
arch/x86/lguest/boot.c | 17 +++++------------
1 file changed, 5 insertions(+), 12 deletions(-)
--
2.4.3
