linux-next: build warning after merge of the tip tree

Stephen Rothwell
2020-12-14T05:49:37Z

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Hi all,

After merging the tip tree, today's linux-next build (arm
multi_v7_defconfig) produced this warning:

In file included from include/linux/kernel.h:14,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from include/linux/proc_fs.h:10,
from include/linux/efi.h:19,
from drivers/firmware/efi/libstub/arm32-stub.c:5:
drivers/firmware/efi/libstub/arm32-stub.c: In function 'handle_kernel_image':
include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
18 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
| ^~
include/linux/minmax.h:32:4: note: in expansion of macro '__typecheck'
32 | (__typecheck(x, y) && __no_side_effects(x, y))
| ^~~~~~~~~~~
include/linux/minmax.h:42:24: note: in expansion of macro '__safe_cmp'
42 | __builtin_choose_expr(__safe_cmp(x, y), \
| ^~~~~~~~~~
include/linux/minmax.h:58:19: note: in expansion of macro '__careful_cmp'
58 | #define max(x, y) __careful_cmp(x, y, >)
| ^~~~~~~~~~~~~
arch/arm/include/asm/efi.h:74:25: note: in expansion of macro 'max'
74 | #define EFI_PHYS_ALIGN max(SZ_2M, roundup_pow_of_two(TEXT_OFFSET))
| ^~~
drivers/firmware/efi/libstub/arm32-stub.c:123:44: note: in expansion of macro 'EFI_PHYS_ALIGN'
123 | int alloc_size = MAX_UNCOMP_KERNEL_SIZE + EFI_PHYS_ALIGN;
| ^~~~~~~~~~~~~~
include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
18 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
| ^~
include/linux/minmax.h:32:4: note: in expansion of macro '__typecheck'
32 | (__typecheck(x, y) && __no_side_effects(x, y))
| ^~~~~~~~~~~
include/linux/minmax.h:42:24: note: in expansion of macro '__safe_cmp'
42 | __builtin_choose_expr(__safe_cmp(x, y), \
| ^~~~~~~~~~
include/linux/minmax.h:58:19: note: in expansion of macro '__careful_cmp'
58 | #define max(x, y) __careful_cmp(x, y, >)
| ^~~~~~~~~~~~~
arch/arm/include/asm/efi.h:74:25: note: in expansion of macro 'max'
74 | #define EFI_PHYS_ALIGN max(SZ_2M, roundup_pow_of_two(TEXT_OFFSET))
| ^~~
drivers/firmware/efi/libstub/arm32-stub.c:139:20: note: in expansion of macro 'EFI_PHYS_ALIGN'
139 | if ((alloc_base % EFI_PHYS_ALIGN) > slack) {
| ^~~~~~~~~~~~~~
In file included from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from include/linux/proc_fs.h:10,
from include/linux/efi.h:19,
from drivers/firmware/efi/libstub/arm32-stub.c:5:
include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
18 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
| ^~
include/linux/kernel.h:63:46: note: in definition of macro '__round_mask'
63 | #define __round_mask(x, y) ((__typeof__(x))((y)-1))
| ^
drivers/firmware/efi/libstub/arm32-stub.c:144:17: note: in expansion of macro 'round_up'
144 | kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN);
| ^~~~~~~~
include/linux/minmax.h:32:4: note: in expansion of macro '__typecheck'
32 | (__typecheck(x, y) && __no_side_effects(x, y))
| ^~~~~~~~~~~
include/linux/minmax.h:42:24: note: in expansion of macro '__safe_cmp'
42 | __builtin_choose_expr(__safe_cmp(x, y), \
| ^~~~~~~~~~
include/linux/minmax.h:58:19: note: in expansion of macro '__careful_cmp'
58 | #define max(x, y) __careful_cmp(x, y, >)
| ^~~~~~~~~~~~~
arch/arm/include/asm/efi.h:74:25: note: in expansion of macro 'max'
74 | #define EFI_PHYS_ALIGN max(SZ_2M, roundup_pow_of_two(TEXT_OFFSET))
| ^~~
drivers/firmware/efi/libstub/arm32-stub.c:144:38: note: in expansion of macro 'EFI_PHYS_ALIGN'
144 | kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN);
| ^~~~~~~~~~~~~~
include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
18 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
| ^~
include/linux/kernel.h:63:46: note: in definition of macro '__round_mask'
63 | #define __round_mask(x, y) ((__typeof__(x))((y)-1))
| ^
drivers/firmware/efi/libstub/arm32-stub.c:148:17: note: in expansion of macro 'round_down'
148 | kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN);
| ^~~~~~~~~~
include/linux/minmax.h:32:4: note: in expansion of macro '__typecheck'
32 | (__typecheck(x, y) && __no_side_effects(x, y))
| ^~~~~~~~~~~
include/linux/minmax.h:42:24: note: in expansion of macro '__safe_cmp'
42 | __builtin_choose_expr(__safe_cmp(x, y), \
| ^~~~~~~~~~
include/linux/minmax.h:58:19: note: in expansion of macro '__careful_cmp'
58 | #define max(x, y) __careful_cmp(x, y, >)
| ^~~~~~~~~~~~~
arch/arm/include/asm/efi.h:74:25: note: in expansion of macro 'max'
74 | #define EFI_PHYS_ALIGN max(SZ_2M, roundup_pow_of_two(TEXT_OFFSET))
| ^~~
drivers/firmware/efi/libstub/arm32-stub.c:148:40: note: in expansion of macro 'EFI_PHYS_ALIGN'
148 | kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN);
| ^~~~~~~~~~~~~~

Introduced by commit

c0249238feef ("efi: arm: reduce minimum alignment of uncompressed kernel")

--
Cheers,
Stephen Rothwell

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