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ARM: 9142/1: kasan: work around LPAE build warning

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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@mail.gmail.com/

Fixes: 5615f69bc2 ("ARM: 9016/2: Initialize the mapping of KASan shadow memory")
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Arnd Bergmann 2021-10-18 15:30:38 +01:00 committed by Russell King (Oracle)
parent 336fe1d6c2
commit c2e6df3eaa
1 changed files with 1 additions and 1 deletions
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2
arch/arm/mm/kasan_init.c
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@ -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));