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authorLinus Walleij <linus.walleij@linaro.org>2022-06-30 10:41:24 +0200
committerakpm <akpm@linux-foundation.org>2022-07-17 17:14:37 -0700
commit9330723c26ca22c95065d2e41741cfeef00e4fd7 (patch)
tree2ffdc54b8077587dd7fe1c746806b1d07b199f86 /mm/nommu.c
parent396a400bc1d3c3e8e4ab836f834d2da7c070d395 (diff)
mm: nommu: pass a pointer to virt_to_page()
Functions that work on a pointer to virtual memory such as virt_to_pfn() and users of that function such as virt_to_page() are supposed to pass a pointer to virtual memory, ideally a (void *) or other pointer. However since many architectures implement virt_to_pfn() as a macro, this function becomes polymorphic and accepts both a (unsigned long) and a (void *). If we instead implement a proper virt_to_pfn(void *addr) function the following happens (occurred on arch/arm): mm/nommu.c: In function 'free_page_series': mm/nommu.c:501:50: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion] struct page *page = virt_to_page(from); Fix this with an explicit cast. Link: https://lkml.kernel.org/r/20220630084124.691207-6-linus.walleij@linaro.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 9d7afc2d959e..e819cbc21b39 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -500,7 +500,7 @@ static void delete_nommu_region(struct vm_region *region)
static void free_page_series(unsigned long from, unsigned long to)
{
for (; from < to; from += PAGE_SIZE) {
- struct page *page = virt_to_page(from);
+ struct page *page = virt_to_page((void *)from);
atomic_long_dec(&mmap_pages_allocated);
put_page(page);