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samples, bpf: Suppress compiler warning 

While cross compiling on ARM32 , the casting from pointer to __u64 will
cause warnings:

samples/bpf/task_fd_query_user.c: In function 'main':
samples/bpf/task_fd_query_user.c:399:23: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
399 | uprobe_file_offset = (__u64)main - (__u64)&__executable_start;
| ^
samples/bpf/task_fd_query_user.c:399:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
399 | uprobe_file_offset = (__u64)main - (__u64)&__executable_start;

Workaround this by using "unsigned long" to adapt to different ARCHs.

Signed-off-by: Hailong Liu <liu.hailong6@zte.com.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210511140429.89426-1-liuhailongg6@163.com
This commit is contained in:
Hailong Liu 2021-05-11 22:04:29 +08:00 committed by Andrii Nakryiko
parent e5670fa029
commit 0303ce1734
1 changed files with 1 additions and 1 deletions
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2
samples/bpf/task_fd_query_user.c
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@ -396,7 +396,7 @@ int main(int argc, char **argv)
* on different systems with different compilers. The right way is
* to parse the ELF file. We took a shortcut here.
*/
uprobe_file_offset = (__u64)main - (__u64)&__executable_start;
uprobe_file_offset = (unsigned long)main - (unsigned long)&__executable_start;
CHECK_AND_RET(test_nondebug_fs_probe("uprobe", (char *)argv[0],
uprobe_file_offset, 0x0, false,
BPF_FD_TYPE_UPROBE,