This is a note to let you know that I've just added the patch titled ARM: 9142/1: kasan: work around LPAE build warning to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm-9142-1-kasan-work-around-lpae-build-warning.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 45d78733b9fa4ae63771128537f4df0d3a1e83f3 Author: Arnd Bergmann <arnd@xxxxxxxx> Date: Mon Oct 18 15:30:38 2021 +0100 ARM: 9142/1: kasan: work around LPAE build warning [ Upstream commit c2e6df3eaaf120cde5e7c3a70590dd82e427458a ] pgd_page_vaddr() returns an 'unsigned long' address, causing a warning with the memcpy() call in kasan_init(): arch/arm/mm/kasan_init.c: In function 'kasan_init': include/asm-generic/pgtable-nop4d.h:44:50: error: passing argument 2 of '__memcpy' makes pointer from integer without a cast [-Werror=int-conversion] 44 | #define pgd_page_vaddr(pgd) ((unsigned long)(p4d_pgtable((p4d_t){ pgd }))) | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | long unsigned int arch/arm/include/asm/string.h:58:45: note: in definition of macro 'memcpy' 58 | #define memcpy(dst, src, len) __memcpy(dst, src, len) | ^~~ arch/arm/mm/kasan_init.c:229:16: note: in expansion of macro 'pgd_page_vaddr' 229 | pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_START)), | ^~~~~~~~~~~~~~ arch/arm/include/asm/string.h:21:47: note: expected 'const void *' but argument is of type 'long unsigned int' 21 | extern void *__memcpy(void *dest, const void *src, __kernel_size_t n); | ~~~~~~~~~~~~^~~ Avoid this by adding an explicit typecast. Link: https://lore.kernel.org/all/CACRpkdb3DMvof3-xdtss0Pc6KM36pJA-iy=WhvtNVnsDpeJ24Q@xxxxxxxxxxxxxx/ Fixes: 5615f69bc209 ("ARM: 9016/2: Initialize the mapping of KASan shadow memory") Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c index 9c348042a7244..4b1619584b23c 100644 --- a/arch/arm/mm/kasan_init.c +++ b/arch/arm/mm/kasan_init.c @@ -226,7 +226,7 @@ void __init kasan_init(void) BUILD_BUG_ON(pgd_index(KASAN_SHADOW_START) != pgd_index(KASAN_SHADOW_END)); memcpy(tmp_pmd_table, - pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_START)), + (void*)pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_START)), sizeof(tmp_pmd_table)); set_pgd(&tmp_pgd_table[pgd_index(KASAN_SHADOW_START)], __pgd(__pa(tmp_pmd_table) | PMD_TYPE_TABLE | L_PGD_SWAPPER));