From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
To: Sasha Levin <sashal@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Shuah Khan <shuah@kernel.org>,
Peter Xu <peterx@redhat.com>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] selftests/mm: fix pointer width warnings on 32-bit architectures
Date: Tue, 3 Nov 2026 17:13:07 +0000 [thread overview]
Message-ID: <auoV594YOaoeo0Vz@gremlin> (raw)
In-Reply-To: <20261103163907.640667-1-sashal@kernel.org>
On Tue, Nov 03, 2026 at 11:39:07AM -0500, Sasha Levin wrote:
> Several mm tests convert between pointers and 64-bit integers with a
> plain cast, which warns on 32-bit architectures, and hugetlb-mremap
> passes 47-bit mmap() hints that don't fit in an unsigned long:
>
> uffd-unit-tests.c:344:31: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>
> Cast through uintptr_t where pointers meet the 64-bit UAPI fields and
> the 64-bit address arithmetic in mremap_test, and include stdint.h there
> for it. The hugetlb-mremap hints don't fit in a 32-bit address space, so
> only pass them when long is 64 bits.
>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
I see you add:
static void *addr_hint(unsigned long long addr)
{
return sizeof(long) == 8 ? (void *)(uintptr_t)addr : NULL;
}
for the void * stuff, but then open-code the uint64_t parts.
Could you do something similar there please?
Thanks!
> ---
> Found with 32-bit builds of the selftests (gcc 16 and clang 21 with
> -m32, with and without -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64);
> KernelCI's 32-bit arm builds show the same warnings. The changed files
> build without them now, and the x86_64 builds don't change.
>
> tools/testing/selftests/mm/hmm-tests.c | 4 +-
> tools/testing/selftests/mm/hugetlb-mremap.c | 17 ++++---
> tools/testing/selftests/mm/migration.c | 4 +-
> tools/testing/selftests/mm/mremap_test.c | 13 +++---
> tools/testing/selftests/mm/uffd-common.c | 2 +-
> tools/testing/selftests/mm/uffd-unit-tests.c | 48 ++++++++++----------
> 6 files changed, 47 insertions(+), 41 deletions(-)
>
> diff --git a/tools/testing/selftests/mm/hmm-tests.c b/tools/testing/selftests/mm/hmm-tests.c
> index e5f273ca84c10..2a8806a131a5b 100644
> --- a/tools/testing/selftests/mm/hmm-tests.c
> +++ b/tools/testing/selftests/mm/hmm-tests.c
> @@ -196,8 +196,8 @@ static int hmm_dmirror_cmd(int fd,
> int ret;
>
> /* Simulate a device reading system memory. */
> - cmd.addr = (__u64)buffer->ptr;
> - cmd.ptr = (__u64)buffer->mirror;
> + cmd.addr = (__u64)(uintptr_t)buffer->ptr;
> + cmd.ptr = (__u64)(uintptr_t)buffer->mirror;
> cmd.npages = npages;
>
> for (;;) {
> diff --git a/tools/testing/selftests/mm/hugetlb-mremap.c b/tools/testing/selftests/mm/hugetlb-mremap.c
> index 9b724af66e938..531f270fabfb5 100644
> --- a/tools/testing/selftests/mm/hugetlb-mremap.c
> +++ b/tools/testing/selftests/mm/hugetlb-mremap.c
> @@ -33,6 +33,11 @@
> #define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC)
> #define FLAGS (MAP_HUGETLB | MAP_SHARED)
>
> +static void *addr_hint(unsigned long long addr)
> +{
> + return sizeof(long) == 8 ? (void *)(uintptr_t)addr : NULL;
> +}
> +
> static void check_bytes(char *addr)
> {
> ksft_print_msg("First hex is %x\n", *((unsigned int *)addr));
> @@ -130,21 +135,21 @@ int main(int argc, char *argv[])
> ksft_exit_fail_msg("Open failed: %s\n", strerror(errno));
>
> /* mmap to a PUD aligned address to hopefully trigger pmd sharing. */
> - unsigned long suggested_addr = 0x7eaa40000000;
> - void *haddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);
> + void *haddr = mmap(addr_hint(0x7eaa40000000ULL), length, PROTECTION, FLAGS,
> + fd, 0);
> ksft_print_msg("Map haddr: Returned address is %p\n", haddr);
> if (haddr == MAP_FAILED)
> ksft_exit_fail_msg("mmap1: %s\n", strerror(errno));
>
> /* mmap again to a dummy address to hopefully trigger pmd sharing. */
> - suggested_addr = 0x7daa40000000;
> - void *daddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);
> + void *daddr = mmap(addr_hint(0x7daa40000000ULL), length, PROTECTION, FLAGS,
> + fd, 0);
> ksft_print_msg("Map daddr: Returned address is %p\n", daddr);
> if (daddr == MAP_FAILED)
> ksft_exit_fail_msg("mmap3: %s\n", strerror(errno));
>
> - suggested_addr = 0x7faa40000000;
> - void *vaddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);
> + void *vaddr = mmap(addr_hint(0x7faa40000000ULL), length, PROTECTION, FLAGS,
> + fd, 0);
> ksft_print_msg("Map vaddr: Returned address is %p\n", vaddr);
> if (vaddr == MAP_FAILED)
> ksft_exit_fail_msg("mmap2: %s\n", strerror(errno));
> diff --git a/tools/testing/selftests/mm/migration.c b/tools/testing/selftests/mm/migration.c
> index d1d0989ed2cad..1c5208ce048ee 100644
> --- a/tools/testing/selftests/mm/migration.c
> +++ b/tools/testing/selftests/mm/migration.c
> @@ -236,7 +236,7 @@ TEST_F_TIMEOUT(migration, private_anon_thp, 2*RUNTIME)
> MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
> ASSERT_NE(ptr, MAP_FAILED);
>
> - ptr = (uint64_t *) ALIGN((uintptr_t) ptr, pmdsize);
> + ptr = (uint64_t *)(uintptr_t)ALIGN((uintptr_t) ptr, pmdsize);
> ASSERT_EQ(madvise(ptr, pmdsize, MADV_HUGEPAGE), 0);
> memset(ptr, 0xde, pmdsize);
> for (i = 0; i < self->nthreads; i++)
> @@ -270,7 +270,7 @@ TEST_F_TIMEOUT(migration, shared_anon_thp, 2*RUNTIME)
> MAP_SHARED | MAP_ANONYMOUS, -1, 0);
> ASSERT_NE(ptr, MAP_FAILED);
>
> - ptr = (uint64_t *) ALIGN((uintptr_t) ptr, pmdsize);
> + ptr = (uint64_t *)(uintptr_t)ALIGN((uintptr_t) ptr, pmdsize);
> ASSERT_EQ(madvise(ptr, pmdsize, MADV_HUGEPAGE), 0);
>
> memset(ptr, 0xde, pmdsize);
> diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
> index 31b484517bda6..7e7ca67f7e94c 100644
> --- a/tools/testing/selftests/mm/mremap_test.c
> +++ b/tools/testing/selftests/mm/mremap_test.c
> @@ -15,6 +15,7 @@
> #include <syscall.h>
> #include <time.h>
> #include <stdbool.h>
> +#include <stdint.h>
>
> #include "kselftest.h"
>
> @@ -190,7 +191,7 @@ static void *get_source_mapping(struct config c)
> if (addr < mmap_min_addr)
> goto retry;
>
> - src_addr = mmap((void *) addr, c.region_size, PROT_READ | PROT_WRITE,
> + src_addr = mmap((void *)(uintptr_t)addr, c.region_size, PROT_READ | PROT_WRITE,
> MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED,
> -1, 0);
> if (src_addr == MAP_FAILED) {
> @@ -206,8 +207,8 @@ static void *get_source_mapping(struct config c)
> * requested alignment of 2MB. This is done to reduce coincidental
> * alignment in the tests.
> */
> - if (((unsigned long long) src_addr & (c.src_alignment - 1)) ||
> - !((unsigned long long) src_addr & c.src_alignment)) {
> + if (((unsigned long long)(uintptr_t)src_addr & (c.src_alignment - 1)) ||
> + !((unsigned long long)(uintptr_t)src_addr & c.src_alignment)) {
> munmap(src_addr, c.region_size);
> goto retry;
> }
> @@ -996,15 +997,15 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
> align_mask = ~(c.dest_alignment - 1);
> /* Offset of destination address from the end of the source region */
> offset = (c.overlapping) ? -c.dest_alignment : c.dest_alignment;
> - addr = (void *) (((unsigned long long) src_addr + c.region_size
> + addr = (void *)(uintptr_t)(((unsigned long long)(uintptr_t)src_addr + c.region_size
> + offset) & align_mask);
>
> /* Remap after the destination block preamble. */
> addr += c.dest_preamble_size;
>
> /* See comment in get_source_mapping() */
> - if (!((unsigned long long) addr & c.dest_alignment))
> - addr = (void *) ((unsigned long long) addr | c.dest_alignment);
> + if (!((unsigned long long)(uintptr_t)addr & c.dest_alignment))
> + addr = (void *)(uintptr_t)((unsigned long long)(uintptr_t)addr | c.dest_alignment);
>
> /* Don't destroy existing mappings unless expected to overlap. */
> while (!is_remap_region_valid(addr - c.dest_preamble_size,
> diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c
> index a76851aced4d0..4188991fab245 100644
> --- a/tools/testing/selftests/mm/uffd-common.c
> +++ b/tools/testing/selftests/mm/uffd-common.c
> @@ -488,7 +488,7 @@ void uffd_handle_page_fault(uffd_global_test_opts_t *gopts, struct uffd_msg *msg
> */
>
> area = (uint8_t *)(gopts->area_dst +
> - ((char *)msg->arg.pagefault.address -
> + ((char *)(uintptr_t)msg->arg.pagefault.address -
> gopts->area_dst_alias));
> for (b = 0; b < gopts->page_size; ++b)
> area[b] = ~area[b];
> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c
> index 2a97ba1d6feb1..2e4d1742f340b 100644
> --- a/tools/testing/selftests/mm/uffd-unit-tests.c
> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c
> @@ -341,17 +341,17 @@ static void uffd_wp_unpopulated_test(uffd_global_test_opts_t *gopts, uffd_test_a
> pagemap_fd = pagemap_open();
>
> /* Test applying pte marker to anon unpopulated */
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, true);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, true);
> value = pagemap_get_entry(pagemap_fd, gopts->area_dst);
> pagemap_check_wp(value, true);
>
> /* Test unprotect on anon pte marker */
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, false);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, false);
> value = pagemap_get_entry(pagemap_fd, gopts->area_dst);
> pagemap_check_wp(value, false);
>
> /* Test zap on anon marker */
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, true);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, true);
> if (madvise(gopts->area_dst, gopts->page_size, MADV_DONTNEED))
> err("madvise(MADV_DONTNEED) failed");
> value = pagemap_get_entry(pagemap_fd, gopts->area_dst);
> @@ -366,7 +366,7 @@ static void uffd_wp_unpopulated_test(uffd_global_test_opts_t *gopts, uffd_test_a
> err("madvise(MADV_DONTNEED) failed");
>
> /* Test read-zero-page upon pte marker */
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, true);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, true);
> *(volatile char *)gopts->area_dst;
> /* Drop it to make pte none again */
> if (madvise(gopts->area_dst, gopts->page_size, MADV_DONTNEED))
> @@ -389,7 +389,7 @@ static void uffd_wp_fork_test_common(uffd_global_test_opts_t *gopts, uffd_test_a
>
> /* Touch the page */
> *gopts->area_dst = 1;
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, true);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, true);
> value = pagemap_get_entry(pagemap_fd, gopts->area_dst);
> pagemap_check_wp(value, true);
> if (pagemap_test_fork(gopts, with_event, false)) {
> @@ -430,7 +430,7 @@ static void uffd_wp_fork_test_common(uffd_global_test_opts_t *gopts, uffd_test_a
> }
>
> /* Unprotect; this tests swap pte modifications */
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, false);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, false);
> value = pagemap_get_entry(pagemap_fd, gopts->area_dst);
> pagemap_check_wp(value, false);
>
> @@ -469,7 +469,7 @@ static void uffd_wp_fork_pin_test_common(uffd_global_test_opts_t *gopts,
>
> /* Touch the page */
> *gopts->area_dst = 1;
> - wp_range(gopts->uffd, (uint64_t)gopts->area_dst, gopts->page_size, true);
> + wp_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, gopts->page_size, true);
>
> /*
> * 1. First pin, then fork(). This tests fork() special path when
> @@ -675,7 +675,7 @@ static void uffd_rwp_async_test(uffd_global_test_opts_t *gopts,
> err("register failure");
>
> /* RW-protect all pages (sets protnone) */
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> /* Access all pages — should auto-resolve, no faults */
> @@ -739,7 +739,7 @@ static void uffd_rwp_sync_test(uffd_global_test_opts_t *gopts,
> err("register failure");
>
> /* RW-protect all pages */
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> /* Start fault handler thread */
> @@ -816,7 +816,7 @@ static void uffd_rwp_pagemap_test(uffd_global_test_opts_t *gopts,
> nr_pages * page_size))
> err("register failure");
>
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> /* Touch first half of pages to re-activate them (async auto-resolve) */
> @@ -825,7 +825,7 @@ static void uffd_rwp_pagemap_test(uffd_global_test_opts_t *gopts,
> (void)*page;
> }
>
> - uint64_t start = (uint64_t)gopts->area_dst;
> + uint64_t start = (uint64_t)(uintptr_t)gopts->area_dst;
> uint64_t boundary = start + (nr_pages / 2) * page_size;
> uint64_t end = start + nr_pages * page_size;
>
> @@ -844,7 +844,7 @@ static void uffd_rwp_pagemap_test(uffd_global_test_opts_t *gopts,
> pm_arg.size = sizeof(pm_arg);
> pm_arg.start = start;
> pm_arg.end = end;
> - pm_arg.vec = (uint64_t)regions;
> + pm_arg.vec = (uint64_t)(uintptr_t)regions;
> pm_arg.vec_len = ARRAY_SIZE(regions);
> pm_arg.category_mask = PAGE_IS_ACCESSED;
> pm_arg.return_mask = PAGE_IS_ACCESSED;
> @@ -897,7 +897,7 @@ static void uffd_rwp_mprotect_test(uffd_global_test_opts_t *gopts,
> if (uffd_register_rwp(gopts->uffd, gopts->area_dst,
> nr_pages * page_size))
> err("register failure");
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> /* Round-trip mprotect(): PROT_NONE -> PROT_READ|PROT_WRITE */
> @@ -937,9 +937,9 @@ static void uffd_rwp_mprotect_test(uffd_global_test_opts_t *gopts,
>
> memset(&pm_arg, 0, sizeof(pm_arg));
> pm_arg.size = sizeof(pm_arg);
> - pm_arg.start = (uint64_t)gopts->area_dst;
> - pm_arg.end = (uint64_t)gopts->area_dst + nr_pages * page_size;
> - pm_arg.vec = (uint64_t)regions;
> + pm_arg.start = (uint64_t)(uintptr_t)gopts->area_dst;
> + pm_arg.end = (uint64_t)(uintptr_t)gopts->area_dst + nr_pages * page_size;
> + pm_arg.vec = (uint64_t)(uintptr_t)regions;
> pm_arg.vec_len = ARRAY_SIZE(regions);
> pm_arg.category_mask = PAGE_IS_ACCESSED;
> pm_arg.category_inverted = PAGE_IS_ACCESSED;
> @@ -982,7 +982,7 @@ static void uffd_rwp_gup_test(uffd_global_test_opts_t *gopts,
> if (uffd_register_rwp(gopts->uffd, gopts->area_dst, gopts->page_size))
> err("register failure");
>
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> gopts->page_size, true);
>
> if (pipe(pipefd))
> @@ -1045,7 +1045,7 @@ static void uffd_rwp_async_toggle_test(uffd_global_test_opts_t *gopts,
> err("register failure");
>
> /* Phase 1: async detection — RW-protect, access first half */
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> for (p = 0; p < nr_pages / 2; p++) {
> @@ -1092,7 +1092,7 @@ static void uffd_rwp_async_toggle_test(uffd_global_test_opts_t *gopts,
> set_async_mode(gopts->uffd, true);
>
> /* RW-protect and access again — should auto-resolve */
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> for (p = 0; p < nr_pages; p++) {
> @@ -1127,7 +1127,7 @@ static void uffd_rwp_close_test(uffd_global_test_opts_t *gopts,
> nr_pages * page_size))
> err("register failure");
>
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> nr_pages * page_size, true);
>
> /* Close uffd — should restore protnone PTEs */
> @@ -1169,7 +1169,7 @@ static void uffd_rwp_fork_test(uffd_global_test_opts_t *gopts,
>
> /* Populate + RWP-protect */
> *gopts->area_dst = 1;
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst,
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst,
> page_size, true);
>
> /* Parent: verify uffd-wp bit is set before fork */
> @@ -1223,7 +1223,7 @@ static void uffd_rwp_fork_pin_test(uffd_global_test_opts_t *gopts,
> }
>
> /* RWP-protect: PTE is now PAGE_NONE + uffd bit. */
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst, page_size, true);
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, page_size, true);
>
> pagemap_fd = pagemap_open();
> value = pagemap_get_entry(pagemap_fd, gopts->area_dst);
> @@ -1332,7 +1332,7 @@ static void uffd_rwp_swap_cow_test(uffd_global_test_opts_t *gopts,
> *gopts->area_dst = 0x11;
>
> /* RWP-protect: PTE becomes PAGE_NONE + uffd bit (still exclusive). */
> - rwprotect_range(gopts->uffd, (uint64_t)gopts->area_dst, page_size, true);
> + rwprotect_range(gopts->uffd, (uint64_t)(uintptr_t)gopts->area_dst, page_size, true);
>
> /*
> * Swap the page out while it is still exclusive: a shared (forked)
> @@ -1498,7 +1498,7 @@ static int faulting_process(uffd_global_test_opts_t *gopts, int signal_test, boo
> /* This is a WP request */
> assert(steps == 2);
> wp_range(gopts->uffd,
> - (__u64)gopts->area_dst +
> + (__u64)(uintptr_t)gopts->area_dst +
> offset,
> gopts->page_size, false);
> }
> --
> 2.53.0
>
--
Cheers, Lorenzo
prev parent reply other threads:[~2026-11-03 17:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 16:39 Sasha Levin
2026-11-03 17:13 ` Lorenzo Stoakes (ARM) [this message]
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