linux-kernel - Re: linux-next: build failure after merge of the ext4 tree

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Message-ID: <3738cc55-f3fd-4b6c-b1dd-3f469c00b9f1@huawei.com>
Date: Tue, 15 Jul 2025 11:31:50 +0800
From: Zhang Yi <yi.zhang@...wei.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>, Theodore Ts'o <tytso@....edu>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux Next
 Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the ext4 tree

On 2025/7/15 6:22, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the ext4 tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:

Hi Stephen!

I'm sorry for the regression, but I cannot reproduce this error
on my machine, could you please try this patch?

https://lore.kernel.org/linux-ext4/20250715031203.2966086-1-yi.zhang@huaweicloud.com/

Thanks,
Yi.

> 
> In file included from <command-line>:
> fs/ext4/inode.c: In function 'ext4_set_inode_mapping_order':
> include/linux/compiler_types.h:568:45: error: call to '__compiletime_assert_652' declared with attribute error: min(({ __auto_type __UNIQUE_ID_x_647 = (((0 ? 4 : 6) * 2 - 1)); __auto_type __UNIQUE_ID_y_648 = (((16 + __pte_index_size)-16)); do { __attribute__((__noreturn__)) extern void __compiletime_assert_649(void) __attribute__((__error__("min""(""((0 ? 4 : 6) * 2 - 1)"", ""((16 + __pte_index_size)-16)"") signedness error"))); if (!(!(!(((((typeof(__UNIQUE_ID_x_647))(-1)) < ( typeof(__UNIQUE_ID_x_647))1) ? (2 + (__builtin_constant_p((long long)(__UNIQUE_ID_x_647) >= 0) && ((long long)(__UNIQUE_ID_x_647) >= 0))) : (1 + 2 * (sizeof(__UNIQUE_ID_x_647) < 4))) & ((((typeof(__UNIQUE_ID_y_648))(-1)) < ( typeof(__UNIQUE_ID_y_648))1) ? (2 + (__builtin_constant_p((long long)(__UNIQUE_ID_y_648) >= 0) && ((long long)(__UNIQUE_ID_y_648) >= 0))) : (1 + 2 * (sizeof(__UNIQUE_ID_y_648) < 4))))))) __compiletime_assert_649(); } while (0); ((__UNIQUE_ID_x_647) < (__UNIQUE_ID_y_648) ? (__UNIQUE_ID_x_647) : (__UNIQUE_ID_y_648)); }), (11 + (inode)->i_blkbits - 16)) signedness error
>   568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |                                             ^
> include/linux/compiler_types.h:549:25: note: in definition of macro '__compiletime_assert'
>   549 |                         prefix ## suffix();                             \
>       |                         ^~~~~~
> include/linux/compiler_types.h:568:9: note: in expansion of macro '_compiletime_assert'
>   568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |         ^~~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>    39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>       |                                     ^~~~~~~~~~~~~~~~~~
> include/linux/minmax.h:93:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>    93 |         BUILD_BUG_ON_MSG(!__types_ok(ux, uy),           \
>       |         ^~~~~~~~~~~~~~~~
> include/linux/minmax.h:98:9: note: in expansion of macro '__careful_cmp_once'
>    98 |         __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
>       |         ^~~~~~~~~~~~~~~~~~
> include/linux/minmax.h:105:25: note: in expansion of macro '__careful_cmp'
>   105 | #define min(x, y)       __careful_cmp(min, x, y)
>       |                         ^~~~~~~~~~~~~
> fs/ext4/inode.c:5204:17: note: in expansion of macro 'min'
>  5204 |                 min(MAX_PAGECACHE_ORDER, (11 + (i)->i_blkbits - PAGE_SHIFT))
>       |                 ^~~
> fs/ext4/inode.c:5211:39: note: in expansion of macro 'EXT4_MAX_PAGECACHE_ORDER'
>  5211 |                                       EXT4_MAX_PAGECACHE_ORDER(inode));
>       |                                       ^~~~~~~~~~~~~~~~~~~~~~~~
> 
> Caused by commit
> 
>   e14bef2a00b5 ("ext4: limit the maximum folio order")
> 
> I have used the ext4 tree from next-20250714 for today.
>