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drm/imagination: avoid -Woverflow warning

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The array size calculation in pvr_vm_mips_fini() appears to be incorrect based on
taking the size of the pointer rather than the size of the array, which manifests
as a warning about signed integer overflow:

In file included from include/linux/kernel.h:16,
                 from drivers/gpu/drm/imagination/pvr_rogue_fwif.h:10,
                 from drivers/gpu/drm/imagination/pvr_ccb.h:7,
                 from drivers/gpu/drm/imagination/pvr_device.h:7,
                 from drivers/gpu/drm/imagination/pvr_vm_mips.c:4:
drivers/gpu/drm/imagination/pvr_vm_mips.c: In function 'pvr_vm_mips_fini':
include/linux/array_size.h:11:25: error: overflow in conversion from 'long unsigned int' to 'int' changes value from '18446744073709551615' to '-1' [-Werror=overflow]
   11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
      |                         ^
drivers/gpu/drm/imagination/pvr_vm_mips.c:106:24: note: in expansion of macro 'ARRAY_SIZE'
  106 |         for (page_nr = ARRAY_SIZE(mips_data->pt_pages) - 1; page_nr >= 0; page_nr--) {
      |                        ^~~~~~~~~~

Just use the number of array elements directly here, and in the corresponding
init function for consistency.

Fixes: 927f3e0253c1 ("drm/imagination: Implement MIPS firmware processor and MMU support")
Reviewed-by: Donald Robson <donald.robson@imgtec.com>
Link: https://lore.kernel.org/lkml/9df9e4f87727399928c068dbbf614c9895ae15f9.camel@imgtec.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
This commit is contained in:
Arnd Bergmann 2024-03-22 14:01:09 +01:00 committed by Matt Coster
parent 0b45921c2a
commit 07b9d0144f
No known key found for this signature in database
GPG Key ID: 79BC19F3D9DE6AB0
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/imagination/pvr_vm_mips.c
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@ -46,7 +46,7 @@ pvr_vm_mips_init(struct pvr_device *pvr_dev)
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_dev)
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);