Hi Matt, On 1/18/24 01:38, Matt Coster wrote: > On 10/01/2024 00:23, Randy Dunlap wrote: >> Fix a build error when using GCC 13.2.0 from kernel.org crosstools >> by changing ARRAY_SIZE() to the macro PVR_MIPS_PT_PAGE_COUNT: > > I assume you're referring to the x86_64 => aarch64 toolchain here?
Yes. > >> drivers/gpu/drm/imagination/pvr_vm_mips.c: In function 'pvr_vm_mips_fini': >> ../include/linux/array_size.h:11:25: warning: overflow in conversion from >> 'long unsigned int' to 'int' changes value from '18446744073709551615' to >> '-1' [-Woverflow] >> 11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + >> __must_be_array(arr)) >> | ^ >> drivers/gpu/drm/imagination/pvr_vm_mips.c:105:24: note: in expansion of >> macro 'ARRAY_SIZE' >> 105 | for (page_nr = ARRAY_SIZE(mips_data->pt_pages) - 1; page_nr >> >= 0; page_nr--) { >> | ^~~~~~~~~~ > > I can't seem to reproduce this using the above toolchain (or any other), > even with -Woverflow explicitly specified. > > The use of ARRAY_SIZE() in loop bounds is a pretty common construction – > even within the pvr driver. Do you see similar warnings anywhere else? No, this is the only place that I have seen this issue. Thanks. > -- > Matt Coster > Imagination Technologies > >> Fixes: 927f3e0253c1 ("drm/imagination: Implement MIPS firmware processor and >> MMU support") >> Signed-off-by: Randy Dunlap <rdun...@infradead.org> >> Cc: Donald Robson <donald.rob...@imgtec.com> >> Cc: Maxime Ripard <mrip...@kernel.org> >> Cc: Frank Binns <frank.bi...@imgtec.com> >> Cc: Matt Coster <matt.cos...@imgtec.com> >> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com> >> Cc: Thomas Zimmermann <tzimmerm...@suse.de> >> Cc: David Airlie <airl...@gmail.com> >> Cc: Daniel Vetter <dan...@ffwll.ch> >> Cc: dri-devel@lists.freedesktop.org >> --- >> drivers/gpu/drm/imagination/pvr_vm_mips.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff -- a/drivers/gpu/drm/imagination/pvr_vm_mips.c >> b/drivers/gpu/drm/imagination/pvr_vm_mips.c >> --- a/drivers/gpu/drm/imagination/pvr_vm_mips.c >> +++ b/drivers/gpu/drm/imagination/pvr_vm_mips.c >> @@ -46,7 +46,7 @@ pvr_vm_mips_init(struct pvr_device *pvr_ >> if (!mips_data) >> return -ENOMEM; >> - for (page_nr = 0; page_nr < ARRAY_SIZE(mips_data->pt_pages); >> page_nr++) { >> + for (page_nr = 0; page_nr < PVR_MIPS_PT_PAGE_COUNT; page_nr++) { >> mips_data->pt_pages[page_nr] = alloc_page(GFP_KERNEL | __GFP_ZERO); >> if (!mips_data->pt_pages[page_nr]) { >> err = -ENOMEM; >> @@ -102,7 +102,7 @@ pvr_vm_mips_fini(struct pvr_device *pvr_ >> int page_nr; >> vunmap(mips_data->pt); >> - for (page_nr = ARRAY_SIZE(mips_data->pt_pages) - 1; page_nr >= 0; >> page_nr--) { >> + for (page_nr = PVR_MIPS_PT_PAGE_COUNT - 1; page_nr >= 0; page_nr--) { >> dma_unmap_page(from_pvr_device(pvr_dev)->dev, >> mips_data->pt_dma_addr[page_nr], PAGE_SIZE, >> DMA_TO_DEVICE); >> -- #Randy